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how to test radiator fan switch

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