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how to test radiator fan switch

The switch is located about 2/3 of the way down the end of the radiator. 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. 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, If you find a blown fuse replace it. 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. However, it is often overlooked, as being a cause of engine overheating. This DIY will guide you through some steps to test your cooling system fans. Kick off the engine or switch the ignition key off to IG2. Protects relay from arcing damage due to fan spinning after shut-off. It may cause the fan to cut in and out, or not come on at all. If the fan clutch requires repair, take the vehicle to a qualified mechanic. The switch has 92C/87C stamped on it so I assume it is supposed to turn on at 92C and off at 87C. The thermostat switch can be tested easily after it has been removed from the vehicle. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Set the ohmmeter to the lowest range. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. The fan will then cycle on and off as needed to maintain the proper coolant temperature. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. Locate the coolant temperature switch and unplug it. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. If you're rusty or new to this automotive element, here's a short rundown of how radiator fans work. When it reaches that temperature; the switch closes and turns the fan(s) on. The radiator fan switch is used to control the operation of the cooling fans behind the radiator. If The Fuse Is OK Move On To The Next Step. Use the volt meter to test if there is power to the wires. 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). Then test the fan clutch by giving it a good push. 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 radiator fan should spin. 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. Normal voltage for a radiator fan is around 12 volts. You just need to know the correct steps. Refer to the top or side of the relay to locate these terminals. Locate the coolant temperature switch and unplug it. William Kinsey lives in Concord, N.C. Be sure you have the right one. The best way to test it is to bypass the fan's normal circuit and straight wire the fan to the engine. 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. 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. The switch is essentially a thermostat that senses the temperature of the coolant. When vehicle cooling system problems arise, each component should be tested to verify that it is operating correctly. Testing requires only a few minutes and a few tools. 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. Bypassing The Radiator Fan Switch. 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. 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. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. Set the … The volt meter will then give you a voltage reading. Comment; Flag; More. On applications that have variable fan speeds; the engine may also overheat if fan speed fails to increase when additional cooling is needed. 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. Basically all you have to do is spin the fan blades and see how long they keep spinning. Turn on the burner and slowly increase the water temperature. HOW TO TEST RADIATOR FAN SPEEDS FROM TRINARY SWITCH (DIESEL CDT/i, 1.8 & KV6 Variants. For this test, go to: TEST 2: Bypassing The Radiator Fan Motor Switch. At times, your cooling fan stops working because a sensor has gone bad, but the fan works just fine. 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 it spins more than three full rotations, this indicates that it may be prone to slipping. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. In conclusion. 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. First, note that the relay has four terminals: two control terminals and two power terminals. That may be all you need to get back on the road. Electric radiator fans operate when radiator temperature rises to preset heat range. If your fans are not running when they should (or are running when they shouldn't), these steps will help locate the problem. If the resistance does not change to zero, then the switch is bad. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. Connect one of the ohmmeter probes to one of the thermostat terminals and connect the other probe to the second thermostat terminal. The ohmeter should be turned on and have a reading of high resistance. It was a git of a job. COPYRIGHT © 2020 DANNYSENGINEPORTAL.COM BY DANNY BENDER - DISCLAIMER: All wallpapers and backgrounds found here are believed to be in the "public domain". 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. MVB -137 will show you some AC system status/request info. Most newer cars have a different style of fuse that uses a plastic housing; with the fusible link encased in the housing. STANDARD RELAY PINS 30: Constant 12V, unswitched 85: Signal (switched … Most Japanese cars have a normally closed switch. Using a multimeter is another good way. NOTE: You can modify the above tests to suit your particular diagnostic needs. 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. So, The fan runs mostly at idle or low speed when the engine is at normal temperature. 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. For this test, the only tool that you need is a test light. TEST 2: Bypassing The Radiator Fan Motor Switch. If there’s an issue with the relay, the fan will be affected. Posted by walter graves on Oct 05, 2012. Fortunately, nine out of 10 times, engine coolant leaks are easy […]. This is the detailed process of how to diagnose an overheating problem (Radiator Fan not working) on a 1997 Honda Civic. If the resistance does not change to zero, then the switch is bad. Connect one end of the volt meter to a ground and the other end to the electrical connection on the fan. Bypassing the radiator fan switch. Test The Radiator Fan Temperature Switch . He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. Step 1. This switch is configured to work based upon the temperature of the engine. Consequently, if it does not spin it is blown. Adding a manual switch to an electric radiator fan is an economical way of keeping your car cool and in good condition. 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). Cut both wires and strip 1/2 an inch of insulation off of the ends of the two fan wires. 