Conversely, when the … How Car Cooling Systems Work. This is the terminal that actuates the relay. It might be mechanical or electric, but the engine drives it. Remove the radiator cap from the radiator and look for any debris build up on the inside of the radiator. Yesterday, I changed my radiator fluid in my 2005 Buick Lasabre. When you say "Thermostat for the switch", do you mean a Temperature Sensor Switch of some type or Cooling Fan Switch that mounts on the engine or radiator. If the fan doesn't work with direct battery power, examine the terminal that plugs to the radiator fan connector. BUT it seems that this just burns up the rad fan switch leading to the fan never coming on. this is … If the fuses are intact, switch on the ignition and use a circuit tester to find if there is current at the motor terminals. The (PCM) will now detect a failed switch; store a Diagnostic Trouble Code (DTC) and turn on the fan(s). > > The quickest way to begin trouble shooting this system is to use the > Coolant Fan Test Connector located in the triangular shaped > relay/fuse box just behind the car battery. To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off depending on the temperature of the engine. Step 2: Inspect the inside of the radiator. NOTE: This tutorial on how to test the radiator fan motor complements this one: Radiator Fan Relay Test (2001-2005 1.7L Honda Civic). For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. The Radiator Fan Relay. If leakage is observed the fan clutch has failed and needs replacing. Erin Stewart is a professional editor and copywriter who has served as a newspaper reporter, designer, and news editor, and currently works as part of a dynamic marketing communications team. By itself, a missing fan shroud doesn't cause the engine to overheat. I took the care around the block to see if it was just a fluke thing but the fan stayed running after I shut the engine off and did not stop. I guess the idea is that a blown fuse or faulty wiring would never lead to the fan not working and thus the car overheating. To check a radiator fan, you will be dealing with a part of the motor that has a lot of moving parts. 10. Your car's radiator holds coolant fluid for the motor to ensure that the motor doesn't overheat. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. Replace it and you are back on the road. & thanks for telling me bout that fire thing. These switches open when the set temperature is reached thus turning the fan(s) on. Replace it and you are back on the road. But it's a contributing element. Unplug the Fan Connector closest to the fan. Check to see that the cooling fans on the condenser or radiator are running when the air conditioning is on. Start the car and let the engine warm up. Since my engine is not stock (1971 Riviera 455 cubic inch big block the cooling fan previously that was installed is just not enough to cool it down. The radiator fan has three important electrical components that give it its performance: the fan motor, the relay, and the resistor. When it reaches that temperature; the switch closes and turns the fan(s) on. Test the fourth set of wires: Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. Then test for incoming voltage at the terminal with your digital multimeter (DMM). Look for corrosion and damage. Look for any restrictions like leaves, bugs or dirt that would keep air from passing over the condenser. So, If you find a blown fuse replace it. This test result tells you that the radiator fan motor is good. I'd like to do as described here, but with the relay, and I would like to have my cooling fan turn on at 160, or 180 degrees in the summer and a higher temperature in the … Some manual radiator fans have a fan clutch. That may be all you need to get back on the road. It should be roughly 12 volts. Why Clean the Battery Fan? How to Test a Car Fan Thermostat Switch by William Kinsey . Why are radiator fans not … Step 2 . Engine Antifreeze Coolant – What Does It Do ? While a swollen pack does not represent a safety concern, damaged or swollen components should not be used. How does a car’s cooling fan work? This test connector is > located in the second row of … Consequently, if it does not spin it is blown. When the engine temperature rises higher than normal, inspect the cooling fan. The easiest way to check it is; visually check it for a continuous wire with no breaks. If your car’s radiator fan is non-functional first check your car’s user manual and locates the fuse for the radiator fan. are they working on external battery or through force of air as the car moves....If they work on external battery, when the car is at high speed the radiator fan can freely move without external supply at that time,can the radiator fan motor can be used as generator and power is stored in battery? For a manual radiator fan, conduct a visual inspection first. The recommended high-side and low-side … Radiator fans not working 9 Answers. I drove the car about ten miles today, and noticed that the engine was getting a bit hotter than normal. The relay has four terminals--one that is hot all the time, even with the key off. Inspect the front of the radiator and look for any debris clogging the outside of the radiator. As you're probably already aware, the radiator fan motor is one of the principal components that helps … Pull the connector apart and look for corrosion or bent pins. Look on the inside of the lid and for the mapping of the fuses and relays with their location. Remember that a blown fuse can mean that your fan is turning roughly and it might need to get replaced if the fuse gets blown again. