Mechanics

LIFTER NOISE

1994 Pontiac Grand Am • 145,000 miles

Suddenly getting engine lifter noise when I turn on air conditioning. It's a GM remanufactured 2.3L. Seems like it's dragging down engine. I don't use the air now for fear of engine damage. I hooked a gauge up to the low side and turned on air for a minute and I didn't see the pressure drop.
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Circutz
September 12, 2013.




Is the ac comoressor clutch engaging when turning on the ac?Does the center of the ac compressor turn freely when turning it by hand with the engine off?

Saturntech9
Sep 12, 2013.
Yes, it turns and the a/c works.

Tiny
Circutz
Sep 13, 2013.
The ac blows cold?It shouldn't if the low side doesn't drop with the ac on.

Saturntech9
Sep 13, 2013.
Problem solved. It was the a/c compressor. Noise was resonating from valve cover making me think it was lifter noise. I added 4oz pag 100 oil and noise went away. Got lucky on this one.

Tiny
Circutz
Oct 28, 2013.
Sounds like the vanes in compressor were sticking that's why the pressure didn't drop on the low side when the compressor kicked on.
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Saturntech9
Oct 28, 2013.

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