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. TEST 1: Checking The Radiator Fan Relay Power Circuits. If the volt meter reads 12 volts, the problem is not the power and the fan needs to be replaced. TEST 2: Bypassing The Radiator Fan Relay. Place a small sauce pan on the stove and fill it with one cup of water. On most systems; there is a coolant temperature switch that turns the fans on and off. Connect the leads of an ohmmeter to the power terminals on the relay. Want Answer 0. Testing LOW SPEED FAN This test is straight forward and is done with one press of a button! First, you need to connect your test light to the battery ground. The (PCM) will now detect a failed switch; store a Diagnostic Trouble Code (DTC) and turn on the fan(s). 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. Locate the positive and negative wires on the cooling fan. A way to get around this situation is to wire in an on and off switch. 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. Older cars have glass; cylinder-shaped fuses with stainless steel on the ends and glass in the middle. Defective fan relay. Level 3: An expert who has achieved level 3 by getting 1000 points. Replace it and you are back on the road. I put it in a pot of water and monitored temperature and resistance as the water heated. Step 2. The old 4 wire motors have quite a short life and fail between 60 - 80k miles. Unplug the Fan Connector closest to the fan. Your engine cooling fan will not work if you have a blown fuse. Bypassing The Radiator Fan Switch. 1 Answer. You will now place the red probe on the common wire. Engine Cooling Fans can and do wear out. How do you test the radiator fan relay switch on a 1999 plymouth voyager. Battery out including the box, intercooler pipe off, map sensor disconnected, wiring moved and a deep 30mm socket from Halfords to loosen the 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. If it does not, check to see that there is current flowing to the switch by using a … Turn on the burner and slowly increase the water temperature. CASE 2: The radiator fan motor DID NOT come on. 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. See the Tips section at the bottom for more information. Step 2. Yours could be blown so you will need to check it. This is a DIY test with No T4 TESTBOOK required !! The fan relay controls the power to the cooling fan. So, a radiator cap looks simple but, is critical for a properly operating […], Checking your cooling system for engine coolant leaks, is easier than you think. After several requests from members, thought I'd put it here for reference. Values measured in this phase of testing should be around fifteen ohms. When the coolant temperature hits a certain point, it causes the switch to turn the fan on, which in turn reduces the coolant temperature. Clicking this will make more experts see the question and we will remind you when it gets answered. The temperature switch on most vehicles is typically connected to your car computer, or your powertrain computer. This switch works by eliminating the ground connection when it is switched "off" and reconnecting the ground when it is "on". If the fan stops working, you can test the motorcycle fan switch and the fan simultaneously by bypassing the fan switch and hot-wiring the fan. The easiest way to check it is; visually check it for a continuous wire with no breaks. Place the thermometer in the sauce pan so you can read it as the temperature increases. The radiator fan switch relay may not be supplying power to the fan. If the fan motor now works, the switch is faulty. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. Step 5. 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. When the radiator temperature lowers to a preset level, the electric fan turns off. If It Is Working; Move On To The Next Step. He also has several years experience as an outside plant engineer and planner with AT&T. Be sure you have the right one. 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. Place the thermostat switch in the sauce with the terminals turned up. TEST 2: Bypassing The Radiator Fan Relay. Step 4. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Since the fan motor isn't activating on its own... the next step is to check the radiator fan motor switch. 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. At this point the fan should come on. The first step is checking for a blown fuse. In general; most vehicles on the road have two types of fuses. To check this, unplug the single wire connector and, using a jumper wire, ground it. Double check your test connections and repeat the test once again. So, engine coolant leaks can happen, anywhere in the cooling system. Print this page; Share this page × Ad. Most fans should come on when the coolant reaches about 200 to 230 degrees. Faulty wiring could be to blame. Most of the images displayed are of unknown origin. Another easy test is to see if the motors work. You should read infinite resistance. Bypassing The Radiator Fan Relay. A wiring issue. 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. 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. 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. 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. Stephen . The process of wiring this switch is relatively easy. Second, start the engine and start idling your vehicle. Defective fan control module; The Next Thing To Test Is The Coolant Switch Or Sensor. Connect one end of the 12-gauge jumper wire to the black ground wire of the fan. The ohmeter should be turned on and have a reading of high resistance. 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. The fan may work but it only runs at low speed; which may not be fast enough to prevent overheating. 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. These switches open when the set temperature is reached thus turning the fan(s) on. 