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Old 06-15-2014, 01:04 PM   #1
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GM 454 dash A/C noise:

We have a noise when ever we engage the dash a/c unit on our 1985 Winnebago Chieftain. We have replaced the compressor twice but still have the noise, kind of reminds me of a kid with a playing card flapping on the spokes of his bike. It gets louder with higher engine RPS's, but when the unit's thermostatic control cycles it off everything gets quiet. As soon as the unit cycles on the noise returns. At about 40 mph+ it gets really bad. Our RV mechanic is stumped and now wants to install yet another compressor? BTW each compressor had a new clutch assembly.

We are at our wits end trying to solve this problem.....

Folis Jones
Suffolk, VA
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Old 06-15-2014, 02:18 PM   #2
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why was original compressor changed?
Is it cooling properly?
What are pressures while running?
Was system cleaned and new dryer installed?

thermostatic control turns off power to clutch so it has to be restriction,overcharge,bad compressor,lubrication,too high of pressure.

I know this is a lot of possibilties but all are possibile.
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Old 06-16-2014, 08:35 AM   #3
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It is making the same noses it did with the two prior compressors, the mechanic says there is nothing left to change that rotates. The sound is directly proportional to the engine rpm. As you rev the engine the noise increases, and decreases as the rpm's slow down. When the system cycles off the noise stops immediately. It's as if someone had a piece of hard plastic hitting the fan blades, but we checked the fan shrouding and nothing is touching anything. All pressures are correct and it actually cools fine, it's just the noise makes you think something is coming apart. Could it be possible there have been faults with both of the last two compressors?

I'm sure with the wealth of knowledge in the group someone has experienced the same problem. Thanks to all, we have a race weekend at VIR in July where the temps run over 100 degrees ambient. The roof unit is only a couple of years old but is hopelessly inadequate. I can't believe Winnebago chose such a
wimpy unit..........but that's another issue.
Kind regards to all,
Folis
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