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Jim
Grant has been working in the automotive industry for over twenty
years. In addition, Jim is an ASE Master Technician with advanced
L/1 certification. He works as manager and technician in his
family's automotive business in New Hampshire. He writes weekly
automotive consumer columns and is editor of an automotive newsletter
that is circulated throughout North America. |
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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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