Hi from Hot Texas!

I had my 78 out for a little run over the weekend and it was 105 degrees outside. My A/C System (which I had recently replaced) was keeping me comfortable - not icey cold like my C6 but Still cool. Well low and behold - the fan just shut off.... I was still 30 Miles from home. I was not happy... especially since I had just rebuilt the entire system... including the A/C Control Unit in the Cockpit.

My question is this - what is the best way to test which component is causing the issue without buying the Relay, Resistor, Blower Motor, A/C Control Unit, etc... I did have a spare relay but it did not do the trick so I don't think that's it. My Compressor does come on when i turn on the A/C but the fan won't blow.... Is there a way I can test whether it's the fan switch on the A/C Control? Or the Resistor under the Hood? Or the Blower Motor itself? I can tell that replacing the blower motor will not be fun since i have to remove the Coolant expansion bottle and what a pain that is.

Any advice as always is greatly appreciated

Cheers ~ Joe

 

Hey Joe

Did you check for power, at the fan, with the fan switch in the on position? That's where I would start and then work my way back to the the switch.

 

Did the blower quit on all speeds or just High? If just High, then I'd suspect the relay.