Question about 1994 Ford Tempo

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Cooling fan comes on and stays on when new thermal switch in thermastat housing is plugged in and service engine light comes on

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1 Answer

My fiat Doblo cooling fan stays on when engine is switched off


A significant number of cars have an electric cooling fan supplied by a battery live rather than an ignition live because it is believed the cooling fan should be able to start or to continue running after the engine has been switched off.
Coolant will continue to circulate after switch-off due to thermo-syphon activity and it could reduce mechanical stress on engine components to continue cooling.

Some people modify the cooling system by fitting an additional manual switch to over-ride the thermal switch for use when standing in traffic, for whenever continuous operation is desired or to use in emergency should the thermal switch operation fail.

In the absence of such a modification that has been inadvertently switched on the fault will be due to a faulty thermal switch, a faulty or stuck relay or shorted wiring. Disconnecting the thermal switch should stop the fan and if it does it indicates the switch is faulty. The switch is mostly fitted into the radiator header tank but sometimes is fitted to the bottom tank or the thermostat housing.

Feb 28, 2015 | Fiat Doblo Cars & Trucks

3 Answers

I have a 2003 chevy impala. just changed the thermastat because the temperature was fluxuating. Since changing the thermastat the temperature gage constantly read in the red, however the coolant level...


You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
Allow the engine to completely cool.
Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

Dec 02, 2010 | 2003 Chevrolet Impala

1 Answer

My check engine light has been on for 2 days now and there's some sort of loud fan that starts up whenever I start my car and it runs constantly until I turn the car off. It makes it embarassing to pull up...


sounds like the radiator cooling fan is stuck on .. that normally only comes on if the radiator gets hot ... there is a thermal switch mounted on the radiator that senses the temperature and turns on the fan . if its contacts get stuck then the fan stays on ... .. in some cars there is a relay that could get stuck . the relay is operated by the thermal switch .. .

Apr 02, 2010 | 2006 Saturn Vue

1 Answer

1997 a4 se overheating.i have changed the thermostat and car is still overheating.cold air is coming from the blower.car drives perfectly otherwise.fan is not coming on.how would i diagnose the problem


Alot of time you have to bleed the cooling system after changing a thermostat it gets an air pocket in it look for a bleeder valve near or on the thermastat housing if so bleed it to get the air out.check the radiator and make sure its full because if you filled it up after changing the thermastat once the thermastat opened after the engine ran awhile well the cooling system needs refilled.

Mar 30, 2010 | 1998 Audi A4

1 Answer

Radiator Fans not working


test both fand by hooking them up to a car battery first (watch your fingers) but its more likley to be the thermal switch not switching the fans on its an easy part to swop over it just scews in to the engine block with a whire plug fitted to it that is a push fit, you cant get it wrong,

Mar 07, 2010 | 2004 Kia Optima

1 Answer

Radiator cooling fan doesn't come on.


first unplug the cooling fan at its plug and supply 12v to the fan if it doesnt run then replace if it does run follow the power wire to the thermal water switch usualy located at the bottom of the radiator.Use test light/probe to check that you have power into the switch and when engine is hot you should have power both in and out of the switch.if not replace thermal water switch.If that is working you will need to find out why you have no power to the switch.Check that your fuse and relay is working correctly.Sometimes just pulling out the relay and putting back in will make it work due to poor contact.Also try swapping relays with others in the same box near battery to identify if relay is faulty

Oct 27, 2008 | 1990 Buick LeSabre

1 Answer

Cooling fan will not work


i had to replace the relay coolent switch and the thermal coolant switch to make mine work when its suppose to and to stop it from over heating i needed to change pluggs thermastat and anti freeze and adjust timing

Jul 15, 2008 | 1992 Toyota Tercel

1 Answer

Fan cooling system of an engine v.w


A thermal switch controls the radiator fan and if the temperature of your radiator is above a preset temperature value, the thermal switch will close and the fan will turn on and will stay on even after you turn the motor off, until your radiator temperature cools down. I wouldn't worry about.

Jun 11, 2008 | 1996 Volkswagen Jetta

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