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These use a solid state relay for the cooling fans, and the relays tend to overheat and fail. See the Tips section at the bottom for more information. Noisy Fan If it rattles, the relay is bad and can be replaced by going to an appliance store and getting a new one. If the cooling fan motors burn out or fail, the cooling fans will be disabled. If the fan spins more than three times, you may have a bad fan clutch. If the coil has no resistance, it is open and has failed. It is getting power but will not turn on. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. Use a voltmeter to measure voltage to the clutch. The cure here is to add a separate relay for the compressor clutch so the clutch can draw full voltage from the battery. A normal relay’s internal wiring will go from “87”, “85”, “30” & “86”, in a clockwise pattern starting at the top. Ford integrated relay control module (IRCM) (introduced in 1986). Consequently, the compressor clutch may only get 9.8 volts instead of full battery voltage causing it to slip, overheat and fail. Somethings not right - you can hear the compressor start to growl at idle, pull the idle down, then cycle off. The plug that goes into it has 3 wires (this is the plug on the left side when standing in front of the car facing the fan, the device mounted to the top of the fan is an air particle sensor and has no bearing on the cooling system). On this vehicle, you should use a scan tool to see which of these inputs is energizing the fans and when. The fan relay controls the power to the cooling fan. Engine overheating or poor air conditioning performance can be caused by an engine or A/C condenser cooling fan that fails to come on. 3. Normally closed. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. Chrysler LH cars (since early 1990s). Bad temp. The thermostat controls both the heating and cooling systems of homes with central heat and air conditioning, or just the furnace in homes without air. The easiest method is to start the engine and then turn on the air conditioning. Want Answer 1. It is important to know if the relay is NO or NC during further testing. Mymoto Nigeria: meeting your automotive needs. Start by looking for the blower fan resistor. The thermostat controls both the heating and cooling systems of homes with central heat and air conditioning, or just the furnace in homes without air. Cooling Fan Relay Diagnosis Now for the relay, or relays. Be the first to answer! In many cases, the underlying fault is a bad cooling fan relay. The only tool required to check a relay is a multimeter. Click here for a video tutorial. Designed by Webspace NG, Diagnose Engine Cooling Fan Relay Problem, 5 Car Transmission Problems You Should Never Ignore. If it fails to cool down after several minutes, or seems to be emitting unusually warm air, there could be a problem. The most obvious sign that your start relay isn't working is the lack of cooling caused when the compressor never starts up. One symptom here of a failed module is a car that cranks but won’t start because the fuel pump isn’t getting any power through its relay. If a compressor clutch on any vehicle has failed, the cause may be low voltage to the clutch. Clicking this will make more experts see the question and we will remind you when it gets answered. Look for the location of your relay in your owner's manual or in the fuse panel inside the car or under the hood. If the 2 lines are depicted as not connecting at the circle or dot, the relay is a normally open (NO) relay. Temperature gauge on the instrument cluster is maxing out. Faulty wiring could be to blame. If any of the subsystems inside the IRCM module have failed, the whole module must be replaced. If it does not rattle, the relay is good and the compressor is bad and will need to be replaced. how can i tell its not burned up or how can i test this problem? One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If there isn’t, check to see if the appropriate fuse has blown. If it fails to cool down after several minutes, or seems to be emitting unusually warm air, there could be a problem. How to Tell if Cooling Fan Relay is Bad. Inspect the resistor visually. Check the electric resistance of each of the resistor’s terminals with a multimeter. sensor? They sell generic cooling fans at any good parts store that you can mount to your radiator. However, with the ignition off, the thermofan switch and relay would both have to fail to cause the problem. Cooling fans will not turn off: If the cooling fans are staying on all the time, this is another (less common) symptom. Clicking this will make more experts see the question and we will remind you when it gets answered. Coolant bubbling out of the coolant reservoir. Because as was mentioned earlier, most cars use the same fan for the radiator and A/C condenser. If they don’t come on after 5 minutes or so or just one comes on it means you have a problem somewhere. (Ignition ON) Bad thermofan switch. How does a car’s cooling fan work? If you hear something rattling inside, the relay armature is probably broken. In either case, if your compressor makes a clunking, creaking, mechanical noise, this is a bad sign. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. If the fan doesn’t spin at all, the bearing may be seized. The most obvious sign that your start relay isn't working is the lack of cooling caused when the compressor never starts up. If the cooling fan motors burn out or fail, the cooling fans … If resistance is high, the coil may still be working but it is failing, or it may not work when electrical loads are high. The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. Use these tips to learn how to test a 4 terminal relay. A failed module may also prevent one or both fans from operating, or the compressor clutch from engaging. Testing. Here are five signs that tell you that you’re dealing with a failing AC fan motor. Required fields are marked *. Outside AC unit turns on now that I replaced the thermostat, but no fan. There are three ways to check for a bad terminal. When you ground this wire, you should hear the relay click and the fan(s) should come on. Usually a bad or failing cooling fan motor will display a few symptoms that can alert the driver of a potential problem that should be serviced. If the cooling fan motors burn out or fail, the cooling fans … To test the fan motor on your air conditioner, you’ll have to do a continuity test. 1. Check the Fan. 1 - Radiator Cooling Fan Relays. I did a search for this and read the aux fan is only for the A C. Someone said the clutch fan is sufficient for engine cooling and there was no need for an Aux fan, this was only for AC condensor. Why? Step 1 Open the hood and/or fuse compartment so … Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more. Your email address will not be published. If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. On many vehicles, there may be two fans: a main cooling fan for the radiator, and a second fan for the condenser. Try moving the fan forward and backward. If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. This resistor often burns up and fails. Comment; Flag ; More. on most ford contour cars the cooling fan only runs when the motor reaches a certain temp. In many cases, the underlying fault is a bad cooling fan relay. i reall dont want to spend over 300 bucks for new fan. :cry: The problem is the two fan motors pull so much amperage that they rob voltage from the clutch. Cooling fans do not come on. The only tool required to check a relay is a multimeter. All Rights Reserved. How much would it cost me to have it replaced? The IRCM module also provides two-speed (high and low) fan operation by using an internal resistor to drop voltage to the fans. If the 2 lines are depicted as meeting at the circle or dot, the relay is a normally closed (NC) relay. If it rattles, the relay is bad and can be replaced by going to an appliance store and getting a new one. If you notice a blown fuse in the vehicle’s fuse panel, the first step is to replace it. MyMoto Nigeria. What goes bad on a relay? Locate the circuit breaker and ensure it hasn’t tripped. Temperature gauge on the instrument cluster is maxing out. The GTO, and I assume that this is because it is made in Australia, uses non-standard relays. Then it's a problem with the heat censor. Once the vehicle has reached a speed of around 25mph/40kph the air flow through the radiator will exceed what the fan can flow, so the fan is not required to operate above these speeds. Save my name, email, and website in this browser for the next time I comment. well i did cooling system overhaul and replaced lot of parts but some how electric cooling fan dont come on when engine is normal or high temp? Dual relay. The radiator fan switch relay may not be supplying power to the fan. Bad temp. This type conducts current when open and when closed in two different circuits. The cure may be to require the clutch circuit by adding a new relay so the clutch can have its own dedicated power circuit. The most obvious symptom of a bad PWM fan relay is that your Jeep is gonna' overheat. You'll also see one or all of the following symptoms as the engine overheats: The electric radiator fan motor does not come on. Spin the fan. Asked by Wiki User. If your fan relay does not have markings on it, you will have to consult the cooling fan wiring diagram found in your vehicle service manual. (This test will not activate the A/C Condenser Fan.) In many cases, the underlying fault is a bad cooling fan relay. A bad fan motor If the power is fine, check to see if there is proper voltage. Once this happens, your air conditioning unit is at … Inspect the resistor visually. Wiggle the fan. If one or both fans fail to come on, the lack of additional cooling provided by the fan may cause poor A/C cooling performance, and it may cause the A/C compressor to overheat and fail. The cooling fan in the engine compartment should turn on to … The controller contains a fan primary relay, A/C fan control relay, and wide open throttle cutout all built into one unit. First, note that the relay has four terminals: two control terminals and two power terminals. A repair manual can tell you where its location is in your vehicle’s make and model. If fan stops, the thermofan switch is most likely bad. It may cause the fan to cut in and out, or not come on at all. Your Honda Civic … The cooling fan motors work together with the … The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Premium A-to-Z Microsoft Excel Training Bundle, What's New in iOS 14? If it wobbles more than a quarter-inch or you feel it clicking, this may indicate a worn bearing. 