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Discussion Starter #1
I am stumped. 97 thunderbird 4.6. cooling fans run at high speed continuously while engine is runniing. I have the climate control switches off, engine temp is cool and not warmed up. Checked temp sensor, ccrm, high and low AC pressure switches. AC clutch does engage properly when AC is turned on and the AC works. What else could it be? Thanks
 

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If the PCM ECT sensor is faulty the high speed fan will default to on full-time (there are at least two). How did you check the sensors, and which one did you check?
 

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Hate to admit it but just replaced the ECT sensor (grey) with a new one. Did not check the green (gauge sensor). Is there another one?
 

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The ECT one is the one that controls the fan indirectly. There MAY be a third one - the CELO - but again, it doesn't affect the fans.

So the ECT didn't help, and the fans are on high all the time?

Next step is to check the IRCM and see if it's shorted. For that you'll need the wiring diagram (read: Time to spring for an EVTM). Also time to invest in a multimeter or at least a test light so you can check things instead of just throwing parts at the car.

RwP
 

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Here is the 1997 Thunderbird CCRM & cooling fan diagram:

 

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Discussion Starter #6
Thanks for all the help and diagram. Turned out to be a faulty PCM. Replaced it and everthing is back to normal.
 
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