A/C Blowing Hot Air - Freon Now Charged, Compressor Not Engaging

[campbmic]

Update*****
I lowered the Freon pressure to the normal 45 and now the compressor will not kick on. Since this is so convoluted I'm going to start a new thread. Please use the new one. Thanks

Update*******

So its acting very strange now. When I turn the A/C on the compressor will kick in for about 2 seconds stay off for about 5 seconds, then kick back on.

I hooked up my Freon gauge and this is what happens. The pressure starts at 35 then steadily climbs up to 70. Once the pressure hits 70 the compressor kicks on for 2 seconds and the pressure drops back down to 35.

This just repeats over and over. Still no cold air



I have a 2003 Yukon Xl with 130K. I took it to a shop today and they said the AC had zero freon and that could be the problem.

1. Freon: Charged the Freon up to around 35 PSI
2. Compressor: AC compressor IS NOT SPINNING. However, I can spin it freely by hand.
3. Fuses & Relay: Checked AC fuse and its suppose to be a 10 but it has been replaced by a 30. The 30 fuse is still good. Looked at the relay and it was pretty beat up, so I swapped the horn and the AC relay.

To me it looks like there's something preventing the AC compressor from getting turned on. If the compressor was fried and needed to be replaced wouldn't it be locked up?

How can I tell if the AC compressor switch is working? I have a multimeter if that helps!

 

[campbmic]

I tried to "jump" the AC compressor switch as described in this video:

Nothing happened

 

[campbmic]

Edit***** OK so I disconnected my compressor from the wiring harness and jumped it directly with a positive and negative wire and it fires up!! So that tells me something in the wiring harness is preventing the compressor from getting juice.

Any help?

Update again*******

So its acting very strange now. When I turn the A/C on the compressor will kick in for about 2 seconds stay off for about 5 seconds, then kick back on.

I hooked up my Freon gauge and this is what happens. The pressure starts at 35 then steadily climbs up to 70. Once the pressure hits 70 the compressor kicks on for 2 seconds and the pressure drops back down to 35.

This just repeats over and over. Still no cold air

 

[Bowzer]

1) find leak
2) fix leak
3) pull vacuum
4) weigh in charge

 

[mizzouguy]

^^^ you should always charge by weight. Had a similar issue with my 04 and messing around with psi via a cheapo gauge. I had a friend with a ac machine, hooked it up and vacuumed the system down, changed drier and orifice tube while I was in there, pulled vacuum again, and refilled with the correct amount by weight and it works great.