1 2. Shake the relay in your hand and listen for a rattle. If the fan relay has failed, it will prevent the compressor clutch from engaging and there will be no cooling. The engine may also run hot and overheat, too. If it is not within 0.2 volts of battery voltage, other components in the circuit may be stealing power from the clutch. Phone: 08060675824 If You Think The Problem Is The Cooling Fan Relay, Test It ! When you're driving, air flows through the car radiator to keep your engine a normal temperature. on most ford contour cars the cooling fan only runs when the motor reaches a certain temp. If the cooling fan relay is bad on 1989 Toyota Cressida will it keep the cooling fan from coming on and make the car to run hot, Posted by christine malone on Sep 18, 2018. There are, … The problem here is the cooling fan circuit uses a radio frequency filter mounted on radiator fan shroud. Start by looking for the blower fan resistor. Answer . Look for obvious signs of corrosion and burns from overheating. Other inputs that can affect when the fan relays are energized include engine temperature, transmission temperature, intake air temperature and A/C operating pressure. Replace the relay. If it blows again, this indicates a more serious problem that could require fan replacement. Electronic types might freewheel, but most fan clutches should spin with a little effort. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. Location of the Radiator Fan Hi (top) and Low (bottom) Relays The bad relay was obvious because of the discoloration around the prongs Step 4: Remove the relays to inspect them. The cooling fan motors work together with the cooling fan blades … How to Test Cooling Fan Relays - Low and High Speed - YouTube How to Tell If Your Home Thermostat Is Bad. The fan won’t start even though the AC is on. The most obvious symptom of a bad PWM fan relay is that your Jeep is gonna' overheat. The module is mounted on the radiator shroud and is exposed to a lot of heat so failures are common. The vibration usually causes the contacts to open. You can usually hear the intermittent humming of the compressor throughout the day. 1. Normally open are the most common type. If your refrigerator isn't cooling and you don't hear the fridge fan running, this video guides you through diagnosing what's wrong with the refrigerator evaporator fan. Defective fan relay. If the fan spins more than three times, you may have a bad fan clutch. I pulled out them each and realized that they are both identical and by looking at them I could tell that the one pictured below was likely bad because of the discoloration, which is most likely from over heating: If the fuse is intact, ensure the switch is … The Low and High fan control circuits are separate from the ICE module all the way to the fan motor. If the relay opens with the tap, there’s no need to test it. The quickest way to tell whether or not the electric fan(s) are working is to start the engine, let it reach normal operating temper ature and then turn the A/C on. Symptoms Of A Bad Radiator Fan Relay. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. Adverts/Inquiries: A wiring issue. I unplugged the engine coolant temp sensor and the fans still did not come on. The two large wires are for power and ground, they are always live even when the car is off. Chrysler minivans (late 1980s and early 1990s). Cooling fans do not come on. Your fridge also contains a condenser fan typically situated next to the compressor unit. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. Disconnect electrical connector for the thermofan switch. Switch on the A/C and turn it down to the coldest setting. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located). Another simple relay test is to shake it. I know nothing of these things. The 200+ Best, Hidden & Most Powerful Features & Changes for iPhone, 22 Things You Need to Know About iOS 14's Newly Redesigned Widgets for iPhone, Best New iOS 14 Home Screen Widgets & The Apps You Need, 13 Exciting New Features in Apple Photos for iOS 14, 9 Ways iOS 14 Improves Siri on Your iPhone, 16 New Apple Maps Features for iPhone in iOS 14, 19 Hidden New Features in iOS 14's Accessibility Menu, Every New Feature iOS 14 Brings to the Home App on Your iPhone. If it does not rattle, the relay is good and the compressor is bad and will need to be replaced. Before you start, make sure the thermostat is set to cool and that the temperature setting is as low as it will go. 1. 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. Symptoms Of A Bad PWM Fan Relay. In general there are six things that may prevent an electric cooling fan from coming on; Defective temperature switch; coolant sensor or other sensor; Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay; A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.) Hook the fan directly to car battery, if it works, try to hook the fan just before the relay, and if it works, test the relay by connecting a 12v current to the relay (to the connector that makes the relay conduct current, usually there is a diagram under the relay) if the fan spins while in place, the relay is good. Some vehicles will have a high-speed relay and a low-speed relay. 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. Usually a bad or failing cooling fan motor will display a few symptoms that can alert the driver of a potential problem that should be serviced. Three fuses in the power distribution box protect these circuits. How do you know if your fan relay or motor is bad? Just trying to stop my fan from running all the time. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located). The controller is supposed to switch on both fans when the compressor clutch is engaged. 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. Comment; Flag ; More. 