1993 ford escort over heating - fan not work

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Old 01-27-07, 02:46 PM
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Unhappy 1993 ford escort over heating - fan not work

After driving the car for a while it over heats and the fan does not turn on.
I unplug the temperature sensor and the fan starts working, then I disconnect the cooling relay and the fan stops working, so I guess the relay works fine.
I have replaced the temperature sensor and the fan still does not turn on.

Any ideas would be appreciated

locuas
 
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Old 01-27-07, 03:37 PM
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Have you tested the wiring from the sensor to the fan?

Actually, the temp sensor goes into the PCM so disregard the wire to the fan.

I would lean more towards the PCM (Powertrain control module).
 
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Old 01-27-07, 04:09 PM
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would probably make sure your coolant level is full and see about having the vehicle hooked up to a scanner where they can monitor the coolant temp and diagnose why the fan is not coming on, its possible an engine with a headgasket or head problem may appear to be overheating blowing coolant out of the overflow when in fact the temp isnt even high enough for the pcm to turn on the fan.
 
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Old 01-28-07, 04:44 PM
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How do you know it's overheating? You may have a non-problem.

I had a Tracer from that era, and I too thought it had an overheating problem. Turns out it took a long time until the cooling fan came on. The temp gauge would need to go to the halfway mark before the cooling fan would kick in. I only found this out after spending money on a circuit diagram and half a Saturday working on this issue.
 
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