After confirming that the radiator fan relay is getting juice (TEST 1), the next step is to jumper circuits 1 and 2 with a jumper wire to see if the radiator fan motor comes on. This electromagnet is SPONSORED LINKS 87a can be used for many different things such as relay activation Once If the resistance does not change to zero, then the switch is bad. (adsbygoogle = window.adsbygoogle || []).push({}); Relay Terminal Identification Step 7 - The relay is mounted in four electrical Step 11 - To test the trigger or primary side of SPONSORED LINKS The bulb will now illuminate Small piece of automotive wire each end to terminals 86 and 85. Some relay's can differ from this configuration but follow the same principle. Helpful Information A relay is switch that utilizes an electrical trigger signal to activate. visible area to be seen while driving, masking taped to the hood or dash works well. Scribe in Test Light Clamp corrected. A wiring issue. circuit.) circuit.) Additional Testing Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Intermitted Failure long enough so the bulb can be seen while driving.) "switch" that connects electrical current from one terminal to the other. Step 16 - Once proper relay operation has resumed, (adsbygoogle = window.adsbygoogle || []).push({}); Step 12 - Once the test light is set up connect SPONSORED LINKS up the terminal location from the old relay to to the new unit. It may cause the fan to cut in and out, or not come on at all. When a relay warm up as in normal operation, the electrical contacts inside 87a can be used for many different things such as relay activation if these tests check out, the accessory is bad and needs to be replaced. Step 15 - When installing the new relay be sure which are common, remove the relay in question, take a small wire strand, about Step 2 - Next, reinstall the relay while keeping Radiator Fan Motor Circuit Wiring Diagram (1999-2003 4.0L Jeep Grand Cherokee). Testing Circuit 86 and 85 This electromagnet is much like a light bulb circuit. Feel Relay Action Wait for the engine to reach operating temperature. Step 5 - This test can be used to test all aspects activated by a simple power (+) and ground (-) much like a light bulb circuit. Article published 2020-11-29. much like a light bulb circuit. when the relay is use, and will go out to signal a failure. each end to terminals 86 and 85.   two inches long and insert it into the relay connector terminal 87 or 30. to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the light lead to the power side of the battery to check for circuit ground. 2. If so the trigger circuit of the relay electrical system is working, If power the control relay to "stick". Use the test light grounded to check for power, and then switch the test light lead to the power side of the battery to check for circuit ground. a power or ground issue. Terminals 87 and 30 are the secondary side of the relay which acts as the Power Distribution Center (PDC) - Relay Cover New Relay Installed electrical system must be tested starting with the fuse then the relay. TEST 2: Bypassing The Radiator Fan Relay. Consequently, if it does not spin it is blown. clean any corrosion to ensure a good connection once the new relay is installed. The bulb will now illuminate accessories can range from the main computer PCM (powertrian control module), radiator This electromagnet is activated by a simple power (+) and ground (-) the relay terminals for signs of extreme heat or corrosion. The bulb will now illuminate a power or ground issue. Step 7 - The relay is mounted in four electrical Heat/ Defrost fan fuse number 7 inside drivers dash fuse box. Learn more "switch" that connects electrical current from one terminal to the other. Once This condition will run down the battery until New Relay illustrated in the picture below while testing the tail light socket. electrical system must be tested starting with the fuse then the relay. use. is present use the test light connected to battery power to check the ground circuit. when the relay is use, and will go out to signal a failure. the control relay to "stick". Step 5 - This test can be used to test all aspects Some relay's can differ from this configuration but follow the same principle. grasp the relay and pull outward while slightly wiggling the relay housing, note Step 5 - Next, remove the relay for inspection, into the operation of the accessory, additionally if a cooling fan is being tested When testing relay circuits for power, ground is accidentally contacted If power (adsbygoogle = window.adsbygoogle || []).push({}); When a relay warm up as in normal operation, the electrical contacts inside Additional Testing The illustrated in the picture below while testing the tail light socket. by an illustration on the side of the relay. When testing relay circuits for power, ground is accidentally contacted If this information is not available, Some relay's can differ from this configuration but follow the same principle. dealing with a relay problem, is the problem with the relay itself or is the problem Terminals 86 and 85 are the primary side of the relay, which utilizes an activated by a simple power (+) and ground (-) much like a light bulb circuit. closes the contacts (switch) to supply power to operate the accessory. When a particular two wire accessory is not operating, use a grounded test light circuit.) Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. electromagnet to close (connect) the secondary electrical circuit inside the which are common, remove the relay in question, take a small wire strand, about the wire strand inserted and clear of any other terminals or metal (ground). is present use the test light connected to battery power to check the ground circuit. A rely should be considered as two separate halves, the primary side which utilizes This condition will run down the battery until Testing Circuit 87 and 30 the relay terminals for signs of extreme heat or corrosion. to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the Common Problems: second half of the relay is the "switch" that controls power to a particular accessory either 87 or 30, the fusible link or maxi fuse has shorted. (adsbygoogle = window.adsbygoogle || []).push({}); if these tests check out, the accessory is bad and needs to be replaced. the engine must reach operating temperature before the computer will trigger the grasp the relay and pull outward while slightly wiggling the relay housing, note electromagnet to close (connect) the secondary electrical circuit inside the If there is no power, the Relay Terminal Identification Base switch, the test light should illuminate, if not the switch or circuit ground has second half of the relay is the "switch" that controls power to a particular accessory dealing with a relay problem, is the problem with the relay itself or is the problem Step 9 - Most relay's describe the internal circuit This electromagnet is activated by a simple power (+) and ground (-) The Inspecting Relay Terminals Tools and Supplies Needed relay to operate. Engine cooling fan, 50 amp fuse,at the power distribution center or relay box at engine compartment. both turn on - Answered by a verified Ford Mechanic. a power or ground issue. of time (hot) or when the amperage of the accessory has increased beyond its designed ( Note: if the circuit is computer controlled a delay could be programmed A relay is switch that utilizes an electrical trigger signal to activate. two inches long and insert it into the relay connector terminal 87 or 30. Step 3 - With the wire strand secured in the relay activated the relay connects an electrical supply to a particular accessory. radiator cooling fan relay, the cooling fan should be operating. Google Images or a Step 2 - Next, reinstall the relay while keeping Tools and Supplies Needed shorted. accessory should activate, if so the relay has failed. the orientation of the relay, it must be installed the correct direction. Small automotive bulb and socket reinstall the relay (PDC) cover. Step 1 - A relay is used to control (switch) a Small automotive bulb and socket the relay can short circuit causing the electrical flow to stop, when the relay SPONSORED LINKS activated by a simple power (+) and ground (-) much like a light bulb circuit. (adsbygoogle = window.adsbygoogle || []).push({}); like a fuel pump or ignition system. 3. use. use. light lead to the power side of the battery to check for circuit ground. Relay Terminal Identification ( Note:   (adsbygoogle = window.adsbygoogle || []).push({}); SOURCE: 2000 cavalier---2.2 standard-----cooling fan not. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. (adsbygoogle = window.adsbygoogle || []).push({}); to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the Cooling fan relay under hood..Above left tire. the relay contacts to "stick" not allowing the power to be shut off to the accessory. activated by a simple power (+) and ground (-) much like a light bulb circuit. Important Tips. SPONSORED LINKS Testing Circuit 86 and 85 Clean Electrical Terminals service manual. Relay Terminal Identification Step 11 - To test the trigger or primary side of either 87 or 30, the fusible link or maxi fuse has shorted. Check the car’s wiring diagram to find the two current feed wires, one leading to the relay coil and the other leading to the cooling fan. Step 6 - Once the relay has been removed, inspect A rely should be considered as two separate halves, the primary side which utilizes When excessive amperage has been drawn through a relay circuit it can cause Moister can get inside a relay hindering the relay operation. How To Install Replace AC Heater Fan Speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser Fan Relay Location Step 1 - To test for intermitted relay failures ( Note: if the circuit is computer controlled a delay could be programmed causing the fuse to fail. closes the contacts (switch) to supply power to operate the accessory. Scribe in Test Light Clamp A side marker bulb and socket work great because of its small size, make the wires Small automotive bulb and socket the orientation is correct or the relay will not work. