How do I isolate this noise?
Thread Starter
Instructor
Joined: Jul 2000
Posts: 203
Likes: 3
From: Galesburg IL
How do I isolate this noise?
I have recently developed a high pitched squealing noise in the engine compartment of my '85. The noise sounds like it is coming from my A/C compressor. Here is what I know so far.
1. The noise is most annoying when the car is first started. After a few miles of driving, the noise disappears.
2. The A/C still blows cold and the clutch engages as it should, but the noise is louder when the A/C is engaged.
3. I took the belt off and spun the compressor pully by hand. It seems to move freely and I am not able to duplicate the noise.
The noise is not as loud on the drivers side as it is on the passenger side where the A/C compressor resides. But I got to reading something in the Haynes manual that got me to thinking maybe the water pump is to blame. The manual says the water pump will emit a high pitched squealing sound when the impeller shaft bearning wears out. When the A/C is on, could the extra load cause a bad water pump to squeal worse? Any advice is appreciated. Thanks,
Steve
1. The noise is most annoying when the car is first started. After a few miles of driving, the noise disappears.
2. The A/C still blows cold and the clutch engages as it should, but the noise is louder when the A/C is engaged.
3. I took the belt off and spun the compressor pully by hand. It seems to move freely and I am not able to duplicate the noise.
The noise is not as loud on the drivers side as it is on the passenger side where the A/C compressor resides. But I got to reading something in the Haynes manual that got me to thinking maybe the water pump is to blame. The manual says the water pump will emit a high pitched squealing sound when the impeller shaft bearning wears out. When the A/C is on, could the extra load cause a bad water pump to squeal worse? Any advice is appreciated. Thanks,
Steve
Melting Slicks
Joined: Apr 2002
Posts: 2,631
Likes: 2
From: Clever, MO aka SOMO
Re: How do I isolate this noise? (steveb)
Check your idler pulley on the serpentine belt tensioner. Mine makes alittle rumbling noise for just a few minutes after I start it up, then goes away. I feel it's time to replace the pulley.
Good luck, :cheers:
Good luck, :cheers:
