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Second, start the engine and start idling your vehicle. Most fans should come on when the coolant reaches about 200 to 230 degrees. The fan may work but it only runs at low speed; which may not be fast enough to prevent overheating. This switch works by eliminating the ground connection when it is switched "off" and reconnecting the ground when it is "on". Replace it and you are back on the road. 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. It was a git of a job. When the radiator temperature lowers to a preset level, the electric fan turns off. Locate the positive and negative wires on the cooling fan. 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 ohmeter should be turned on and have a reading of high resistance. Clicking this will make more experts see the question and we will remind you when it gets answered. 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 (PCM) will now detect a failed switch; store a Diagnostic Trouble Code (DTC) and turn on the fan(s). For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. In conclusion. I put it in a pot of water and monitored temperature and resistance as the water heated. If the fan clutch requires repair, take the vehicle to a qualified mechanic. He also has several years experience as an outside plant engineer and planner with AT&T. TEST 1: Checking The Radiator Fan Relay Power Circuits. Double check your test connections and repeat the test once again. Posted by walter graves on Oct 05, 2012. If the fan motor now works, the switch is faulty. If The Fuse Is OK Move On To The Next Step. Your engine cooling fan will not work if you have a blown fuse. Turn on the burner and slowly increase the water temperature. Place the thermostat switch in the sauce with the terminals turned up. 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. A way to get around this situation is to wire in an on and off switch. If the resistance does not change to zero, then the switch is bad. 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. Values measured in this phase of testing should be around fifteen ohms. Bypassing The Radiator Fan Relay. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. 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. Bypassing The Radiator Fan Switch. HOW TO TEST RADIATOR FAN SPEEDS FROM TRINARY SWITCH (DIESEL CDT/i, 1.8 & KV6 Variants. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. Normal voltage for a radiator fan is around 12 volts. COPYRIGHT © 2020 DANNYSENGINEPORTAL.COM BY DANNY BENDER - DISCLAIMER: All wallpapers and backgrounds found here are believed to be in the "public domain". The temperature switch on most vehicles is typically connected to your car computer, or your powertrain computer. 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. CASE 2: The radiator fan motor DID NOT come on. When the coolant temperature hits a certain point, it causes the switch to turn the fan on, which in turn reduces the coolant temperature. If one spins a lot shorter ammount of time it could mean it’s either dead or on it’s way out. The easiest way to check it is; visually check it for a continuous wire with no breaks. That may be all you need to get back on the road. Most of the images displayed are of unknown origin. Adding a manual switch to an electric radiator fan is an economical way of keeping your car cool and in good condition. The switch is essentially a thermostat that senses the temperature of the coolant. Most newer cars have a different style of fuse that uses a plastic housing; with the fusible link encased in the housing. In general; most vehicles on the road have two types of fuses. This switch is configured to work based upon the temperature of the engine. Print this page; Share this page × Ad. The volt meter will then give you a voltage reading. Turn on the burner and slowly increase the water temperature. Test The Radiator Fan Temperature Switch . 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. The first step is checking for a blown fuse. See the Tips section at the bottom for more information. However, it is often overlooked, as being a cause of engine overheating. 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). These switches open when the set temperature is reached thus turning the fan(s) on. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. Stephen . 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. 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. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. To check this, unplug the single wire connector and, using a jumper wire, ground it. If the volt meter reads 12 volts, the problem is not the power and the fan needs to be replaced. Engine Cooling Fans can and do wear out. When it reaches that temperature; the switch closes and turns the fan(s) on. 1 Answer. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. Step 5. 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