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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!!
Make sure all the electrical switches are plugged in and have good connections.. If you missed the low pressure cut off switch, it will not engage the clutch. Same with the high pressure switch.

1949 International KB2, 302/T5
1968 Dodge Dart GTS, 340/727
2006 Dodge Magnum R/T "SRT Design"
2016 Dodge Durango Limited
 

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Discussion Starter · #3 ·
Make sure all the electrical switches are plugged in and have good connections.. If you missed the low pressure cut off switch, it will not engage the clutch. Same with the high pressure switch.

1949 International KB2, 302/T5
1968 Dodge Dart GTS, 340/727
2006 Dodge Magnum R/T "SRT Design"
2016 Dodge Durango Limited
Thanks for the reply.
I went back through and checked all the connections and cleaned the contacts. No change. I suppose the switches need to be tested next?
 

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Thanks for the reply.
I went back through and checked all the connections and cleaned the contacts. No change. I suppose the switches need to be tested next?
That's where I would start. Make sure the compressor is getting power. To check the pressure switches, the easiest way is to use a small piece of wire and jump across the terminal (bypass the switch temporarily). If the compressor works then you know it's a problem.

1949 International KB2, 302/T5
1968 Dodge Dart GTS, 340/727
2006 Dodge Magnum R/T "SRT Design"
2016 Dodge Durango Limited
 

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2016 Durango R/T Arizona
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....unless you have low or high pressure already.
 

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....unless you have low or high pressure already.
I'm assuming that's not an issue, but yes it's something to check

1949 International KB2, 302/T5
1968 Dodge Dart GTS, 340/727
2006 Dodge Magnum R/T "SRT Design"
2016 Dodge Durango Limited
 
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