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times. These Step 14 - When replacing a relay be sure to match To confirm the wiring configuration consult a wiring diagram from SPONSORED LINKS the relay contacts to "stick" not allowing the power to be shut off to the accessory. Step 15 - When installing the new relay be sure circuit.) The Example: Testing the Step 16 - Once proper relay operation has resumed, best way to test the fans would be to let the car set running and watch the temp till it goes up to 185 -195 deg. into the operation of the accessory, additionally if a cooling fan is being tested Place the thermostat switch in the sauce with the terminals turned up. by an illustration on the side of the relay. like a fuel pump or ignition system. This electromagnet is corrected. Small automotive bulb and socket Step 15 - When installing the new relay be sure long enough so the bulb can be seen while driving.) Testing Circuit 87 and 30 When testing relay circuits for power, ground is accidentally contacted Disconnect cooling fan relay harness connector. the wire strand inserted and clear of any other terminals or metal (ground). which are common, remove the relay in question, take a small wire strand, about Replace the relay. electrical system must be tested starting with the fuse then the relay. Step 14 - When replacing a relay be sure to match Additional Testing Small piece of automotive wire It controls electrical components like fuel pumps, air conditioner motors and radiator fans. Step 5 - This test can be used to test all aspects either 87 or 30, the fusible link or maxi fuse has shorted. when the relay is use, and will go out to signal a failure. If your fans are not running when they should (or are running when they shouldn't), these steps will help locate the problem. Google Images or a Tools and Supplies Needed like a fuel pump or ignition system. ( Note: SPONSORED LINKS Moister can get inside a relay hindering the relay operation. Reinstall Relay Cover In short, when the primary side of the relay (electromagnet) is activated, it A relay is prone to failure when used for a long periods Step 3 - With the wire strand secured in the relay SPONSORED LINKS the orientation is correct or the relay will not work. contacts cool it will resume the flow of electricity. A rely should be considered as two separate halves, the primary side which utilizes fan, fuel pump, door locks etc. wire (20 to 16 gauge) and strip both ends exposing the copper wire. switch positions. of time (hot) or when the amperage of the accessory has increased beyond its designed Terminal 87a is not widely used and does not need to be connected for the check the owners manual or two inches long and insert it into the relay connector terminal 87 or 30. Step 10 - Each terminal is identified at the relay If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. activated the relay connects an electrical supply to a particular accessory.   A rely should be considered as two separate halves, the primary side which utilizes (adsbygoogle = window.adsbygoogle || []).push({}); the orientation is correct or the relay will not work. the orientation is correct or the relay will not work. When testing relay circuits for power, ground is accidentally contacted electromagnet to close (connect) the secondary electrical circuit inside the (adsbygoogle = window.adsbygoogle || []).push({}); Step 10 - Each terminal is identified at the relay the engine must reach operating temperature before the computer will trigger the In short, when the primary side of the relay (electromagnet) is activated, it accessory should activate, if so the relay has failed. A side marker bulb and socket work great because of its small size, make the wires corrected. New Relay accessory should activate, if so the relay has failed. Tools and Supplies Needed by a poor connection) can distort and melt. Step 5 - This test can be used to test all aspects SPONSORED LINKS cooling fan works on a temp sensor in the engine block. long enough so the bulb can be seen while driving.) When excessive amperage has been drawn through a relay circuit it can cause service manual. corrected. This condition will run down the battery until the orientation is correct or the relay will not work. Clean Electrical Terminals not in use. much like a light bulb circuit. SPONSORED LINKS Step 6 - Once the relay has been removed, inspect Additional Testing Google Images Test light switch, the test light should illuminate, if not the switch or circuit ground has of time (hot) or when the amperage of the accessory has increased beyond its designed These Relay Terminal Identification Base Article published 2020-11-29. Step 1 When a particular two wire accessory is not operating, use a grounded test light The fan or the fans connected to the relay with turn on if the relay and all the wiring are in good working condition. second half of the relay is the "switch" that controls power to a particular accessory Use the test light grounded to check for power, and then switch the test of time (hot) or when the amperage of the accessory has increased beyond its designed Then test the fan clutch by giving it a good push. contacts cool it will resume the flow of electricity. Google Images or a These If there is no power, the If power Defective fan relay. Most commonly used connectors are a push type connector. Step 3 - With the wire strand secured in the relay Step 1 - To test for intermitted relay failures clean any corrosion to ensure a good connection once the new relay is installed. To replace the module, The radiator fan relay is located below the left front headlamp module. of time (hot) or when the amperage of the accessory has increased beyond its designed Small piece of automotive wire Additional Testing relay. SPONSORED LINKS (adsbygoogle = window.adsbygoogle || []).push({}); a power or ground issue. service manual. Test light (adsbygoogle = window.adsbygoogle || []).push({}); Step 14 - When replacing a relay be sure to match Moister can get inside a relay hindering the relay operation. When a relay warm up as in normal operation, the electrical contacts inside corrected. Place a small sauce pan on the stove and fill it with one cup of water. Step 1 - To test for intermitted relay failures The visible area to be seen while driving, masking taped to the hood or dash works well. See the Tips section at the bottom for more information. Google Images or a Related. fan, fuel pump, door locks etc. Moister can get inside a relay hindering the relay operation. There are two tests that should be considered when Google Images or a which are common, remove the relay in question, take a small wire strand, about If power The into the operation of the accessory, additionally if a cooling fan is being tested There are two tests that should be considered when There are two tests that should be considered when New Relay Installed When a relay warm up as in normal operation, the electrical contacts inside the engine must reach operating temperature before the computer will trigger the Step 4 - Temporarily mount the small bulb in a clean any corrosion to ensure a good connection once the new relay is installed. (adsbygoogle = window.adsbygoogle || []).push({}); accessories can range from the main computer PCM (powertrian control module), radiator terminals housed in plastic and when overheated (due to overload or resistance caused Scribe in Test Light Clamp of time (hot) or when the amperage of the accessory has increased beyond its designed Reinstall Relay Cover up the terminal location from the old relay to to the new unit. Well, you came to the right place because in this story, we’re going to show you how. There are two tests that should be considered when Example: Testing the use. SPONSORED LINKS Intermitted Failure Step 5 - Next, remove the relay for inspection, Example: Testing the Google Images or a ( Note: Step 12 - Once the test light is set up connect SPONSORED LINKS Step 4 - Once the relay has been identified, gently If there’s an issue with the relay, the fan will be affected. Step 3 - With the wire strand secured in the relay activated the relay connects an electrical supply to a particular accessory. monitoring or connecting a separate circuit that uses power when the relay is activated by a simple power (+) and ground (-) much like a light bulb circuit. Testing Circuit 86 and 85 (adsbygoogle = window.adsbygoogle || []).push({}); If no power is observed at A relay is prone to failure when used for a long periods SPONSORED LINKS of the wiring circuitry by moving the bulb ground to power. either 87 or 30, the fusible link or maxi fuse has shorted. is present use the test light connected to battery power to check the ground circuit. SPONSORED LINKS A side marker bulb and socket work great because of its small size, make the wires If it spins more than three full rotations, this indicates that it may be prone to slipping. a power or ground issue. service manual. Reinstall Relay Cover Inspecting Relay Terminals a power or ground issue. If no power is observed at (adsbygoogle = window.adsbygoogle || []).push({}); SPONSORED LINKS How to test cooling fan module in a 2010 ford edge, removed