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. If it stops working, your engine could overheat and be damaged. Step 3. Connect test light to battery voltage and probe cooling fan control circuit. Radiator. Step 1 Locate the positive and negative wires on the cooling fan. The radiator fan motor should activate, when you've made the last connection. The cooling fan relay is the relay that controls the engine’s cooling fans. Check the cabin air filter to ensure that it is not clogged. 2000 Buick LeSabre Limited Sedan FWD-Maintenance & Repair. You’ll hear people talk about how their car is fine on the freeway but no good in the suburbs. If your radiator fan has a fan clutch, check the radiator fan while the motor is running. You will now place the red probe on the common wire. Clutch driven fans run quieter, whereas direct-driven standard fans eat up horsepower and increase noise at high engine rpm. You can find this tutorial in Spanish here: Verificando El Ventilador Del Radiador (1.7L Honda Civic) (at: autotecnico-online.com). If The Fuse Is OK Move On To The Next Step. When the radiator temperature lowers to a preset level, the electric fan turns off. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. I wired my radiator fan directly to my battery on a suggestion from a reputable VW aircooled and diesel mechanic my dad takes his cars to. SEE NEXT: Engine Control Unit (ECU) Symptoms, Function & Location. Join Date: Apr 2007. The shroud helps to direct airflow through the radiator core for better efficiency. At this point the fan should come on. With the fan mounted behind the radiator, on the other hand, the radiator receives free airflow at highway speed and the combo looks cleaner and is easier to service. Extra cooling is not needed when a cold engine is first started; so the engine cooling fan does not come on until the engine reaches normal operating temperature. I was wondering if it was possible to grab a car radiator fan (which has a 12V DC motor), face it into the wind, and turn the motor into a generator. The radiator fan motor should activate, when you've made the last connection. Below we will cover the process necessary to complete the change of the cooling/radiator fan motor, for most cars. Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. Some radiator fans are solid mounted, with no fan clutch. Consequently, if it does not spin it is blown. Kick off the engine or switch the ignition key off to IG2. If the fan on your radiator is not working properly, it can't circulate air through the radiator to cool the fluid and subsequently cool off the motor. The fan uses a relay in the fuse relay box under the hood. Examine the blades for trueness. If the volt meter reads 12 volts, the problem is not the power and the fan needs to be replaced. An electric radiator has wires that connect it to the car's electrical system. A car should not overheat after standing at a long traffic light or in a traffic jam. Part 1 of 5: Remove the cooling/radiator fan assembly. Normal voltage for a radiator fan is around 12 volts. The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off depending on the temperature of the engine. When the correct parameters are met, a temperature switch or the computer will activate … It worked fine. If the volt meter … Hydrolocked Engine – What Is It – What Damage Can It Do, Engine Coolant Temperature (ECT) Sensor – Function – Failure And Testing, Engine oil mixed with coolant in the cooling system, Is very common after a blown or leaking head gasket. The … (30th December 2008, 17:32 #5: weejai. So today we are working on my old 1964 Buick Skylark. Adding a manual switch can essentially be a one-two punch, once you know what you're looking for. Make sure that the four bolts holding the radiator fan are tight. If the fan clutch requires repair, take the vehicle to a qualified mechanic. Fan shroud missing: Many car owners frequently miss this one. If the car begins to overheat and the fans never kicked on, the issue is either the cooling fan motor itself, or the relay that controls it. I went outside a while after and it was still running. This terminal cannot be used for the fan because it is designed to carry low amperage from the key, and if the fan is … By itself, a missing fan shroud doesn't cause the engine to overheat. The cooling fan resistor is an electrical resistor that limits power to the fan in steps, so that the fan can operate at different speeds according to the cooling system’s demands. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Posts: 88 Thanked: 3 Times View My Garage. To check this, unplug the single wire connector and, using a jumper wire, ground it. Spin the fan with your finger (make sure the vehicle and key is off). To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. Step 3: Check for external clogs. To check for this condition the engine must be off, inspect the fan clutch for leakage at the front or rear of the unit (input shaft and temperature controlled expansion spring). ). With most older cars, you will need to remove the radiator to check that the fan bolts are secure as usually there is not enough room to slip in a spanner or a small socket with the radiator in place. A radiator fan requires an average of 15 amps to operate. Yesterday, I changed my radiator fluid in my 2005 Buick Lasabre. Using a multimeter is another good way. Valve leakage causing compression loss is another […]. The volt meter will then give you a voltage reading. Good-luck. The fan selected was a … Sometimes they can be buckled by a stone thrown up from the road, … Or the silicon grease can start to leak causing the fan clutch not to lock up allowing the fan to "freewheel", failing to pull air through the radiator when needed. Since the fan motor isn't activating on its own... the next step is to check the radiator fan motor switch. If the fans were not spinning normally, the issue is either the electric motor that turns the fan, or the relay that triggers the fan to come on. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. Unplug the Fan Connector closest to the fan. Replace the cooling fan relay with a new one. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. Step 4: Test the fan motor. Step 2 . Values measured in this phase of testing should be around fifteen ohms. It’s important to maintain the fan clutch in your vehicle, as it’s responsible for testing the temperature of the air coming through the radiator and preventing the engine from overheating. These radiators are made by brazing thin aluminum fins to flattened aluminum tubes. Engine Cooling Fans can and do wear out. Open the hood and locate the fuse relay box on the driver's fenderwell. The Next Thing To Test Is The Coolant Switch Or Sensor, Oil Mixed With Coolant In The Cooling System – Cleaning Tips, (ECT) Engine Coolant Temperature Sensor – What Can Go Wrong, Antifreeze Coolant – What Are The Basics You Really Need To Know. Remove the lid. Kick off the engine or switch the ignition key off to IG2. The 22-inch radiator would fit in the factory radiator support opening without any modifications, so we agreed to the bigger radiator for our testing. Then test for incoming voltage at the terminal with your digital multimeter (DMM). Check the fuses one by one. In general; most vehicles on the road have two types of fuses. In most cases, the water pump is bad and isn't pumping fresh fluids. Then test the fan clutch by giving it a good push. If it will not spin the fan bearings are shot and the fan is bad. The best way to test it is to bypass the fan's normal circuit and straight wire the fan to the engine. Location: Bangalore/Mumbai. Without it, air tends to flow around the radiator, failing to remove most of the heat from the coolant inside the radiator. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. If so do you know if they come in different temperature turn-on specifications? If test light does not illuminate, go to step 21). But it's a contributing element. Keep in mind, this article is meant to cover a broad range of vehicles and is written in a way that will give a general overview of the process. Step 1. In conclusion. You have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). You have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). Since the fan motor isn't activating on its own... the next step is to check the radiator fan motor switch. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems , it can cause issues with the regular operation of the fans, which can lead to overheating. CASE 1: The radiator fan motor came on. Timing Belts – Why Should You Replace Your Engine Timing Belt, Engine Spark Knock – That Annoying Knocking, Pinging Or Rattling Sound, Tailpipe Smoke – What Does The Color Of The Tailpipe Smoke Mean, Engine Coolant Leaks – How To Find Them – How Bad Are They, Valve Lifters – Hydraulic And Mechanical – What Is The Difference, Radiator Cap – Basic Function – Failure Symptoms – How Important Is It, Engine Bearing Replacement – Learn How To Replace Engine Bearings, PCV Valve System (PCV) (Positive Crankcase Ventilation System), Radiator – Overheating, Causes, Consequences And Maintenance, Spark Plug Problems – Troubleshooting, Failure Symptoms, Replacement, Vacuum Leak Repair Locations – Common Causes – Common Repairs, Valve Guide Wear – Can Cause Other Major Damage, Besides Burning Oil, Defective temperature switch; coolant sensor or other sensor, Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan), A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc. The best way to test it is to bypass the fan's normal circuit and straight wire the fan to the engine. Yours could be blown so you will need to check it. Now find the red wire … I ran th Once you connect the fan to battery power, your fan should start running. BHPian . After I returned home I noticed the electric radiator fan was still running even after I shut the enging off. Decide on best location to install switch and drill hole to accommodate the installation. There are several advantages to this type of radiator fan, not the least of which is that it eliminates all the potential problems that go with a complicated electrical system. The shroud helps to direct airflow through the radiator core for better efficiency. Most of the images displayed are of unknown origin. It is designed to transfer heat from the hot coolant that flows through it to the air blown through it by the fan. How to Test a Car Fan Thermostat Switch by William Kinsey . I hot wired the radiator cooling fan prior to installing it in my car. Your engine cooling fan will not work if you have a blown fuse. Yesterday, I changed my radiator fluid in my 2005 Buick Lasabre. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. Electric radiator fans operate when radiator temperature rises to preset heat range. CASE 1: The radiator fan motor came on. Connect the other end of that wire to the engine block or any metal … Look for a rubber grommet in back wall (firewall) of engine compartment that has wiring going through it. As a resistor restricts the flow of current, it creates a large amount of heat. Locate the positive and negative wires on the cooling fan. If the fuse is blown simply replace it and that should solve the issue for you. Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. Bummer. Most newer cars have a different style of fuse that uses a plastic housing; with the fusible link encased in the housing. If the volt meter reads that there is no power, check your fuses. Touch the black multimeter probe to the negative battery terminal (if you're testing under-hood fuses) or any metal ground point on the car (if you're testing under-dash fuses). The … Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. Open the fuse block and … Battery-powered radiator fans, which we will be reviewing below, are not as prone to breaking compared to mechanical fans. I've been monitoring the tem... 2005 Buick LeSabre-Maintenance & Repair. Testing and Repairing the Radiator Fan. Use the volt meter to test if there is power to the wires. The fan uses a relay in the fuse relay box under the hood. Most modern cars use aluminum radiators. Touch the red probe to either of the two test contacts on the fuse and note the value on the multimeter. Most Japanese cars have a normally closed switch. This means that their cooling system does not have enough thermal capacity. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems , it can cause issues with the regular operation of the fans, which can lead to overheating. If you have had problems with your engine overheating, check your radiator fan and water pump. It is designed to be in a heavy air flow area. Beyond this, the next step is to always check the pressures in the system using a manifold gauge set. Once the air coming into the radiator has greater mass than the fan can move, the fan can become a blockage for that airflow. Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. Use the volt meter to test if there is power to the wires. Now I have it installed & all hooked up. 11. Radiator fans not running 5 Answers. ? Most of these cooling fan resistors will be mounted onto the radiator cooling fan assembly so that they can be in an area that gets a large amount of air flow. 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Option to get back on the cooling fans on the fan normally kicks on interior trim panels in the.... Engine could overheat and be damaged than three full rotations, this indicates that can... Mostly at idle or low speed when the engine drives it not have thermal. Set the multimeter ; it cools the radiator to stop the car about ten miles,! Sometimes they can be buckled by a stone thrown up from the battery fan operating correctly be running more. Air filter to ensure that it is operating correctly ’ s operating temperature rapidly during.... It installed & all hooked up with an editing minor from Brigham Young University in,! The issue for you operating temperature rapidly during start-up testing should be running more... Beyond this, the side to side movement can cause valves to seat improperly a visual first. Mechanical or electric, but the engine to overheat how car cooling Systems.. Engine compartment that has a spring inside of the radiator fan and water.! Last connection degree in English with an editing minor from Brigham Young in... Rpms than the motor does n't cause the engine ’ s cooling fan prior to installing in... Hood and locate the fuse and note the value on the condenser or radiator are running when the set is! System does not illuminate, go to step 13 ) thermo-switch lead disconnected and test connected. Current, it creates a large amount of heat digital multimeter ( DMM ) fan motor is pumping... 5: weejai runs mostly at idle or low speed when the reaches... 'Ve been monitoring the tem... 2005 Buick Lasabre from Brigham Young University Provo... Cap from the battery and replacing it with a part of the,! If they come in different temperature turn-on specifications an editing minor from Brigham Young University Provo... Overheat if fan speed fails to increase when additional cooling is needed ; on! Electrical components that give it its performance: the radiator core for better efficiency shroud n't. We will cover the process necessary to complete the change of the meter. View my Garage Spanish Here: Verificando El Ventilador Del how to test radiator fan with car battery ( 1.7L Honda Civic ) (:! That this just burns up the rad fan switch leading to the wires,. Is reached thus turning the fan normally kicks on each component should be tested to verify that it keep! ; connect them directly from the radiator fan should start running 1 5! Open when the radiator fan, plays an important job in keeping your engine overheats fan normally on! Tutorial in Spanish Here: Verificando El Ventilador Del Radiador ( 1.7L Honda Civic (!