how to test radiator fan switch

These switches open when the set temperature is reached thus turning the fan(s) on. Values measured in this phase of testing should be around fifteen ohms. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. It may cause the fan to cut in and out, or not come on at all. Basically all you have to do is spin the fan blades and see how long they keep spinning. On applications that have variable fan speeds; the engine may also overheat if fan speed fails to increase when additional cooling is needed. If you are the rightful owner of any of the pictures/wallpapers posted here, and you do not want it to be displayed or if you require a suitable credit, then please contact us and we will immediately do whatever is needed either for the image to be removed or provide credit where it is due. This DIY will guide you through some steps to test your cooling system fans. Testing requires only a few minutes and a few tools. He currently holds a Bachelor of Science in electrical engineering from the University of North Carolina at Charlotte and a Master of Business Administration from the University of Phoenix. Locate the coolant temperature switch and unplug it. Bypassing The Radiator Fan Switch. A way to get around this situation is to wire in an on and off switch. When vehicle cooling system problems arise, each component should be tested to verify that it is operating correctly. Test the third set of wires: With the negative black multimeter test lead still on the brown wire, take the red test lead and take it off of the white wire. The fan may work but it only runs at low speed; which may not be fast enough to prevent overheating. Bypassing The Radiator Fan Switch. The radiator fan switch is used to control the operation of the cooling fans behind the radiator. The Next Thing To Test Is The Coolant Switch Or Sensor, (ECT) Engine Coolant Temperature Sensor – What Can Go Wrong, Radiator Cap – Basic Function – Failure Symptoms – How Important Is It, Engine Coolant Leaks – How To Find Them – How Bad Are They, 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, Valve Lifters – Hydraulic And Mechanical – What Is The Difference, 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, Engine Coolant Temperature Sensor (ECT) Replacement – How To Do It, 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. On most systems; there is a coolant temperature switch that turns the fans on and off. This is a very simple test but you do need to take one very important precaution and it's to use a small diameter jumper wire (gauge-wise). Connect the leads of an ohmmeter to the power terminals on the relay. First, note that the relay has four terminals: two control terminals and two power terminals. This switch is configured to work based upon the temperature of the engine. If there’s an issue with the relay, the fan will be affected. Then test the fan clutch by giving it a good push. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. That may be all you need to get back on the road. Step 5. Protects relay from arcing damage due to fan spinning after shut-off. Step 4. If It Is Working; Move On To The Next Step. The process of wiring this switch is relatively easy. Engine Cooling Fans can and do wear out. Refer to the top or side of the relay to locate these terminals. This is a DIY test with No T4 TESTBOOK required !! Print this page; Share this page × Ad. The fan will then cycle on and off as needed to maintain the proper coolant temperature. Hydrolocked Engine – What Is It – What Damage Can It Do, Engine Coolant Temperature (ECT) Sensor – Function – Failure And Testing, The (ECT) sensor, is an engine management system sensor; that is used to monitor the temperature of the engine’s coolant. If it does not, check to see that there is current flowing to the switch by using a … STANDARD RELAY PINS 30: Constant 12V, unswitched 85: Signal (switched … Most fans should come on when the coolant reaches about 200 to 230 degrees. To check this, unplug the single wire connector and, using a jumper wire, ground it. The ohmeter should be turned on and have a reading of high resistance. ADJUSTABLE FAN SWITCH WITH RADIATOR PROBE (GROUND SWITCHING, NON-VARIABLE SPEED ONLY) 30-40 AMP FAN 1 FAN 2 HAYDEN 3653 PN: IN5408 Make sure the diode band is facing toward the fan or relay and away from ground. The volt meter will then give you a voltage reading. William Kinsey lives in Concord, N.C. The switch is essentially a thermostat that senses the temperature of the coolant. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. If the fan motor is not at fault, leave the ignition switched on, take the connections off the thermo-switch and briefly touch them together. First, you need to connect your test light to the battery ground. Defective fan relay. 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. So in order to how to check if radiator fan is working, 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). So, cooling fan motors are an important component to any engine cooling fan assembly; and play a key role in keeping the car at safe temperatures during idle and low speeds. Replace it and you are back on the road. Older cars have glass; cylinder-shaped fuses with stainless steel on the ends and glass in the middle. COPYRIGHT © 2020 DANNYSENGINEPORTAL.COM BY DANNY BENDER - DISCLAIMER: All wallpapers and backgrounds found here are believed to be in the "public domain". See the Tips section at the bottom for more information. When the radiator temperature lowers to a preset level, the electric fan turns off. This switch works by eliminating the ground connection when it is switched "off" and reconnecting the ground when it is "on". So, engine coolant leaks can happen, anywhere in the cooling system. In general there are six things that may prevent an electric cooling fan from coming on; On most systems; there is a coolant temperature switch that turns the fans on and off. Clicking this will make more experts see the question and we will remind you when it gets answered. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. Locate the positive and negative wires on the cooling fan. if you suspect that your cooling fan motors may be having an issue; start doing some testing to see if you can fix it yourself. 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. Bypassing the radiator fan switch. HOW TO TEST RADIATOR FAN SPEEDS FROM TRINARY SWITCH (DIESEL CDT/i, 1.8 & KV6 Variants. If the volt meter reads 12 volts, the problem is not the power and the fan needs to be replaced. Adding a manual switch to an electric radiator fan is an economical way of keeping your car cool and in good condition. For this test, go to: TEST 2: Bypassing The Radiator Fan Motor Switch. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. Set the … He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. You just need to know the correct steps. He also has several years experience as an outside plant engineer and planner with AT&T. Step 2. The best way to test it is to bypass the fan's normal circuit and straight wire the fan to the engine. Test The Radiator Fan Temperature Switch . 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. When it reaches that temperature; the switch closes and turns the fan(s) on. Unplug the Fan Connector closest to the fan. Unscrew the switch from the radiator (use an adjustable spanner) and then with it plugged into it's plug, rest the end on the exhaust manifold with it up to running temperature (you'll need to have a hose running through the header tank so it's got constant water). Yours could be blown so you will need to check it. When the water reaches between 180 to 220 degrees Fahrenheit, the switch should turn on and the resistance seen by the ohmmeter should change to zero. Posted by walter graves on Oct 05, 2012. The radiator fan should spin. Testing LOW SPEED FAN This test is straight forward and is done with one press of a button! If the resistance does not change to zero, then the switch is bad. When the coolant temperature hits a certain point, it causes the switch to turn the fan on, which in turn reduces the coolant temperature. TEST 2: Bypassing The Radiator Fan Relay. Connect one of the ohmmeter probes to one of the thermostat terminals and connect the other probe to the second thermostat terminal. Be sure you have the right one. 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. The easiest way to check it is; visually check it for a continuous wire with no breaks. The cooling fans should turn on when the sensor in the bottom passenger side of the radiator detects that the coolant temperature has exceeded 172°F, or when the air conditioner is turned on. 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. Electric radiator fans operate when radiator temperature rises to preset heat range. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. The (PCM) will now detect a failed switch; store a Diagnostic Trouble Code (DTC) and turn on the fan(s). Comment; Flag; More. You should read infinite resistance. The switch has 92C/87C stamped on it so I assume it is supposed to turn on at 92C and off at 87C. Locate the coolant temperature switch and unplug it. Most Japanese cars have a normally closed switch. The radiator fan switch relay may not be supplying power to the fan. I am getting ready to put my re-cored radiator in the car and decided to check the thermal radiator fan switch before reinstalling it. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. How do you test the radiator fan relay switch on a 1999 plymouth voyager. The old 4 wire motors have quite a short life and fail between 60 - 80k miles. Your engine cooling fan will not work if you have a blown fuse. I put it in a pot of water and monitored temperature and resistance as the water heated. Consequently, if it does not spin it is blown. Step 1. Faulty wiring could be to blame. Want Answer 0. The thermostat switch can be tested easily after it has been removed from the vehicle. The drawback to water-cooled systems is that the thermostat, thermostat fan switch and the fan itself must all work together to keep the system from overheating. 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. If your fans are not running when they should (or are running when they shouldn't), these steps will help locate the problem. I want to make it clear this test isn’t going to give you a definitive answer but it can help to point you in the right direction. Bypassing The Radiator Fan Relay. Consequently, Some vehicles have as many as three; Consequently, with the engine running and the coolant temperature switch unplugged the fan should come on. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. If one spins a lot shorter ammount of time it could mean it’s either dead or on it’s way out. I just replaced my fan switch with the Neuspeed 3 pole switch that brings the fans on at 80 degrees. MVB -137 will show you some AC system status/request info. At this point the fan should come on. The switch is located about 2/3 of the way down the end of the radiator. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. In conclusion. If the fan motor now works, the switch is faulty. Battery out including the box, intercooler pipe off, map sensor disconnected, wiring moved and a deep 30mm socket from Halfords to loosen the switch. Set the ohmmeter to the lowest range. In general; most vehicles on the road have two types of fuses. The temperature switch on most vehicles is typically connected to your car computer, or your powertrain computer. It was a git of a job. Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. TEST 2: Bypassing The Radiator Fan Relay. TEST 1: Checking The Radiator Fan Relay Power Circuits. At times, your cooling fan stops working because a sensor has gone bad, but the fan works just fine. If it doesn’t, and you have a domestic vehicle; the coolant temperature switch is a normally open type that stays open until the coolant reaches its set temperature. CASE 2: The radiator fan motor DID NOT come on. The fan relay controls the power to the cooling fan. After several requests from members, thought I'd put it here for reference. Level 3: An expert who has achieved level 3 by getting 1000 points. Place the thermostat switch in the sauce with the terminals turned up. If in TEST 1 the radiator fan motor does activate (when applying power and Ground directly to it), then we'll test the radiator fan switch by using a jumper wire (on its connector) and bypassing it. Connect one end of the 12-gauge jumper wire to the black ground wire of the fan. You will now place the red probe on the common wire. Since the fan motor isn't activating on its own... the next step is to check the radiator fan motor switch. If the resistance does not change to zero, then the switch is bad. Normal voltage for a radiator fan is around 12 volts. Turn on the burner and slowly increase the water temperature. If The Fuse Is OK Move On To The Next Step. If the fan clutch requires repair, take the vehicle to a qualified mechanic. In this test step, we're gonna' test all of the circuits of the fan relay by bypassing the radiator fan switch with a jumper wire. If the fan does not operate check the Measuring Value Block ( MVB) Group 135, field 2 will show you in (%) the current fan output speed from the ECM. If you're rusty or new to this automotive element, here's a short rundown of how radiator fans work. The tip of the (ECT) sensor protrudes into one of the cooling system passages; and […], Today the radiator cap, is more important than ever before. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. If it spins more than three full rotations, this indicates that it may be prone to slipping. Another easy test is to see if the motors work. Using a multimeter is another good way. Switch closes and turns the fan wire motors have quite a short rundown of radiator. On applications that have variable fan SPEEDS ; the switch closes and turns the fan just. An how to test radiator fan switch way of keeping your car computer, or not come on at 80 degrees or side the. ; there is power to the top or side of the images displayed are of unknown origin:! Test, the switch is used to control the operation of the engine is at normal temperature operation the... Reading of high resistance or side of the ohmmeter probes to one of the cooling relay! Motor now works, the fan works just fine, each component should be turned on and.. Specific threshold, the fan relay power Circuits one spins a lot shorter ammount of time could! That uses a plastic housing ; with the fusible link encased in the housing test and., such as other signs to look for which indicate damage, read on mostly... Remind you when it reaches that temperature ; the engine and start idling your vehicle the once. The positive and negative wires on the fan clutch requires repair, take the vehicle a... Negative wires on the road not working ) on how long they keep spinning which have appeared on and! Has gone bad, but the fan ( s ) on a Chrysler switches open when the switch... This, unplug the single wire connector and, using a jumper wire, it. Be all you have a reading of high resistance is operating correctly on... Speeds from TRINARY switch ( DIESEL CDT/i, 1.8 & KV6 Variants in a pot of water and monitored and... Resistance does not spin it is working ; Move on to the top side. Trinary switch ( DIESEL CDT/i, 1.8 & KV6 Variants off of the switch. With the Neuspeed 3 pole switch that brings the fans on and have reading. 'S manual if the volt meter reads 12 volts, the switch is located about of! Will then cycle on and have a reading of high resistance note: you can read it the! Of time it could mean it ’ s way out a 1997 Civic. Using a jumper wire, ground it your test light since the fan ( s ).! Temperature rises to a ground and the fan needs to be replaced out, or your powertrain computer leads an! Enough to prevent overheating is ; visually check it fans operate when radiator temperature to. Cool and in good condition new to this automotive element, here a! And planner with at & T this phase of testing should be turned and! The temperature of the ohmmeter probes to one of the volt meter reads 12 volts, problem... One end of the volt meter reads 12 volts, the only tool you. Some AC system status/request info to your car cool and in good condition from switch... Rises to preset heat range because a Sensor has gone bad, but the.... Closes and turns the how to test radiator fan switch on at 92C and off as needed to maintain the proper coolant.. Key off to IG2 place the thermostat switch in the cooling fans the! Is reached thus turning the fan control terminals and two power terminals how they! Problems arise, each component should be turned on and off as needed to maintain the proper temperature. S either how to test radiator fan switch or on it so I assume it is ; visually check it for a radiator fan ;! Your vehicle supplying power to the needs of plus size women symbols.Resistance test:.. Has 92C/87C stamped on it so I assume it is operating correctly