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2004 3/4 ton front end squeal

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Ticked off
New User

Apr 20, 2007, 8:32 PM

Post #1 of 3 (1944 views)
2004 3/4 ton front end squeal Sign In

2004 GMC 2500 crew cab: This truck has an intermittent front end squeal when in motion. Dealer says it is the power steering pump (used for brake assist).
The squeal does stop when you take your foot off the gas.
4 power steering pumps later, and the squeal is still there.
Any ideas?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 21, 2007, 6:51 AM

Post #2 of 3 (1941 views)
Re: 2004 3/4 ton front end squeal Sign In

I think it's safe to say it's not the PS pump itself.

A possibility is the belt or the tensioner. A DIY check would be to just with engine at low speed then raised while NOT in motion would be to hit the brakes while steering back and forth. Don't just wail on the end travel of the steering. That test would put a monster load on the PS pump and belt. If it objects and makes the noise the belt tension may be inadequate. Engine off and cool, just look at the belt and what percentage of the PS pulley gets direct contact then feel the longest span of the belt to see how much deflection you get.

Belt tensioner may be at the end of its zone or range of self tensioning. Even if new it may be a noisy one. I've replaced belts that had but a few miles on them with different brands because of noise but were the correct size. Gates and Dayco to name two do market belts specifically to be quiet. If the percentage of the pulley for PS is less than half the tension will need to be strong.

A spray of WD-40 on the belt ribbed surface may shut it up for a while which strongly points to probems as mentioned. You can't change the percentage of the PS pump pulley but the correct size "quiet" belt with proper tension should do.

I find most intermittent noises from belt come from the alternator. They can give a squeel when you just start it up or when you raise engine speed off idle with a load on it like blower fan full, RWD on, headlights on will cause it to work hard.

If you are a diyer potentially make sure you have the diagram under hood for belt routing if you do take it off. Some are nasty to figure out by guessing but can be done.

Hit back with what you may find as I want to know and others would benefit also, T

Ticked off
New User

Apr 21, 2007, 8:29 AM

Post #3 of 3 (1939 views)
Re: 2004 3/4 ton front end squeal Sign In

Thanks for the info.
I will get back to you in a couple of weeks as I am leaving for holidays today.
Thanks again.
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