Last week I saw refrigerant wafting away from under my hood and hot air blowing in the cab. I took a look today and see a clean spot in front of the compressor behind the pulley. I tossed my gauges on lo and behold I had 100 psi on both gauges. I put on my backup gauges and it read the same. So I decided to do a vent test and nothing but air with a bit of oil came out of the low side with air and more oil out of the high side. The compressor never turned either. Any ideas what might have happened?

 

You have 100 psi on both the low and high ports and the compressor is not turning it sounds as though you have an electrical connection problem to the compressor clutch. The pressure on both sides will be the same when the clutch is not turning. 100 psi static may be a little low but probably in the ball park.

At 90 degrees ambient the low side should be about 35-40 psi and the high side should be about 190 - 225 psi.