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07:55:10 - 04/20/2024
V8 Dakotas
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Greeno
Dodge Dakota
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3/18/2002
11:42:38
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 Subject: A/C compressor spinning without A/C on?
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Message:
Had a question. I have a 2000 4.7L Dak. I have been hearing this compressor activating sound while driving with JUST THE HEAT on. So one morning, right after startup, checked it and found that the front part of the AC compressor pulley intermittently spins for about 2 seconds and stops. That is the sound that I have been hearing. Now, let me get this straight. I thought the a/c compressor spins only when the A/C is ON, which in turns, puts a drag on the drive belt?? Right?? So why is it turning with merely the vent on hot,with the blower motor on? IS THIS NORMAL? THanks. If not, it's going to the dealer with the warranty.
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QUADMAN
Dodge Dakota
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3/18/2002
12:06:54
|  RE: A/C compressor spinning without A/C on?
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The compressor is coming on, it's suppose to. It's designed to come on mostly with the defrosters to kill the humidity in the heated air so it won't fog up the windows. The a/c compressor I know comes on with the defroster, does on almost all new cars now but I'm not sure as to whether it does or not on other heating selections. Hope this helps.
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Dan Gruber
GenIII
3/19/2002
12:41:50
| RE: A/C compressor spinning without A/C on?
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Message:
Mine comes on at AC, Max AC, defrost, foot and defrost, and the foot/face blend, all regardless of where I have the temp knob set.
I looked at the service manual on this. Don't quote me because the manual wasn't totally clear, but I think the compressor will cycle on and off periodically just to maintain proper system pressure. But then again, I almost never hear mine. So yours might be a little low on refrigerant, or maybe the pressure relief valve is faulty and is letting too much pressure vent. Again, the manual wasn't clear on exactly what conditions will cause the compressor to come on and off, but it did say that the compressor will cycle on and off to maintain proper system pressure.
Just a guess, but I hope it helps.
Dan
2000 CC SLT 4.7 4X4 Auto 3.55 LSD
3 inch Performance Accesories lift & 32 inch BFG MT KM's
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Greeno
Dodge Dakota
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3/21/2002
10:06:16
|  RE: A/C compressor spinning without A/C on?
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Message:
Hey Thanks guys. I checked it out and it only seems to cycle on and off during the defrost, defrost and heat, and A/C settings. With just heat from the foot area, it didn't cycle. I really don't mind either way but the fact that it could be robbing gas mileage and the noise with it bothered me. I'll have them check the noise level next time i'm in there.
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