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how to test radiator fan switch

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

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