3 speed A/C???
 

The A/C three way switch has never worked for me in the 3rd or high position. I replaced the switch a few weeks back thinking that was the problem, didn't solve a thing. I'm hoping/ asuming that it is the relay any thoughts?

Where is the fan switch relay located in a 1972 C10?

Thanks

Re: 3 speed A/C???
 

The high-speed fan relay is on the far right of the heater/AC box inside the cab--between the kick panel and the box. I don't think you have to take out the glove box insert to get to it, but if it was out you'd be able to look right down at the relay. Replacing the relay should fix your problem.

Re: 3 speed A/C???
 

Thank you for the information...

Re: 3 speed A/C???
 

Also make sure this is plugged into fuse panel:
(run=runs, sorry)