Neither of the front or rear cooling fans cone on when the AC is on (or when hot). The cabin blower motor has all 3 speed settings and seems to blow fine. The AC compressor is not working either.
I tested the cooling fan relay by hooking the battery and heard the "click". I also tested the other two pins to continuity when closed. Worked fine. I also jumped the tow fan wires that the relay would close and the fan started to spin (although my paperclip jumper got hot. Lots of amps there :) Just for kicks I also switched the relay with another and still no fans.
I think everything is pointing to the PCM (ECM? Same thing?) Control module. I was also reading that the relay wires would be "hot" and that the PCM would ground the relay when the fans were to come on. I looked for voltage between both of the relay wires and the chassis, but neither was "hot" and they appear to be an open circuit.
This is my mothers car and a few weeks ago it simply would not start. She had a neighbor help out and ended up replacing the ICM and then received spark. I think there was some experimenting that may have been done in the process that took out the cooling fan portion of the ECM.
Does this sound viable?
Thank you, Dan
Monday, October 25th, 2010 AT 5:59 PM