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Old May 14th, 2018, 7:32 PM
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First off, my apologies if I am posting in the wrong section. Iím new to the forum so hold on tight. I have a 2005 Chevy 2500 6.6L. Last year the AC worked but would freeze up and stop blowing, then eventually thaw out and work again. This year it doesnít work at all. I put a test light on the compressor plugs and had no power to the compressor. I donít know whether or not to replace it or if itís an electrical issue somewhere. All the fuses are good. Any thoughts would be appreciated!
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Old May 14th, 2018, 9:26 PM
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if the system has low pressure...the low pressure switch will open and not allow the compressor to turn on
you could briefly (to long and the compressor will be damaged) jumper the low pressure switch...if it engages the compressor...have the system recovered, charged and leak tested.

how were you able to confirm the evaporator froze up?
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Old May 15th, 2018, 3:39 PM
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Originally Posted by tech2 View Post
if the system has low pressure...the low pressure switch will open and not allow the compressor to turn on
you could briefly (to long and the compressor will be damaged) jumper the low pressure switch...if it engages the compressor...have the system recovered, charged and leak tested.

how were you able to confirm the evaporator froze up?
all the lines and evaporator were covered with ice. Iíll give that a try and let you know
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Old May 15th, 2018, 3:44 PM
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That is indicative of low freon charge, and since it is a closed system, you have a leak.
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Old May 15th, 2018, 4:02 PM
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Originally Posted by kevinkpk View Post
That is indicative of low freon charge, and since it is a closed system, you have a leak.
Ok, Iv tried putting Freon in it but it says itís full. Should I just go ahead and drain the system? Do would I go about finding the leak?
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Old May 15th, 2018, 5:45 PM
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Originally Posted by okstate31 View Post

Ok, Iv tried putting Freon in it but it says itís full. Should I just go ahead and drain the system? Do would I go about finding the leak?
Ok, what say's it's full? If the system is full, freon isn't the problem.
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Old May 15th, 2018, 6:08 PM
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Originally Posted by kevinkpk View Post
Ok, what say's it's full? If the system is full, freon isn't the problem.
Just hooking the hoses up, gauge says itís full. Is it normal to not have power to the compressor? Like I said earlier, I took the plugs out and put a test light on them and there was nothing
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Old May 15th, 2018, 7:18 PM
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Originally Posted by okstate31 View Post

Just hooking the hoses up, gauge says itís full. Is it normal to not have power to the compressor? Like I said earlier, I took the plugs out and put a test light on them and there was nothing
Actually like you didn't say. You can put gauges on static, you should read same across the compressor. If the system has a charge that will allow the compressor to operate, then start systematically troubleshooting where you don't have power to the ac clutch.
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