Question about 1993 Ford Taurus

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Cooling fan will not come on until the car is really, really hot! The fan DOES work and IF it's unplugged from the temp. sensor the fan WILL WORK continuously?? It's NOT the thermostat.

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  • sargeantlane Jul 16, 2009

    I have already changed the temp. sensor. No effect other than the $40.00 I paid for the sensor!!!!

  • sargeantlane Jul 16, 2009

    Where is the other sensor? The one I've changed is the temperature sensor and for the life of me I don't have the foggiest idea where to find the other. I'm a retired army medic and never spent much time in the motor pool!!!! Thanks

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  • Ford Master
  • 2,200 Answers

Hi Sarge!

Firstly - it is normal that the fan will run all the time with the temp sensor unplugged and is a sign that the fan itself is operating properly. The electric cooling fan should operate when engine temperature has reached between 195 to 215 degrees f. The fan operation is usually controlled by a temperature sensor located in the radiator or on the engine. When the temperature of the coolant exceeds the switch's rating (as stated typically 195 to 215 degrees F), the switch on the sensor closes and energizes a relay in the engine compartment that supplies voltage to the fan.

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. If the fan does not come on at the expected temperature, 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.

Other possible reasons why the fan is not operating until car is very hot.

1) The new temp sensor is faulty (happens even with new ones) or incorrectly fitted - solution - replace faulty sensor

2) There is a blockage in the cooling system and hot water is only reaching the temp sensor after the car has overheated elsewhere - solution - remove radiator and flush through both radiator and engine cooling paths.

3) There is an airlock in the cooling system which is having the a similar effect of delaying heated water at the temp sensor - solution - remove radiator/header cap and allow car to tick over for 15 minutes which has the effect of pushing any air out of the system.

Hope this helps. Please remember to rate my answer. Many Thanks.

Posted on Jul 17, 2009

I would replace the intake air temperature sensor, which is directly reading the outside air temp as it comes into the intake manifold

Posted on Jul 16, 2009

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  • Master
  • 3,230 Answers

Hi there,

The temperature sensor for the climate control or the control module itself may be faulty so that it causes problem. try changing the sensor and let me know what happen.......

post further comments for more information...
Good Luck!!

Thanks

Posted on Jul 15, 2009

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