2002 chevy impala fans will come on for 10 seconds intermittantly, do not come on when ac turned on. will run at high speed when ECT disconnected. what could be problem. PCM and BCM tested good.
I have a 2002 impala 3.4l engine which the cooling fans come on for 10 seconds intermittantly. When ECT removed both fans come on high speed, replaced ECT, all 3 fan relays, and fan assy. PCM and BCM tested good. Fans do not come on when A?C turned on either. What could be wrong?