Jim Grant's Tech Tips
‘96 Chevy
Lumina Van, A/C Knock
Q: I have a ‘96 Chevy Lumina Van with a
3.4 DOHC. My concern is when the A/C is on the engine makes a knocking
type noise. This noise appears to be coming from inside the engine and
goes away when the A/C is turned off. The engine's idle or driveability
isn't affected by this knocking. Could this be the beginning of something
bad?....Jason
A: I
have no reason to believe that there is an engine problem. The first item
I’d suggest checking would be the A/C compressor or the mounting bracket
for the compressor for loose bolts. If either has loosened up, it doesn’t
have to be by much, a knocking noise can occur when the A/C compressor
is on. If the compressor and mount are tight then the A/C compressor itself
would become suspect.
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