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Coolins fan dosent turn on when car reaches operating temp but will turn on when a/c compressor engages any idea??

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Are you aware that the fans don't turn on until about 230 F? what this means is under normal conditions the car will idle a long time before the fans switch turns the fans on, the temp guage will be about 2/3 of the to the overheat zone, the reason they run them so hot is for fuel mileage and better emission control from the engine, it doesn't harm the engine in the least, let me know if this is not the case nd you have a actual overheat.

Posted on Nov 07, 2008

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Cooling fan motor does not engage while idling


If the fan runs when the ac is on, you can assume the fan motor and relay are ok. The temp sensor signals the computer when the engine reaches 220 degrees and the computer grounds the fan relay to power the fan.
You would need to check the operation of the temp sensor and verify the engine temp, usually with a scanner.

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My 2003 ford focus stalls out when i turn on the defroster or the air. the fan never comes on to cool the engine. we tried to find the temp sensor but we couldnt find where its located


You may have a locked up compressor. The fan only comes on when temp reaches 225 on high speed. Your low speed fan operation is controlled by the resistor that is between the two fans at the top. The connector usually melts and you will need to get two heavy duty female spade connectors to repair it.

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Fan relay not working , fan keeps going on and off wont stay running


One of your fans works off the coolant temperature sensors input and will only engage when the coolant temperature reaches and/or exceeds a certain preset degree. The other runs off of your a/c compressor and when it engages so will the auxiliary or secondary cooling fan. Start the engine cold, turn on the a/c and listen for the secondary fan to engage then as it warms up listen to see if the primary fan engages. when it reaches running temperature. Please rate me on this answer.

Jun 08, 2010 | 1998 Pontiac Bonneville

1 Answer

A/c compressor won't engage and the cooling fan not operating


I have the same car. The cooling fan activates at 227F. Only one fan will engage at this temp, the other one[closer to the A/C compressor] won't engage unless the A/C is working. Try charging the system with half a can of refrig. It'll be tough retrofitting to R-134A, the LOW PRESSURE connector is under the air box pointing sideways about an inch from a large bracket. Try and find a 90 degree adapter of some type and go from there.

May 15, 2010 | 1989 Oldsmobile Cutlass Supreme

1 Answer

The radiator fan dosent run. i changed the relay


Does it not run at all? Or does it only run after the fiero gets really hot (like sitting in traffic on a 90 degree day)?


But a low-temp fan switch (sensor), which causes the fan to turn on at a much more reasonable level. I think the stock switch doesn't turn on till it reaches 235 degrees or something.

The switch/sensor is located near the top of the engine (on passenger side end of engine area, opposite end of the throttle body).

Buy it here (or other places have them too)
http://www.rodneydickman.com/n20.html

You should be able to see where it installs by matching up the new part with the old, pretty easy operation. A little coolant might squirt out, so only do this when the engine is cold.

Hope this cures it

May 07, 2010 | 1986 Pontiac Fiero

1 Answer

A/c compressor won't engage and the cooling fan not operating


The cooling fan does not come on until the engine temp reaches 229 degrees. it is controlled by a cooling fan relay. Cheeck for power at the fan motor and check the relay. The A/C. If yuor a/c system is low on freon the low pressure switch on the accumulator will not complete the circuit for the clutch. Check the charge, voltage present at the clutch or the low pressure switch. You can install a jumper in place of the switch to test.

Mar 29, 2010 | 1989 Oldsmobile Cutlass Supreme

2 Answers

On my 2000 Jimmy when I'm at low speeds in the city it usually blows quite warm out of the heater (not always). But suddenly it will quit blowing any heat at all. On the highway it just blows cold. The...


Hello. First, it is probably that the clotch in the coolin fan isn't working. When the coolin fluid is warm, the temperatur put it in work, and the fan works rapidly, when the temperatur lows, the clotch loose the fan an is waiting the warm up again. But your Jimmy don't have the coolin fan in the principal belt, it have an electric coolin fan. In that case, your problen is for a low level of coolin water, or the relays of the electric fan don't work properly.
Finaly, my english isn't good, because I speak in spanish, but if my bad english solves your problem, i'm geting so well. I working every day in electronics cars, and that is the basic metod of analyse that I use.

Dec 21, 2009 | 2000 GMC Jimmy

1 Answer

2000 jeep radiator fan


Hi micro0711, the fan (which I assume is electric) works off of 3 corresponding pieces of equipment: the rad,the thermostat and the coolant temp sensor so if you have a 180 deg thermostat the coolant would circulate through the engine and generate heat once the coolant temp reaches approx 180 deg the thermostat opens the coolant temp sensor signals the fan to engage removing the heat from the radiator cooling surface maintaining a safe operating temp. If you find your temp is rising check to be certain there is power to the fan and also that the thermostsat is operating,hope this helps good luck

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2 Answers

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I 'am having the same problem with my '94. From what I hae read they each have their own relays but I have been unable to find them.

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