Question about 1999 Pontiac Firebird
I replaced all 3 relays & ect sensor didnt fix the problem. When ect is not plugged in fans come on what do i do next?
I think you may have a PCM problem, the fact the fans come on in "failure mode" when the ECT signal is lost indicates the circuits to the fans are ok. Technicians disconnect the ECT to verify fan operation as a quick test for checking the fan circuit and the fan motors. one last note, you do realize the fans don't come on until either the AC is on or the engine reaches approx 235 Degrees F. at idle that takes a long time.
Posted on Aug 21, 2008
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Posted on Jan 02, 2017
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