Question about 1991 Audi 90

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My coolin fan doesn't kkick on when the engine heats up an my car wants to shut off what can be the problem?

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Bad relay to fans usually causes this and if computer is shutting it down over heating issues then means it's reading correctly from the coolant temperature switch meaning that's working. Given that the computer wants to shut it down and knows it's hot should mean it's sending the signal for the fans but no results because relay. Easier to determine if you have twin fans because if the fan motor was bad only one would not work.

Posted on Sep 02, 2010


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Why would the engine temperature remain in the normal range for a couple of hours and then overheats when idling?

Check to make sure both of the electric fans are working. Your car has two cooling fans. As the engine begins to warm up one of the fans will come on. When the engine gets near or above normal temp the other fan will cut on. When you are driving, there is enough air moving through the radiator to keep the engine within normal range. When the car is stopped the fans are needed to draw enough air through the radiator. When the engine is hot and running, open the hood and look to see if both fans are turning. Keep your hands away. Just look don't touch. If neither fan is spinning, or if only one is spinning, you probably need to install a new fan assembly. But check for blown fuses or relays. Have someone check to make sure power is being sent to the fans when they should be spinning.

Jul 27, 2014 | 2006 Dodge Charger

1 Answer

My car overheated and cooling fans not turning on

therr are two cheap sensors for both the coolin &AC fans,( i had same problem) take the wires off of one switch at a time while car is runnin & put jumper on wires n tie them together, if fan cmes on switch is no good

Nov 13, 2012 | 1995 Honda Accord

2 Answers

I have a 99 alero 3.4 changed the heads and it is still over heating I don't know what else to do if you have any ideal plz let me know

You need to check your entire cooling system, radiator, hoses, water pump, everyting, make sure notthing is leaking. Check your oil to make sure it's not milky, if it is, you've got a bad head gasket.

Apr 21, 2011 | 1999 Oldsmobile Alero

1 Answer

Front heating and coolin fan only works on speeds 3, 4, and 5.

there is a relay behind the glove box, replace that and all speeds will work again

Jun 22, 2010 | 2003 Chevrolet Tahoe

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 Lincoln LS overheatjng with ac on. My coolin fan is not speeding up when i turn on my ac it runs the same

HI, there are three devices that control fan operation and speed as well. i recommend inspecting these three components for there operational value. test thoroughly and check the wires as well. if you detect any faults within these three devices, replace immediately. I will list the parts to inspect and there respective definitions as well.

Problem spots to inspect--

1.Inspect the Cooling fan switch-- The cooling fan switch on electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When engine is warm, the switch closes to turn fan on for cooling.

2. Inspect the Cooling Fan Control-- This module Reads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.(controls actual speed as well)

3. Inspect the Temperature switch-- A bi-metal, heat activated, switching device that controls an electrical circuit based on engine metal/coolant temperature. It controls the cooling fan(s), temperature light or gauge, fuel mixture, emissions controls and electronic-control unit functions. It's usually made of brass or stainless steel and uses a tapered pipe thread (NPT) for dependable sealing. replace if faulty.

You will find the problem in one or all of the above discussed areas.

Please rate and god bless:)

May 04, 2009 | 2000 Lincoln LS

1 Answer

Car running too hot

you might check to see if they have power going to them .. if not you might even have a bad relay which is under the hood in the power distribution box.. under the lid of this box is a diagram telling you which one is which... also put the thermostat back in it will actually help .. when your engine reaches say 180 the fans are suppose to come on.. thanks Jerry holler if you need more ...

Apr 25, 2009 | 1998 Oldsmobile Intrigue

1 Answer

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

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.

Nov 07, 2008 | Mazda MAZDA3 Cars & Trucks

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