Hi new here just got my truck a few weeks ago. It is a 2001 Silverado Z71. When I got it my power steering went out so I had to replace the power steering pump. Since then I have had a squelling coming from the belt or a pulley. I put a new belt on did not help. I put on a new tensioner pulley and a new idler pulley and those did not help. It is fine at idle but if I give any gas it is a constant squel. If I let off of the gas it stops. This is driving me crazy. I don't even want to drive the truck because it sounds terriable. What else can I do?

Thanks, Mike

 

in my old 89 my ac compressor was the cause of a bad squeal. had rev 'er up to here it. pulled 1 from the junkyard and put it in problem solved. my a/c never worked anyway.

 

true my 89 did the same squel...sometimes it's hard to tell since it's a serp system and it's turning multiple pulleys..welcome and good luck ....keep us informed on your search for the fix

 

ac compressor works fine and the air blows ice cold.

 

TSB

Accessory Drive Belt - Whining Type Noise

File In Section: 02 - Steering

Bulletin No.: 01-02-32-007

Date: September, 2001

TECHNICAL

Subject:

Accessory Drive Belt Whine
(Reposition Power Steering Pump Pulley)

Models:

2001-02 Chevrolet and GMC C/K 1500 Series Utility Models
(Tahoe, Suburban, Yukon, Yukon XL, Denali, Denali XL)
Built at Janesville Assembly Plant (Plant Code J)
from December, 2000 through July, 2001

Condition

Some customers may comment on a whining-type noise that is audible in the vehicle's passenger compartment. This noise can typically be heard when the vehicle is idling and may vary in pitch as engine RPM is increased.

Cause

The power steering (PS) pump pulley may be positioned too far inboard on the PS pump.

Correction

Inspect the PS pump pulley for proper positioning on the PS pump shaft. If it is determined that the pulley is not even/flush with the end of the shaft (+/- 0.25 mm (0.010 in) following the applicable Service Manual procedure and using J 25034-C, reposition the PS pump pulley.

 

this Diagnosis is cheap and easy.

fill a spray bottle with water, start vehicle and spray water onto the different pulleys, etc:

when you hit the one that making noise, the noise will stop for a minute or two, then return,

have used this method a number of times and it normally works well.
water will not damage the belt or get sticky stuff on you pulleys.

You may have dirty pulleys, someone may have sprayed belt dressing onto the pulleys, if so you will need to take belt off and clean each pulley, then buy a top quality belt
example: gates or gatorback.

good luck and let us know what you find!!!!!!!!!!!

 

Well I fixed it. I just put the old belt back on and it stoped squelling. So I guess I need to go and buy a gates belt instead of the cheap belt I bought.