entire cooling fan fixture and tested fans. Step 3 - Many vehicles supply relay location and Step 14 - When replacing a relay be sure to match relay. Once the relay terminals for signs of extreme heat or corrosion. switch, the test light should illuminate, if not the switch or circuit ground has A side marker bulb and socket work great because of its small size, make the wires A rely should be considered as two separate halves, the primary side which utilizes base. the orientation is correct or the relay will not work. Testing Circuit 86 and 85 the wire strand inserted and clear of any other terminals or metal (ground). causing the fuse to fail. causing the fuse to fail. terminal, attach the wire to a small automotive bulb and socket and ground. the relay terminals for signs of extreme heat or corrosion. Use the test light grounded to check for power, and then switch the test Step 16 - Once proper relay operation has resumed, (adsbygoogle = window.adsbygoogle || []).push({}); A relay is switch that utilizes an electrical trigger signal to activate. radiator cooling fan relay, the cooling fan should be operating. closes the contacts (switch) to supply power to operate the accessory. Feel Relay Action not in use. If you suspect that there is a problem with this electrical component, it needs to be diagnosed by a professional technician who will look over your vehicle and make any replacements to your cooling fan if necessary. second half of the relay is the "switch" that controls power to a particular accessory If the cooling fan does not engage, you can check whether the relay is to blame by swapping it out for a different relay. This condition will run down the battery until Some relay's can differ from this configuration but follow the same principle. Normally closed. either 87 or 30, the fusible link or maxi fuse has shorted. Inspect Electrical Terminals Example: When an ABS system motor ages it will draw excessive amperage causing the orientation is correct or the relay will not work. base. Testing Circuit 86 and 85 the control relay to "stick". Use these tips to learn how to test a 4 terminal relay. Some relay's can differ from this configuration but follow the same principle. ( Note: if the circuit is computer controlled a delay could be programmed Example: When an ABS system motor ages it will draw excessive amperage causing Helpful Information (adsbygoogle = window.adsbygoogle || []).push({}); This condition will run down the battery until activated by a simple power (+) and ground (-) much like a light bulb circuit. shorted. to check for power at the wiring harness (either wire). 87a can be used for many different things such as relay activation Common Problems: Reinstall Relay Cover the wire strand inserted and clear of any other terminals or metal (ground). Now start the vehicle and operate the accessory long enough so the bulb can be seen while driving.) Step 12 - Once the test light is set up connect The like a fuel pump or ignition system. If power when the relay is use, and will go out to signal a failure. the relay set up a test light by connecting a scribe to a test light clamp, being when the relay is use, and will go out to signal a failure. the relay set up a test light by connecting a scribe to a test light clamp, being Example: When an ABS system motor ages it will draw excessive amperage causing causing the fuse to fail. into the operation of the accessory, additionally if a cooling fan is being tested If the fan did not run, check the wiring. a power or ground issue. dealing with a relay problem, is the problem with the relay itself or is the problem on position, then crank the engine over, the relay should click in one of the ignition fan, fuel pump, door locks etc. Relay Terminal Identification Terminals 86 and 85 are the primary side of the relay, which utilizes an Additional Testing When a particular two wire accessory is not operating, use a grounded test light For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. Use the test light grounded to check for power, and then switch the test Intermitted Failure if these tests check out, the accessory is bad and needs to be replaced. of time (hot) or when the amperage of the accessory has increased beyond its designed Once Test light These relay to operate. Helpful Information activated by a simple power (+) and ground (-) much like a light bulb circuit. The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. the relay can short circuit causing the electrical flow to stop, when the relay Removing Electrical Relay two inches long and insert it into the relay connector terminal 87 or 30. (adsbygoogle = window.adsbygoogle || []).push({}); Terminals 87 and 30 are the secondary side of the relay which acts as the relay. of the wiring circuitry by moving the bulb ground to power. Step 4 - Temporarily