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Noisy compressor, decent temps

mrbear3800 on Sat June 19, 2010 10:06 PM User is offline

Year: 2000
Make: GMC
Model: Sierra
Engine Size: 5.3
Refrigerant Type: R134a
Ambient Temp: 80
Pressure Low: 43
Pressure High: 225
Country of Origin: United States

Hello. Long story short, my compressor is noisy. It makes a sort of "whirring" or "supercharger" sound that increases in intensity with RPM. It does not seem like a belt or pulley sound to me and there is no sound present when the clutch is disengaged. It is louder with higher heat loads. Almost not noticable below 75 degrees ambient and low humidty.

Otherwise, the system seems to work well. It was 85 and humid today and I had a consistent 38F out of the center vent on the way to work today, max a/c. Performance does seem to degrade somewhat at idle, but just a tad.

I tested it yesterday. 80F ambient, low humidity. At idle, doors open, max a/c: 43/225 pressures, 48F @ vent outlet.

1500 rpm, doors open, max a/c: 33/200, 38F @ vent........

Static pressure was about 65/65.

Thanks for any info.

Edited: Sat June 19, 2010 at 10:07 PM by mrbear3800

mrbear3800 on Sat June 26, 2010 10:41 AM User is offline


Edited: Sat June 26, 2010 at 10:42 AM by mrbear3800

iceman2555 on Sat June 26, 2010 11:14 PM User is offlineView users profile

Pressures are not indicative of a fully charged system. The system should be recovered, evac'd and recharged utilizing the correct equipment to insure a correct refrigerant recharge.
The noise from your compressor is normally associated with a compressor that is suffering from lack of lubricant. The internals are operating with less than a minimum amount of lubricant. This is usually the result of a system than has lost a sufficient amount of refrigerant to reduce or stop the flow of lubricant thru out the system.

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Thomas Jefferson

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