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Old 04-24-2013, 12:21 AM   #1
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Default A/C problem

I am trying to put freon in the system and the compressor wont stay on long enough to pull the freon in. Isnt there a low pressure switch in the system somewhere that you can bypass/override to keep the compressor engaged? I know there is a leak somewhere and the freon has the UV dye in it so I can locate it but I need to get it in there first.


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Old 04-24-2013, 05:46 AM   #2
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Yes, somewhere on your lines is a pressure switch that you can unplug and maybe jumper with a paperclip. But you need to find out first where its at.
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Old 04-24-2013, 08:40 AM   #3
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there should be enough pressure in the can to get some in without the compressor on and its easier to find leaks with the engine off. spray around fittings and joints with soapy water in a spray bottle between that and listening you can usually find it
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Old 04-25-2013, 01:58 AM   #4
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There was enough pressure to get about half a can in then it stopped. I found one pressure switch but itjustturned the fan electric ciiling fn on and off. The other switch on the dryer didnt turn the compressor on either.

Is there a place on line that i can fnd a wiring diagram for GM vehicles?

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Old 04-25-2013, 05:39 AM   #5
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ALLDATAdiy.com Leading Source of Factory Automotive Repair Information should have the schematics you need.

But if jumping the switch up near the dryer isn't cycling the compressor on, you may need to look elsewhere. Unless the switch itself is bad.
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Old 04-26-2013, 01:29 AM   #6
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Thx for the link. I jumped the switch thats on the back side of the dryer and the compressor didnt come on. When I first start it, the compressor comes on for a few seconds then switches off then it just starts switching on and off pretty fast for a few more seconds then just stops coming on at all. According to the scanner the control panel is sending the signal to the compressor but its not coming on. Guess its time to start chasing wires and components now.

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Old 04-26-2013, 05:41 AM   #7
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If you can, find a way to apply 12volts directly to the a/c clutch itself and monitor the clutch itself.
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