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.... now I'm hearing strange noise from the compressor... $%&^!!!!
I took it to a shop. He had me turn it on, and hooked up pressure gauges. Read about 9 o'clock on the low pressure and 11 o'clock on the high pressure. I'm now looking at that on Townsend's page... my symptoms most closely matched the last case.. "slight cooling of discharge air, foam in sight gauge...refrigerant is low caused by a slow leak"
Ok, well that's what the mechanic said too. We left the system running and fed in some R-12. He put a little over a pound in until he said it was good. Actually we kept feeling the cooling air, and stopped when it felt sufficiently cool...not entirely scientific, but hey, A/C was working, I was happy. Anyway, so we put a pound in, I paid him $50, and he said to give it a try and see how it goes.
On the way home, cooling is good, but whenever the revs got to about 2500, I heard this buzzing whirring like sound coming from the compressor area. It's a low pitched rumbly type buzz/whirr. Turn off A/C, it goes away. When I turn A/C back on, the noise is there for a sec at startup, then goes away, until I rev back up to 2500. A couple times while cruising at ~2700, the clutch cycled off and noise went away. When clutch cycled back on, noise came back.
When I got home, parked in garage, opened hood and listened. When I turn the A/C on, hear the noise, then it goes away... a constant very high pitched whine remains as compressor runs. Actually I hear this high pitch noise w/o A/C on, but it's louder with it on. Called mechanic and told him, he says bring it back tomorrow to take another look.
Is it possible that the system was overcharged and that's causing it to make noise? Townsend mentions a "knocking rumbling noise or vibration" with overcharge, but also says warm air, which I don't have. Air is good! Extra load on compressor stressing the bearings or something? The mechanic turned the compressor with engine off before adding R-12 to check it.. could that have damaged it? Compressor coincidentally dies? I doubt it...
sigh....
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