When AC is switched on, grinding noise can be heard

Tiny
DANISHSIDDIQUI
  • MEMBER
  • 2007 CHEVROLET OPTRA
  • 196,000 MILES
I own a Chevrolet Optra Manual 1.6 L. When I switch on the air conditioner, I can hear a grinding noise coming from somewhere in the engine. On pressing the clutch, I can feel the vibrations. Have got the throttle body replaced on the mechanic's suggestion, but it has not helped.
Do you
have the same problem?
Yes
No
Sunday, June 30th, 2013 AT 1:02 PM

8 Replies

Tiny
SEANGRANT00
  • EXPERT
Hello,

Have you had any work done to you air conditioning?

This could be a couple things,
-Your A/C is overcharged
-Your compressor clutch is bad or about to fail
-Condinsation Drain (rare)
-If the noise is closer, blower motor or air door problem

Let me know

Sean
Was this
answer
helpful?
Yes
No
Sunday, June 30th, 2013 AT 11:13 PM
Tiny
DANISHSIDDIQUI
  • MEMBER
Hi Sean,

Thanks for your prompt reply.

I just bought this from a friend of mine. It's been over 2 months, but, this AC problem was there since the start. Earlier the car would always shut down the moment I would start the AC so I never noticed this noise. For now, the mechanic managed to set the RPM a bit high, so at least it doesn't shut down. However, there is this grinding sound which is a bit scary. I really don't know what to do with it, cos the garage guys are a piece of junk here.
Was this
answer
helpful?
Yes
No
Monday, July 1st, 2013 AT 3:26 AM
Tiny
SEANGRANT00
  • EXPERT
This could be a couple things, how cold is the air coming out?

It could be a low amount of oil in the system, which is causing more friction. It also could be a bad clutch or compressor. The bearings in the compressor could also be going out. See if you can push on the clutch and see movement or play. This would indicate a bad bearing.

Sean
Was this
answer
helpful?
Yes
No
Monday, July 1st, 2013 AT 4:24 PM
Tiny
DANISHSIDDIQUI
  • MEMBER
I can feel the grinding whenever I press the clutch. Looks like i'll have to get the bearings checked.
Was this
answer
helpful?
Yes
No
Tuesday, July 2nd, 2013 AT 5:09 AM
Tiny
DANISHSIDDIQUI
  • MEMBER
However, one thing confusing is why does RPM go down the moment AC is switched on?
Was this
answer
helpful?
Yes
No
Tuesday, July 2nd, 2013 AT 10:21 AM
Tiny
SEANGRANT00
  • EXPERT
Normally any addition of a load to the engine will bring the RPM's down. The computer typically raises the idle to balance this out. In your case, the bearings going out would put a higher load on the engine. When you get this fixed it should go back to normal.

Sean
Was this
answer
helpful?
Yes
No
Tuesday, July 2nd, 2013 AT 1:58 PM
Tiny
DANISHSIDDIQUI
  • MEMBER
Great ill let you know
Was this
answer
helpful?
Yes
No
Wednesday, July 3rd, 2013 AT 10:15 AM
Tiny
SEANGRANT00
  • EXPERT
Sounds good

sean
Was this
answer
helpful?
Yes
No
Monday, July 8th, 2013 AT 12:11 PM

Please login or register to post a reply.

Recommended Guides