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Old 06-13-2005, 01:36 AM   #5
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Location: Downers Grove, Illinois
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Default Re: Wolfman's Guide for Diagnosing the Radiator Cooling Fan

the fan relay is directly controlled by the PCM and is only controlled by the PCM.

the PCM will turn on the fan if it sees:

the PCM is in diagnostic mode


the ECT reads above appox. 220 F
the engine is running


the A/C request is on(or for appox. 40 seconds after the A/C is turned off)
the engine is running

if the ECT never read above 193 F it is most likely bad. -40 is the standard minimum reading for all temperator sensors that i know of.


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