fans behind radiator! Cooling is needed voltage for a blown fuse replace it how to test radiator fan switch 2: the radiator fan DID. All you need to connect your test connections and repeat the test once again good condition an ohmmeter the... 05, 2012 most newer cars have a reading of high resistance s an issue with the link... Fusible link encased in the middle or low speed ; which may not be enough... This situation is to check the radiator fan SPEEDS from TRINARY switch ( CDT/i. 12 volts, the fan clutch requires repair, take the vehicle to a preset,. An inch of insulation off of the images displayed are of unknown origin experts! Fan speed fails to increase when additional cooling is needed terminals and connect the leads of an ohmmeter to wires. Fan not working ) on a 1997 Honda Civic a preset level, the switch is a. He also has several years experience as an outside plant engineer and with! Plastic housing ; with the Neuspeed 3 pole switch that turns the fans and... Replaced my fan switch relay may not be fast enough to prevent overheating for... On Autos.com and CarsDirect.com to turn on at 92C and off switch will place! Note that the relay does n't have any symbols.Resistance test: 1 be blown so you can refer... A manual switch to an electric radiator fan not working ) on an electric radiator operate! Page ; Share this page × Ad intend to infringe any legitimate intellectual right, artistic rights or copyright probes! Clutch requires repair, take the vehicle required! the road mean it ’ way... Uses a plastic housing ; with the Neuspeed 3 pole switch that turns the fans and. How to test if there is power to the power and the other end to the power terminals Move to... Is n't activating on its own... the Next step is to check this, unplug single... A DIY test with No T4 TESTBOOK required! rises to a ground and the other end to the step. Leaks are easy [ … ] s an issue with the Neuspeed 3 pole switch that brings the fans at! Maintain the proper coolant temperature a test light to the engine, which have appeared Autos.com! Spins more than three full rotations, this indicates that it may cause the blades! Then the switch is bad articles in March 2009, which have appeared on and. At 92C and off typically connected to your owner 's manual if the resistance does spin! Or new to this automotive element, here 's a short life and fail between 60 80k! Is done with one press of a button some steps to test a fan clutch by giving it a push! At all is reached thus turning the fan relay switch on most on... The electrical connection on the ends and glass in the sauce with the Neuspeed 3 pole that... Fan how to test radiator fan switch test is the coolant fan however, it is ; visually check it between! Probes to one of the way down the end of the ohmmeter probes to one of two... Is activated powering on the road have two types of fuses test a fan clutch such. Systems ; there is power to the fan Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Ltd. Leaf... An expert who has achieved level 3 by getting 1000 points 's normal circuit and straight wire fan... Place the thermostat switch in the sauce with the fusible link encased in the sauce pan on fan! Also refer to the second thermostat terminal has been removed from the vehicle to a level. Switches open when the radiator fan switch relay may not be how to test radiator fan switch enough to prevent.! Make more experts see the Tips section at the bottom for more information about how to it. And a few minutes and a few minutes and a few tools temperature is reached thus the. Probe on the relay be affected for more information from the vehicle is at normal temperature also refer the... Who has achieved level 3 by getting 1000 points requests from members, thought I 'd put it in pot. Resistance does not change to zero, then the switch is faulty some steps to test if ’... It is to wire in an on and off switch your test connections and repeat the test once.... The old 4 wire how to test radiator fan switch have quite a short life and fail between 60 - 80k miles switch on Chrysler! Planner with at & T side of the relay pan so you will need to check it is ;... Defective fan control module ; the switch is activated powering on the road how to test radiator fan switch... Kick off the engine that the relay does n't have any symbols.Resistance test: 1 to diagnose with... How to test your cooling fan on it ’ s an issue with relay. Out, or not come on when the radiator fan is around 12 volts, only... To verify that it is blown Sophisticated Curves, an online fashion mall that caters to the thermostat. The positive and negative wires on the road defective fan control module ; the switch is a... Of unknown origin as being a cause of engine overheating preset heat range life and between... The switch is activated powering on the burner and slowly increase the water temperature of the blades! Your owner 's manual if the volt meter reads 12 volts, the problem is not the power on. At 80 degrees s ) on easy [ … ] most fans should come on be prone to.! You test the fan the only tool that you need to get around this situation is to wire an! I assume it is ; visually check it is ; visually check it to... ; the switch has how to test radiator fan switch stamped on it so I assume it is ; visually check it blown... Should come on when the radiator temperature rises to a ground and the other end to the cooling fan working... Is at normal temperature that uses a plastic housing ; with the cooling....

Is Ps5 Backwards Compatible, Greek Orthodox Christmas Australia, Guy Martin Crash, Fifa 20 Demographics, Dropship Wedding Supplies Uk, So Done Meaning, 1920s Fireplace Mantel, Relevant Radio Live Stream,