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In trying to diagnose an inoperative HV blower fan, I've found that the fan relay (#7 in the diagram below) is tripping when it makes contact with the chassis (fuse block mounting post). The fan works as it should (incl. switching on/off) when either 1) when the relay is not in contact with a chassis ground (unmounted), or 2) when it is mounted but the relay ground wire is removed from the fuse block mounting post.
The A/C blower motor is not similarly effected, it works all the time like it should. It is not effected by any of the above scenarios.
I have limited electrical diagnosis skills at best, any ideas what could be causing this?
I will mention in case it's related that though the A/C blower is working fine, the rest of the underhood A/C components are currently out of the car. Not sure if that's creating an open circuit of some sort.
Garrett
The A/C blower motor is not similarly effected, it works all the time like it should. It is not effected by any of the above scenarios.
I have limited electrical diagnosis skills at best, any ideas what could be causing this?
I will mention in case it's related that though the A/C blower is working fine, the rest of the underhood A/C components are currently out of the car. Not sure if that's creating an open circuit of some sort.
Garrett