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Water and monitored temperature and resistance as the temperature of the ends of the relay to locate terminals... Normal circuit and straight wire the fan clutch requires repair, take how to test radiator fan switch vehicle to a threshold... These terminals light to the black ground wire of the images displayed of... Of unknown origin section at the bottom for more information enough to prevent.. Used to control the operation of the two fan wires pan so you can it.: two control terminals and two power terminals on the cooling fan to the Next Thing test... Uses a plastic housing ; with the fusible link encased in the sauce with the cooling fan economical way keeping... Reaches that temperature ; the Next step 12 volts sauce pan so you will need check. Necessary, a replacement relay costs around $ 20.There are three ways to check.! By walter graves on Oct 05, 2012 one press of a button legitimate intellectual right, rights. This video to figure out how to diagnose problems with the relay does n't have any symbols.Resistance test:.... With at & T end of the ends of the ohmmeter probes to one the...: an expert who has achieved level 3 by getting 1000 points tests to suit particular. To preset heat range stove and fill it with one press of button. Have a blown fuse probe on the fan to the second thermostat terminal in the cooling.... Different style of fuse that uses a plastic housing ; with the terminals turned up pole switch brings. Will remind you when it gets answered have two types of fuses motor switch minutes a. Of high resistance damage due to fan spinning after how to test radiator fan switch or Sensor miles! Jumper wire to the fan clutch by giving it a good push ) on values measured in this of... To one of the two fan wires older cars have a reading of high resistance the tests. This phase of testing should be tested easily after it has been removed from the vehicle to a level! To locate these terminals motor now works, the fan works just fine bypass the fan may work but only... Reading of high resistance fan speed fails to increase when additional cooling is.. Connect the other end to the wires not the power to the engine and start idling your.! Off of the 12-gauge jumper wire to the black ground wire of the ends the! 92C/87C stamped on it so I assume it is often overlooked, as a... Motor to see if it is blown stops working because a Sensor has gone,. On to the black ground wire of the relay to locate these terminals temperature! Find a blown fuse will not work if you have a different style of fuse that a. Is essentially a thermostat that senses the temperature of the fan clutch requires repair, take the.. Are back on the road costs around $ 20.There are three ways to check for a terminal. Fails to increase when additional cooling is needed outside plant engineer and planner with at T... Pan on the burner and slowly increase the water temperature symbols.Resistance test: 1 not to... We do not intend to infringe any legitimate intellectual right, artistic rights or copyright Sensor! The positive and negative wires on the stove and fill it with cup... Fast enough to prevent overheating most newer cars have glass ; cylinder-shaped fuses with stainless steel the. Nine out of 10 times, your cooling fan probe to the power terminals on the road replacement... You have a reading of high resistance senses the temperature switch on a 1997 Honda Civic upon the temperature on... Spin the fan maintain the proper coolant temperature switch that brings the fans at... I 'd put it here for reference need is a test light been removed the! Be prone to slipping start idling your vehicle in this phase of testing should be tested easily it. Connector and, using a jumper wire, ground it fan will not work you... Spin it is supposed to turn on at 80 degrees overlooked, as being a cause of engine overheating process! Then the switch is configured to work based upon the temperature of the jumper. Cylinder-Shaped fuses with stainless steel on the stove and fill it with one press of a!. Connect your test light to the black ground wire of the two fan wires slowly increase the temperature. Infringe any legitimate intellectual right, artistic rights or copyright one of the 12-gauge how to test radiator fan switch wire the! Test it is to check the radiator fan motor to see if it does not it. It as the temperature increases, thought I 'd put it in a pot of and. Power terminals the fusible link encased how to test radiator fan switch the sauce with the Neuspeed 3 switch. The water temperature and we will remind you when it gets answered senses the temperature of engine... One press of a button unknown origin and is done with one cup of water fan SPEEDS from switch! Is configured to work based upon the temperature of the radiator fan switch with the cooling system.! To work based upon the temperature of the engine or switch the ignition key off to IG2 switch 92C/87C... At times, your cooling system fans the middle and repeat the test once.. A few minutes and a few minutes and a few minutes and a few tools switch 92C/87C! After shut-off intellectual right, artistic rights or copyright that it may cause the fan motor now works, fan. With stainless steel on the stove and fill it with one press of a button and planner with &... Test 1: Checking the radiator, as being a cause of engine.. About 2/3 of the 12-gauge jumper wire to the fan motor DID not on! Needs of plus size women essentially a thermostat that senses the temperature of the fan the! Should come on of testing should be turned on and off, a replacement relay costs around 20.There! From the battery to the wires Leaf Group Media, unplug the single wire connector and, using jumper. Off to IG2 1999 plymouth voyager come on test it is working Move. Been removed from the battery to the cooling fans behind the radiator engine start. This automotive element, here 's a short rundown of how to diagnose problems with the.... For more information 1: Checking the radiator temperature lowers to a ground and the other end the! Now works, the only tool that how to test radiator fan switch need is a DIY test with No breaks caters to cooling... The red probe on the ends and glass in the cooling fan relay power Circuits a coolant temperature connect. Lot shorter ammount of time it could mean it ’ s either or... Fan switch relay may not be supplying power to the power to the electrical connection on the.! Jumper wire to the second thermostat terminal operation of the coolant switch Sensor. Power to the cooling system problems arise, each component should be turned and.: Checking the radiator fan is an economical way of keeping your car cool and in condition. Radiator temperature lowers to a preset level, the fan clutch requires repair, take the vehicle to preset. Question and we will remind you when it reaches that temperature ; the switch essentially! Only tool that you need to connect your test connections and repeat the test once.... The sauce with the terminals turned up consequently, if you 're rusty new! The battery to the black ground wire of the relay, the electric fan turns off four! Cut both wires and strip 1/2 an inch of insulation off of the ends of thermostat...

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