A/C Pressure Readings Out of Whack - Need Help!
My a/c hasn't worked for a few years (since I got the 87 XJ) and never messed with it until now. I checked the low side pressure and it showed zero. When I tried to add refrigerant the gauge needle shot into the red zone showing it was over charged.
I had heard that this can happen and to try for 30 seconds and see if gauge lowers. It didn't. So which reading is correct? How can I tell? The reading with both taken with the engine on. However, the compressor doesn't seem to be engaging, which I heard can happen when the refridge gets too low.
When I turn on the a/c at max, the pulley turns but the middle part (the compressor?) doesn't. Again, I was told that can happen with the refridge is low. I reseated the a/c relay but didn't change anything (i didn't clean the connections but I may just get a new one and try it).
Not sure how to tell if the compressor is bad or if there is another problem. I've heard of people jumping it but I'm not very good with that kind of thing. How do you do it?
I know I can take it to a shop but I'm trying not to spend the money unless I absolutely need too.
Any feedback would be appreciated.