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Fan will not come on,hot light comes on

No voltage is getting to fan

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There is a plug in on the radiator which should have to wires that should be the sending unit for the fan it is likely bad. the fan will not run if it is not working. if u unplug it and put a jumper wire to connect the two termonals on the wire side the fan should come on with the key on if it does then u know there is power and the switch is bad

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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My fan on my 2001 mercury cougar won't come on at all. How can i test it to see if they are working or if i have a bad relay?


This is a partial fan wiring, I'm just trying to show the fuse and relays. That fuse circuit is hot all the time. not only check the fuse, check voltage on fuse circuit, hot all the time, use a test light.
Check for applicable trouble codes, Your coolant temp sensor is involved. On the load side of high-speed relay, the left side in picture, use proper size jumper wire, between the two terminals with relay unplugged, if the fuse is good, voltage, the fan/s should run? If they run, at least the fan motor is working and ground for the fan should be ok. If it runs with jumper, the problem is on control side of relay, either voltage or ground.
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Installed a new switch in a bedroom that was not controlling the light or the hunter fan. ( fan and light both work by utilizing the chain)For some odd reason after installing the new switch and testing it...


That's exactly what you should get. When the fan is on a voltage reading across the two terminals will give you 0 volts and when the switch is off you should get 120V _ or -. Reason being when its operating you have current flowing so the potential or voltage across the terminals will be the same on both sides therefore you will get 0 volts. When its off the current is not flowing so there is no voltage drop across the switch so the hot side is at 120V while the other side is at 0 volts and you get a reading of 120V because voltage is a reading of potential deffernece between 2 points in the circuit.

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Engine fan does not come on after replacing relay switch


Bypass the relay with a piece of wire, (preferably fused). This means: Remove the relay and put the piece of wire in place of terminal 30 and 87 in the cavity where the relay lives. Even if you don't use a fuse all you are doing is giving the fan the same voltage it would be getting if the relay was closed. If the fan doesn't come on then leave the jumper wire in place and smack the fan motor with something like a screwdriver handle or small hammer with the voltage applied and see if that makes the fan come on. (Stuck fan- replace fan). All electrical diagnoses should come from the relay. It gives you the input and output for the fan. The input is 12v hot on terminal 30. This usually this is constant hot wire from the main buss line on the fuse box. The 87 terminal goes to the fan itself so that the output of this terminal will be a grounded motor waiting for voltage. The 86 wire on this relay is normally fed through the fuse box via the fuel pump fuse and gets voltage when the ignition is turned on. The 85 terminal on the relay is the field ground and energizes the relay. This wire comes from the switch which in this case is the computer or ECM. When the engine gets hot the coolant temperature swich sends a signal to the ECM to ground the relay terminal 85 which colses the points of the relay and allow power to travel from the 30 terminal to the 87 terminal. this gives power from the 30 terminal to the fan at the other end of the 87 terminal. the grounded fan receives this power, begins to spin and cool the engine. By the way relays have a failure rate of about .015% so the problem probably isn't the relay itself. Joe
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My fan wont work.when the engine is hot.


First check the fuse in the engine compartment relay box. If not the fuse, you will need a 12 volt test light (or voltmeter) to troubleshoot, as there are several possible reasons. With the engine hot and running, pull the connector off the fan and use your test light to see if there is voltage in the connector. If there is voltage, replace the motor. In no voltage, move on to the relay. pull the relay out of the socket (in the same box as the fuse). If it clicks when you pull it out, your wiring to the fan is bad. If it doesn't click, try switching it with a similar relay. If a different relay clicks when put in the fan relay socket, your fan should now be coming on. If neither relay clicks, interrogate the relay socket with your test light. Put your clip on a chassis ground point and probe the terminals into the relay socket. If 2 of the sockets light up the light, the system is trying to throw the relay. If not, the likely problem is the PCM or the coolant temp sensor, which is read by the PCM. Hopefully you don't get to this point, as I assume your temp gage is working. Let me know if you have questions.

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1 Answer

The cooling fan isn't coming on and the car keeps running hot


With the car running and hot, pull the connector off the fan and use a test light to see if there is voltage at the fan connector. If there is voltage, replace fan. If there is no voltage, find the fuse and relay in the relay box there under the hood, Check the fuse and try swapping the relay with another similar relay. Also use your test light to check for voltage on the terminals in the socket. There should be 2 hot terminals when the engine is running and hot. If not (only one hot terminal), the control module is not turning the fan on. If there are 2 hot terminals to the relay but no voltage at the fan connector, replace the relay. If you have questions, please reply.

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1 Answer

When the car sits idle the tempature gage goes way up. As soon as the car is moving again the temperature lowers to its normal range. I thought replacing the fan relay may solve the problem


Yes, but first check to see if the fan is working. If the fan is not coming on when the eninge is on and hot, check for voltage at the fan motor connector using a test light. If no voltage, the relay or fuse is likely problem. If there is voltage, replace the fan instead.

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1 Answer

My acura 3.2 tl overheat when is very hot and I noticed that only one radiator fan is working, is the fan broken or the thermostat is not working properly?


This requires troubleshooting. You would need to test for voltage at the fan connector with a test light. If you have a test light, test the connector. If the light comes on, the fan is bad. If the light doesn't come on, the fan 2 relay is bad. If you don't have a test light, you can buy one at the auto parts store for a few dollars. If you have more questions, please let us know.

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1 Answer

Way would the car run hot when iam only in park or while iam driving at a slow speed


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First use a test light and make sure you are getting voltage to the fan with the ignition key on and the ac selector in on position.If no voltage check fuse in fusebox or (in linefuse ), If fuses are good check the fan relay switch. If all are good check for broken wire or bad ground.If you are getting voltage to the fan motor or the test light lights up then chances are you have a bad fan motor.

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