Question about 1999 Mercury Cougar

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Thermostat has been changed, radiator cooling fans wont kick on and the car still over heats. we checked the fuses and wiring and the fans run when direct connected to the battery. what next?

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There is probly a fan sensor mounted on the block,and a lead that will go to the brain box or relay,if you have relay.check that also.hope this helps

Posted on Jun 18, 2009

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Overheating when I sit idle.


Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

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If it does, then there is a blockage in the radiator preventing it from circulating the coolant to dump the heat. Get a Rad flush.

If the fan does not kick on, then check the fan fuse and relays, usually found in an electrical distribution box under the hood. Consult your owners manual for its location and specific fuses / relays.
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To check. start the car and listen for the fan next to the radiator to kick on. It should start running before the car gets over heated.

Also when the temp gets really high is the radiator hot? if not then you still have a coolant flow problem. If the radiator IS hot then you have a problem with the coolant not getting cooled. Either an electric fan/thermostat of if you have an engine driven fan maybe its clutch is bad.

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