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Electric cooling fan is not coming on. It doesn't seem to be getting power. The fuse is good.

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After checking the fuse, the first thing to look at is the thermostatic switch. This is located in the radiator 'bottom' tank and has two wires attached to it. Disconnect these terminals, and with the ignition on, touch the terminals together. If the fan starts, the thermostatic fan is faulty and needs replacement. If this does not work, take leads straight from the battery to the fan and see if it works. Polarity does not mater for a short while, you only want to see if it turns.
If it does turn now, reconnect everything and then check the relay and this can only really be done by fitting a known working relay. If this still does not fix the fault, you will have to start tracing and inspecting wires and connectors.

Posted on Apr 07, 2011

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The engine Temp gauge got real close to "H"but went down soon as i got rolling.Also engine cooling fans not coming on. even when i engaged AC. the fans are electric. . .?


The reason that you drive and engine cools down is that cool wind is blowing in the grille in front of the car and when you stop, that natural wind stops cooling it down.
First check the fan fuse. If it is OK check the fan itself: just apply wires on the connector of the fan and attache it to the battery (dont mix "+" and "-") If fan will not start, replace the fan motor. If it starts check for the Fan Motor Relay
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Oct 27, 2015 | 2008 Ford Escape

2 Answers

Air conditioning


please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:
  • Defective temperature switch or coolant sensor
  • Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
  • Failed fan relay
  • A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
  • Bad fan motor
ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

Jun 11, 2013 | Cars & Trucks

1 Answer

Ck engine light problem on 2001 Impala


Well the code is for the circuit - the computer commands the relay to turn the fan on and it doesn't happen.
The computer provides the ground for the relay.
If you have replaced the relay and the fan and the fuse still blows, I would look for a problem in the harness between the fuse box and the fan, including the ground circuit for the fan.
The fuse for the cooling fan is usually a 30amp marked "cooling fan" in the fuse box in the engine compartment.
Do you know what the 25amp fuse that is blowing is for ?

Jul 30, 2012 | Chevrolet Cars & Trucks

1 Answer

The fan on my 2004 Grand Prix quit working 2 weeks ago. Checked fuses and that doesn't seem to be the problem. Any ideas?


if its the cooling fan at the rad then your talking about then if you disconnect the plug on the fan and run jumper wires to it directly from the battery it should run.also check the plug connection to make sure its in good condition and no corrosion.if you jump the fan motor and it doesn`t run tap the motor it should run either way if it doesn`t then the cooling fan motor needs replacing.

Nov 03, 2011 | 2004 Pontiac Grand Prix

1 Answer

I have a 94 mustang with an electric fan. The fan works perfectly when i start the car and its cold. when the temp of the water gets up to about 185 the fan kicks on . it can idle all day and the fan works...


is the car running hot? some cooling fans never come on going down the road because the air comjng through the front of the vehicle keeps the car cool enough that it doesn't need to come on. but if it is overheating then you may want to check the cooling fan relay.

Jul 19, 2011 | Ford Mustang Cars & Trucks

1 Answer

Air conditioner in my 2004 volkwagon passat blows cool for a few minutes than blows warm. I had dyed ran through for leakes, recharged and filled with freon and that didn't seem to fix it. Help


You need to check and see if the cooling fan (electric) on the radiator is coming on. If this fan does not come on the high side pressure will go over 400psi and turn off the compressor until the press. drops. either the cooling fan motor is bad, the cooling fan relay or the fuse for the cooling fan relay. you can check the cooling fan by removing the cover of the power steering reservoir and pulling the wiring harness out from under the bracket. the fan has two wires in its connector, one red and one brown (there may be a tracer color on either one) these two wires are heavy gauge, like #10. unplug the harness and feed power to the connector on the fan side and see if its spins. If it works your problem is probably the fuse or relay. If it doesn't it may be seized or stuck or burned out. Reed, Aquidenck Motors

Jun 20, 2011 | 2004 Volkswagen Passat

2 Answers

My car runs fine everythiing seems good, just had a new radiator put on it, but when my car sits running for awhile it starts to overheat, then i start to drive and it cools back down?. please help


Check the electric cooling fan. There will be a sensor on the engine to tell it to turn on. The electric motor itself may be defective, and lastly, there will be a fuse to power the motor. Also, if the engine has been running hot, it may have damaged the thermostat. But from your description, that doesn't seem likely. Hope this helps.

Apr 19, 2011 | Pontiac Grand Prix Cars & Trucks

2 Answers

My electric fan wont come on.


First check the fuse,then check to see if the coolant level in the radiator is low,then if you can check the cooling fan relay,and the cooling fan motor to make sure it is good,if all this checks out fine,then replace the coolant sensor,and bleed the cooling system of all the air in it.

Jul 20, 2010 | 2001 Chevrolet Cavalier

1 Answer

My 2002 Montana Van will over heat while idling, once I start driving the temperature gauge will come back to normal. I checked under the hood and the coolant in the reservoir is boiling and the electric...


These fans should turn on at about 220 degrees, give or take a couple, and then turn back off at about 210 degrees.Fans should also come on when engine is idling with the a/c on [provided the a/c works of course] If the fan[s] isn't running and the gauge is over about 3/4 of the way or will go all the way to the end then odds are your fan's aren't capable of working for some reason. The classic symptoms of a cooling fan not working are what you are describing: Cools fine at highway speeds, overheats at slow speeds. I would start by checking the cooling fan fuses located in the underhood fuse panel. I believe they are marked Cooling fan 1 and Cooling fan 2 and both should both be 30 amp fuses. If the fuses are good then you might have problems with the fan motors themselves. Hope this helps you get it working again!

Jul 15, 2010 | 2002 Pontiac Montana

1 Answer

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Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay (under the dash, I believe). Hope this helps... ;-)

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