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Discussion Starter · #1 ·
2004 5.7 w/ rear A/C controls

I replaced my A/C compressor and condenser, now the compressor clutch won't switch on. The previous compressor stopped working, but the clutch would still switch off and on until the clutch bearings failed and it jammed.

• Fuse #24, fan clutch, in the power distribution box was blown, so I replaced it. I assume the fuse blew when the previous clutch failed, but I didn't check it then so I don't actually know for sure. The replacement fuse is still good now, even with a smaller (10A vs. 15A since I had one handy) fuse, but I haven't tried to run it for a long period of time.
• Relay #34, fan clutch, gets hot to the touch so I tried swapping relays around and whichever relay is in the A/C position gets hot, and if I put the A/C relay in any of the other positions it works fine.
• If I remove the relay and jump it with a lead, the compressor clutch engages, I get cold air, and it seams to run for a while (10-15 minutes) without problems.

Any ideas where to check next before I take it to a shop. (Electrical diagnosis is my weak spot!)

Thanks for any help!!
 

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2004 5.7 w/ rear A/C controls

I replaced my A/C compressor and condenser, now the compressor clutch won't switch on. The previous compressor stopped working, but the clutch would still switch off and on until the clutch bearings failed and it jammed.

• Fuse #24, fan clutch, in the power distribution box was blown, so I replaced it. I assume the fuse blew when the previous clutch failed, but I didn't check it then so I don't actually know for sure. The replacement fuse is still good now, even with a smaller (10A vs. 15A since I had one handy) fuse, but I haven't tried to run it for a long period of time.
• Relay #34, fan clutch, gets hot to the touch so I tried swapping relays around and whichever relay is in the A/C position gets hot, and if I put the A/C relay in any of the other positions it works fine.
• If I remove the relay and jump it with a lead, the compressor clutch engages, I get cold air, and it seams to run for a while (10-15 minutes) without problems.

Any ideas where to check next before I take it to a shop. (Electrical diagnosis is my weak spot!)

Thanks for any help!!
Dunno if you have fixed this yet but have you tried to jump the low pressure switch?
 

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Discussion Starter · #3 ·
Thanks for the reply. The pressure switch is a 3 wire switch, and I'm not sure which wires to jump, (and don't want to fry anything). Any tips?
 

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This may seem dumb but is there enough refrigerant in the system to start the compressor? Maybe there is a leak somewhere.
 

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Discussion Starter · #5 ·
I've been known to miss something obvious once in a while :)
But the system was empty, we evacuated it and charged it by weight based on the sticker under the hood. And it seems to hold pressure fine.
 

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The relays you move around are they all exactly the same one, there should be a number on the top of them. If you can jump it then it works and probably is a relay or possible ground issue. Maybe there is corrosion in the plug in where the relay goes. Relays can be expensive so if you have a junk yard around you should be able to get a bunch for pretty cheep to just to test. The button in the truck could be bad as well. If you had a scanner like a Autel ms906bt you can cycle the ac with it to narrow down the issue to a button or switch, that's what a shop would probably start with. These are all guesses but trying to give you some ideas.
 
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