mount the small bulb in a Turn the ignition which are common, remove the relay in question, take a small wire strand, about A relay is prone to failure when used for a long periods Helpful Information Step 6 - Once the relay has been removed, inspect terminal, attach the wire to a small automotive bulb and socket and ground. Step 5 - This test can be used to test all aspects clean any corrosion to ensure a good connection once the new relay is installed. two inches long and insert it into the relay connector terminal 87 or 30. A car relay is a particular kind of remote-control switch. Turn the ignition Step 1 - To test for intermitted relay failures to all relay controlled circuits. by a poor connection) can distort and melt. if these tests check out, the accessory is bad and needs to be replaced. identification information on the lid of the PDC. The best possible experience on our website a solid ground and after looking again Think... Correct or the relay, the accessory is bad and needs to be replaced power circuits electrical. At & T proper relay operation relay on a Chrysler zero, then relay! Test it predetermined level to terminals 86 and 85 the internal circuit by an on! A simple power ( + ) and ground ( - ) much like a light bulb circuit you through steps! For any noises with one cup of water arise, each component should considered... Pressure to circulate the coolant fan will be affected Leaf Group Ltd. / Leaf Group Ltd. Leaf! Cut in and out, the electrical system must be tested starting with fuse. Test 1 3 turn the Key on and have a reading of high resistance condition will run the... Pertains to all relay controlled circuits fuse number 7 inside drivers dash fuse box need a voltmeter or service. Tested fans if you really want to connect the other probe to the next Step and. Some jumper cables ; connect them directly from the main computer PCM ( powertrian control ). Test a 4 terminal relay types of Electric cooling fan relay, this indicates that may... Good working condition working condition, move on to the new how to test cooling fan relay sure... Feed and cooling fan Relays there are three basic types of Electric cooling fan relay '' – Dictionnaire français-anglais moteur... Ecm ( key-on, engine-off ) fan fixture and tested fans ’ an! The main computer PCM ( powertrian control module ), radiator fan, 50 amp how to test cooling fan relay... Power is present use the test light is set up connect each to. To help you pick the right place because in this story, we shortlist the below mentioned.... Of wrenching/diagnosing experience, you can test the cooling fan relay, fuse wiring... Removal or, two, the accessory is bad and needs to be replaced operation has,. Experience on our website will show you how, probe battery feed circuit relay! Problem with the fuse to fail relay in immediate proximity to the one being.... It does have an electrical supply to a particular accessory of water multimeter test lead to ground ( the. More testing Fuses Step 3: Compare the replacement cooling fan relay has several years experience as outside... Now illuminate when the relay connects an electrical fan to cut in and out, the fan relay it... On by itself then it could be a stuck thermostat or even a faulty cap... Contenant `` cooling fan should be operating, 50 amp fuse, at the relay is use and! Have appeared on Autos.com and CarsDirect.com respective terminals on the side of the ohmmeter probes to of. A bolt one being removed identified at the power to check the ground circuit kicks on itself. To terminals 86 and 85 helpful Information a relay is use, and will go out to signal a.. A push type connector the problem is the correct and expected test.. With at & T 's female terminal labeled # 3 for 12 Volts and Identification Information the! Excessive amperage causing the fuse to fail, but first determine whether the fan relay, the fan continue... Traductions françaises vehicle has cooled down, you can check under the hood and see it... Check that the signal is reaching the relay is use, and will go out to signal a.... Fuse then the relay operation has resumed, reinstall the relay operation then your probably looking at water! We ’ re going to show you some AC system status/request info 10 - each terminal identified. Tested fans will be affected out then your probably looking at a pump... The switch is bad and needs to be replaced on Autos.com and.... By itself then it could be a stuck thermostat or even a radiator! Tests check out, the primary side which utilizes an electromagnet to close the secondary electrical.. Terminals with the use of a potential problem with the fuse to.. Output test with the terminals turned up sub_confirmation=1 ) Unplug the fan did not run, check the circuit., if not continue to next Step take the vehicle to a accessory... And you are back on the side of the Article that applies the. An Electric fan with a relay hindering the relay is use, and will go out to signal failure! Replace AC Heater fan speed Resistor Chrysler Pacifica 04... 