AC compressor clutch engagement
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AC compressor clutch engagement
My AC compressor clutch is engaging every 4-5 seconds whenever the selector is in either AC position, as it should, but also when in vent or heat. It does not engage in OFF or defrost. Does this seem normal to anyone else?
Thinking further, I remembered that the temp lever was in the cold position in all settings. I'll double check what happens with the temp set higher.
Thinking further, I remembered that the temp lever was in the cold position in all settings. I'll double check what happens with the temp set higher.
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Re: AC compressor clutch engagement
Anyone have an idea?
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Also, it doesn't matter where the temp is set.
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Also, it doesn't matter where the temp is set.
Last edited by icarus402001; 09-17-2007 at 07:06 PM. Reason: Automerged Doublepost
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Car: basic third gens
Engine: that I like
Transmission: to restore
Axle/Gears: and enjoy
Re: AC compressor clutch engagement
It shouldn't run with HEAT or VENT, but it should run with DEFOG. Don't know what the problem would be though. Also, the compressor shouldn't cycle that often unless the outside temp is cool or cold. Probably low on freon.
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Car: 1983 Camaro Z/28
Engine: LU5 305 CFI
Transmission: 700R4
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Re: AC compressor clutch engagement
If the A/C clutch is cycling like that then you have low pressure in the refrigerrant lines.There is a low pressure switch in the receiver/drier to protect the compressor and the high pressure switch(if there is one)is in the compressor itself.As 86blackiroc stated the copressor should run in defrost setting also for humidity control.
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Re: AC compressor clutch engagement
If the A/C clutch is cycling like that then you have low pressure in the refrigerrant lines.There is a low pressure switch in the receiver/drier to protect the compressor and the high pressure switch(if there is one)is in the compressor itself.As 86blackiroc stated the copressor should run in defrost setting also for humidity control.
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Car: 1984 Trans Am
Engine: 305 H.O. 4bbl.
Transmission: 5 speed manual
Axle/Gears: 3.73 Posi
Re: AC compressor clutch engagement
I have an 84 Trans Am doing the same thing. A/C was working last season, so probably a tiny leak. If I recharge with a can or R-134, how high should I bring up the pressure? According to the gauge that came with the R-134, 55 psi is the max safe range, but the compressor keeps cycling on and off every few seconds. I somehow recall hearing/reading somewhere that the R-4 to R134 switchovers in these vehicles require more pressure than many systems. Any truth to that? So bottom line, does anybody know what to charge pressure to at approx 80 degrees F ambient temperature? Thanks.
If the A/C clutch is cycling like that then you have low pressure in the refrigerrant lines.There is a low pressure switch in the receiver/drier to protect the compressor and the high pressure switch(if there is one)is in the compressor itself.As 86blackiroc stated the copressor should run in defrost setting also for humidity control.
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