Groaning A/C Noise
#1
Groaning A/C Noise
My '92 Z28 recently started making a "groaning" noise when the A/C compressor is running and the engine speed drops. (running at 2000 RPM - then close throttle to idle) - groaning noise through system heard inside the vehicle. Sounds like its coming from inside the evaporator. I replaced the expansion valve thinking it was clogging at low compressor speeds and recharged the system. Makes 43 degrees in the car but the groaning noise continues. Plenty of oil in the system and recharged to 2.25 lbs with Freeze 12. Not really that concerned about A/C but need the defroster in colder months. Any ideas or suggestions appreciated!
Thanks, John
Thanks, John
#2
My '92 Z28 recently started making a "groaning" noise when the A/C compressor is running and the engine speed drops. (running at 2000 RPM - then close throttle to idle) - groaning noise through system heard inside the vehicle. Sounds like its coming from inside the evaporator. I replaced the expansion valve thinking it was clogging at low compressor speeds and recharged the system. Makes 43 degrees in the car but the groaning noise continues. Plenty of oil in the system and recharged to 2.25 lbs with Freeze 12. Not really that concerned about A/C but need the defroster in colder months. Any ideas or suggestions appreciated!
Thanks, John
Thanks, John
Does your system not require 134a?
#4
I'm sorry.I did just scan this.I had looked at a previous post for a '95.Converting to 134a isn't that bad at all.Either way freeze 12 is still a good product.Sounds like you have a compressor going bad to me.Do you have high pressure readings?
#5
Re: Groaning A/C Noise
When the A/C compressor clutch kicks in, a solenoid is supposed to also kick in to increase idle speed. If it doesn't you will hear the compressor groan. To test this, increase the idle speed a little with the gas pedal when the compressor kicks in. If the groaning sound stops, then low idle speed is the culprit.
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autoxr166
General 1967-2002 F-Body Tech
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09-25-2015 04:21 PM