I have 91 RS that is basically stock with a 305 and 224,000 plus miles. A few weeks back the AC quit working. I thought it was the relay mounted by the blower motor so I bought a new one to replace the burned up one (which was burned up) but no luck. The AC system was replaced with new parts about two years ago, new compressor and dryer. I also replaced the plug for the relay by the blower motor about three years ago because it was burning out relays.

Heres what I have found out so far. The new relay itself is good, I checked it out by trying it in place of the fan relay by the brake master cylinder and the fan came on. If I jump the main power wire (purple I think it is to the red) on the plug by the blower motor it will come on, I can also jump the wires at the plug to make the clutch on the compressor engage. But with the new relay in place nothing happens.

Also, a while back I was having similar issues and while fooling around I jumped the plug on the front of the compressor and somehow everything worked again. Then it quit again on me. After messing with this plug for a while I got it to work again and all was well for about 6-7 months until recently. I have checked all I can think of, fuses, relays, voltage, continuity, but somewhere there is something I am missing and if anyone could give me any advice or help I would really appreciate it.

I have also posted this in the electrical section as well.

Thanks, Chris