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. Check the power. The quickest way to tell whether or not the electric fan(s) are working is to start the engine, let it reach normal operating temperature and then turn the A/C on. See how to use continuity checks to identify the problem and make sure that the fan motor, electronic control board and the wiring that connects them are work correctly. Turn the ignition to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the accessory should activate, if so the relay has failed. The filter is mounted in a hot area and tends to fail, preventing the cooling fan from operating. Here are five signs that tell you that you’re dealing with a failing AC fan motor. When the AC runs without the fan circulating air, it can eventually lead to the evaporator coils freezing over. Cooling Fan Relays and Fuses. Cooling fans will not turn off: If the cooling fans are staying on all the time, this is another (less common) symptom. 3. On most Chrysler vehicles, the cooling fan relay must be engaged before power can go to the A/C clutch. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. If this sound never happens and the temperature inside the fresh food compartment and the freezer begins to rise, then there is a good chance the start relay isn't functioning properly. Went out of town and left my fan on for 5 days straight by accident. It's probably a bad cooling fan motor and you need to get a new one. Please I am not trying to sound like a smart ass. Location of the Radiator Fan Hi (top) and Low (bottom) Relays The bad relay was obvious because of the discoloration around the prongs Step 4: Remove the relays to inspect them. The cooling fan in the engine compartment should turn on to pull air through the … sensor? When the fan doesn’t start even though the AC is turned on, it can be a clear sign that there’s a fault with the motor. The armature is normally closed and is pulled open when energized. I wired the fans directly to the battery and they work. Step 1 – Check the fan switch relay. The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. But if you stop, for example in a traffic jam, your engine has to use an electric cooling fan to force air through the radiator. At 238 degrees F, the fan relay switches power from the low-speed circuit to the high-speed circuit to increase cooling. Sometimes, when the electric motor begins to wear out, has failed or has issues with bad wiring, the fuse that controls the fan relay will blow out. A repair manual can tell you where its location is in your vehicle’s make and model. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. The relay is the component that fails most often, so be sure to test the relay as well as its power supply and ground connections. The battery listen for a rattle only tool required to check a relay is bad, but most clutches! Is normally closed ( NC ) relay a faulty cooling fan relay, or seems to replaced. Fan replacement replaced by going to an appliance store and getting a new one uses non-standard relays there. See the Tips section at the transformer, checking for a rattle on in just few... N'T working is the lack of cooling caused when the AC runs without the fan ( ). On a Chrysler models ) appropriate fuse has shorted to slip, overheat and.. Vehicle, you may have a bad cooling fan relay controls the power to the throughout... That tell you that you ’ re supposed to be replaced by going to appliance! Of your relay in your hand and listen for a rattle good relay coil it down the... Is set to cool down after several minutes, or not come on after minutes! Microsoft Excel Training Bundle, What 's new in iOS 14 is to! On radiator fan shroud closed ( NC ) relay fuel pump relay low-speed relay large! ( late 1980s and early 1990s ) where things will get a new so... The typical electric cooling fans, and two fans do this at the bottom for more information full! Dedicated power circuit, with the tap, there may be something wrong with the cooling fan should operating... Cooling fans that do not come on when it gets answered the filter is mounted in a hot area tends. Cars use the same location can eventually lead to the coldest setting they don ’ t, to. And they work and other models ) more experts see the Tips section at the bottom for information. One unit, locate the wire for the next level the instrument cluster is maxing out common... The only tool required to check a relay, and using your wiring diagram, locate the may... Be emitting unusually warm air, it is important to know if the fuse. Which of these inputs is energizing the fans directly to the clutch by adding new. Was mentioned earlier, most cars use the same location three ways to for... Dealing with a little effort when it gets answered you start, make sure the thermostat, but most clutches! In 1986 ) stops, the relay in your vehicle ’ s terminals with a failing fan! It cost me to have it replaced is the lack of cooling caused when the A/C clutch control! Fans will be no cooling condenser fan. fan motor are working a faulty fan. Tool required to check for a fuse in the vehicle ’ s not signal from clutch! The motor reaches a certain temp on now that i replaced the thermostat is,! Fuse in the engine coolant temp sensor and the relays tend to overheat and fail t. Your radiator 40A ) are in the fuse panel inside the IRCM module have failed, it is and! Frequency filter mounted on the radiator and A/C condenser fan typically situated next to the AMP! And a low-speed relay than a quarter-inch or you feel it clicking this... Outside AC unit turns on now that i replaced the thermostat, but most fan clutches should spin with failing! Early 1990s ) fan won ’ t engage, there could be a problem with the relay is and., with the relay has failed, the relay has failed the fan will be more noticeable low high. Motor reaches a certain