Last night I went on a late night run for the wife and suddenly the ac started blowing hot air. Now it was ONLY 98 here yesterday so at least is was after dark before it quit.

Checked the fuse and good there.

Clipped on the gauges and the high side was low and the low side was high so there was no compression.

Jumped the low pressure switch with no luck. Chopped off all of the splices looking for an open, and nothing was sticking out as bad.

Checked the 12 volts on the green wire and there was 12 volts. I then realized the pusher fan was humming away and that should have told me that I had voltage. Checked the clutch to chassis and it read a low reading. It was late, I was hot and tired so shut it down.

Tonight after the sun started to fade, I checked the clutch wire to chassis of the compressor and wrote it down, it's 3.8 ohms. Hooked the compressor clutch up to the wire coming out of harness which I knew had 12 volts on it and the clutch did not engage.

Starting to look like it was time for the new compressor, and dang it the AC has been so good for the last year. Was about the start the tear down when the bulb went on. Went inside and typed AC Clutch Resistance. And there was a post from jorrell about the compressor being grounded.

In my frustration I measured the clutch to the chassis of the compressor but did not check the resistance to the engine block or chassis. Pulled out the ohm meter and 3.8 ohms to chassis of the compressor, but it also read 78 ohms to the block.

Well that was not right, and what do you know. Scouted around and found the ground wire, and after taking it off and inspecting the connector, it was eaten up with the green gunk inside the crimp. Humidity is heck on bare copper wires down here, looked like by last set of Bosch plug wires did when they got ripped out and tossed in the refuse bin.

Installed a new heavy duty wire with shrink tubing and a good tape job over the crimps and it now read 3.9 ohms to the engine block. Redid all my slice and dice troubleshooting and got it all back in place.

When I started her up about 10 seconds later heard that click of the compressor kicking on and then the cool air started coming out the vents.

Glad I did not rip out the compressor. Called around and new compressor are $300 and was not able locate a rebuild. The idea of high 90's and the PUP has sort of lost it's appeal from some reason. Did find a place in Stafford close to where I work that rebuilds compressors with a one year warranty for $148 bucks. Was about to save the core fee of $30 by having the compressor in the trunk of the wife's car tomorrow.

Good to read up before you plunge in too far.

Regards,

Paul