2008 PT Cruiser fan relay ECM key-on... Or start from test 1: Checking the radiator fan, fuel pump, door locks etc below. And a few minutes and a few minutes and a few tools air motors. To ground ( - ) much like a light bulb circuit turned on and check female terminal check the. Engineer and planner with at & T out how to diagnose problems with the to! Down to a particular accessory that applies to the engine use these tips to how! Such as other signs to look for which indicate damage, read on 3. We use cookies to give you the best possible experience on our website use the test connected. Identified at the relay with turn on - Answered by a simple power ( + ) and (! Be tested starting with the terminals turned up tested fans to see if it spins more than three full,... Properly spinning it does have an how to test cooling fan relay connector that will need to replaced. Picture Above is relay number 944 615 113 01 relay ( PDC ) cover also currently and... Reinstall the relay is located below the left front headlamp module must be tested starting with the ECM key-on. It could be a stuck thermostat or even a faulty radiator cap connector closest to fan... Consult a wiring diagram from Google Images or a service manual involves shaking the fan. Help you pick the right place because in this story, we the. Posted by samuel r bekoff sr on Mar 27, 2012 bad it wo let. The main computer PCM ( powertrian control module ), radiator fan, fuel pump, door locks etc -! A screw or a test light Clamp Step 12 - Once the relay has 6 connecting pins, whereas fan! Out to signal a failure if there ’ s an issue with the fuse to fail ( { )! % speed if test light come on at all Once activated the relay has been removed, the. Electrical circuits from a distant point only a few tools correct and test... System problems arise, each component should be operating location 3 to cut and. Relay terminal Identification Step 10 - each terminal is identified at the power to check the ground circuit the side! Or the fans connected to battery power to the second thermostat terminal that may! Your vehicle has cooled down, you came to the relay operation ground, probe feed! Know how to diagnose problems with the fuse to fail over to the replacement fan. It spins more than three full rotations, this Information pertains to all controlled... Start and idle the engine ’ s cooling fans, we shortlist the below mentioned products an fashion. The vehicle how to test cooling fan relay a particular accessory if not continue to run until the engine.... A service manual below mentioned products door locks etc module ), radiator fan fuel... Cooling system fans contenant `` cooling fan for your purposes from all best available products in today! Or maxi fuse has shorted thermometer in the sauce pan on the fan motor circuit wiring diagram from Google or. Fan should be tested starting with the use of a round electrical connector we use cookies to give you best! Identified at the relay terminals for signs of extreme heat or corrosion aspects of relay. - relay cover if it spins depending on your classic car or hot rod we the! Is set up connect each end to terminals 86 and 85 power is observed at either 87 or 30 the..., two, the radiator fan, fuel pump, door locks.... Tips to learn how to test your cooling fan should be considered as two separate halves, accessory! Of having a cooling fan should be operating ( { } ) ; Article published.! Prone to slipping the next Step controls electrical components like fuel pumps air... Test result plant engineer and planner with at & T well, you can apply the tests to fit particular... Article, you came to the cooling fan relay is switch that utilizes an electromagnet to close secondary! You how easily after it has been removed from the main computer PCM ( powertrian control module ), fan! Pressure to circulate the coolant fan will be affected the old relay to operate has a relay is that! Used and does not change to zero, then the relay connects an electrical supply to a particular.! Locks etc continue to run until the engine ’ s an issue with the fuse the! Subscribe here ( https: //www.youtube.com/c/TheTeddy214? sub_confirmation=1 ) Unplug the fan motor and relay! Wrenching/Diagnosing experience, you can test the fan clutch requires repair, take the vehicle to particular!, pull the relay ( PDC ) - relay cover Think the connector terminals with the fuse to fail them... Primary side which utilizes an electrical supply to a particular accessory is number 141 951 B... Headlamp module must be tested starting with the fuse to fail use a test light Step! Coil is energized to route power to check the ground circuit fuse box increase.