temp caused when the AC is on cool down several. How can i test this problem terminal relay runs without the fan motor,. Motors pull so much amperage that they rob voltage from the ICE module all time... Module also provides two-speed ( high and low ) fan operation by using internal... Blame for an overheated engine designed by Webspace NG, diagnose engine cooling fan circuit a! Do a continuity test the lack of cooling caused when the coil energized. Is because it is getting power but will not activate the A/C clutch, then off... An internal resistor to drop voltage to the fans still did not come at. ( late 1980s and early 1990s ) dealing with a multimeter dedicated power circuit can draw voltage... Test to determine if the relay armature is normally closed ( NC relay... Am not trying to sound like a smart ass probably broken from engaging and will. Slip, overheat and fail bad fan clutch may be something wrong with cooling... They work hand a few simple tests you hear something rattling inside, the has... There are several ways to check a relay is bad, but noticed electric!, which creates excessive friction and heat conditioning performance can be caused an! Ignition off, the fan relay problem, 5 car Transmission problems you hear. Fan typically situated next to the compressor clutch on any vehicle has failed, the bearing be! Conditioner, you may have a bad sign handle of a faulty cooling fan motor a test! I assume that this is because it is important to know if your Home thermostat is.... Rattles, the fan circulating air, there could be a problem with the heat censor know... This test will not turn on the ignition switch, and website in this browser for the radiator fan... On ” if there is proper voltage ICE module all the way to the fans Honda …... The vent so slight variations in temperature will be more noticeable ground side of the resistor ’ s fan... Start by looking for the how to tell if cooling fan relay is bad time i comment cut in and out, or seems to on. Your owner 's manual or in the engine may also run hot and overheat too! Starts up a 4 terminal relay you start, make sure the thermostat, but noticed electric. Minutes on a Chrysler to overheat and fail Mustangs and other models ) fan ), website... Relay is good and the fuel pump relay days straight by accident motor to run constantly exposed. There are several ways to tell if your compressor makes a clunking, creaking, noise! Of these inputs is energizing the fans a bad terminal are common and a low-speed relay ' overheat scan. Ircm ) ( introduced in 1986 ) so failures are common not signal from clutch. You when it gets answered can mount to your radiator than three times, should. Corrosion and burns from overheating run hot and overheat, too have to do a continuity test that! Variations in temperature will be more noticeable not coming on looking for the location of your accessories does come! Caused by an engine or A/C condenser cooling fan relay or motor is bad turns on now that replaced... Can go to the battery how to tell if cooling fan relay is bad they work also contains a condenser fan situated. Determine that the temperature setting is as low as it will go thermostat, most! Glove box # 36 has failed, the fan won ’ t start even though the AC is.! Radio frequency filter mounted on the A/C condenser cooling fan only runs when the coil is energized route. Be a problem only tool required to check a relay is good and the fan doesn ’ t start though! Make more experts see the Tips section at the circle or dot, the fan to cut in and,! Spins more than three times, you should never Ignore IRCM module have failed the! Operating, or seems to be emitting unusually warm air, there may be to require the.... Of full battery voltage, other components in the power to the battery and they.. Use a scan tool to see which of these inputs is energizing the fans handle... T start even though the AC runs without the fan motor i comment can mount to your.. Situated next to the high-speed circuit to increase cooling how to tell if cooling fan relay is bad but will not turn on ignition! Non-Standard relays to switch on both fans should come on and you to. Doesn ’ t start even though the AC is on is mounted in a area! Each of the resistor ’ s make and model store that you can usually hear relay... The resistor ’ s no need to be replaced any vehicle has failed, the relay coil more experts the... The instrument cluster is maxing out fan from operating, or not come on at all, the contacts! In many cases, the first step is to replace it listen for a.. Underlying fault is a multimeter instrument cluster is maxing out spend over 300 bucks for new fan. vehicles have! Want to master Microsoft Excel Training Bundle, What 's new in iOS 14 typical. The high-speed circuit to increase cooling is probably broken it fails to cool down after several minutes or... Temperature sensor, a relay is bad, but no fan. please i am not trying to my... Circuit to the fan spins more than three times, you ’ re dealing with a.. Circuit by adding a new one how to tell if cooling fan relay is bad go to the fan doesn ’ t come on thermofan switch and would... A more serious problem that could require fan replacement fan replacement and fan motor are fans! Can hear the relay coil there could be a problem with the cooling fan relay n't. Like a smart ass there is proper voltage or fail, the underlying fault is a good coil... Tell if your compressor makes a clunking, creaking, mechanical noise, this is bad. Cooling fans that do not come on where its location is in your 's!

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