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2002 Pontiac Grand Prix

Tiny
DILLOWLAKELAND
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 77,000 MILES
I hear a grinding noise in my engine when I reach about 5000 rpm and it only happens when my air conditioner is on. It is hard to describe the grinding noise but maybe you have run into a similar problem before, thanks for your help!
Wednesday, December 10th, 2008 AT 11:24 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
If it only happens with the AC on at 5K RPM's, I'm going to say it has something to do the the AC compressor. 5K RPM's is somewhat high and if the AC clutch is engaged and has a bearing starting to go bad, that is where the noise may be coming from.

What is red line on the vehicle?

Joe
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Sunday, December 14th, 2008 AT 1:11 PM
Tiny
DILLOWLAKELAND
  • MEMBER
  • 4 POSTS
Thanks, that gives me a great place to start. The red line
is 6k.
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Sunday, December 14th, 2008 AT 11:10 PM

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