Chevy & GMC Vans

when i start van in the morning i get a whining nois after a drive and it heats up it stops making noise . Changed tenshion pulley and belt cant realt tell where the noise is comming from.

Chinnesse, my 89 Astro developed a whining noise from the engine also. It turned out to be the bearing in the idler pulley. Autozone offered a replacement idler assembly for around $20, which isn't bad, but I removed the idler assembly from the engine and then removed the idler pulley itself from the idler arm. I found that the bearing was bad that is pressed into the pulley. Fortunately, the bearing part number was clearly visible on the bearing. It was a simple matter to get a new bearing--I think it cost around $5--and replace the bad one. If you find it's the idler bearing and want to replace it, take note that the pulley bolt that fastens the pulley to the arm is left hand threaded, or at least it is on my 89. I used a socket and my bench vise to press in the new bearing.

Thank for reply Safari Bob did that already and even swaped out pulley by it self changed belt to its driving me craze cant tell where noise is comming from. Tring to see in anybody has had this problem before .
1998 Safari 117000 ](*,)

If you take the belt off & run the engine (for a min) does the noise still occur?
Try pinpointing the source of the noise with a stethescope or a section of rubber hose to your ear.

I followed what James posted above and found the bad tensioner on my van.
When the belt was off an all was quiet while running the engine, I knew I was on to it. But I didn't think to check the tensioner at first and was wondering what the noise could possibly be after checking the other pulleys.

No noise with out belt changed belt and tenshion pully and idler pulley tried to track doun with thetescope just cant pin point it . the wierd thing after it warms up it stops making noise thinking might be ?

Another tool is a long bladed screwdriver to test for sound.

Are you using a stock s-belt or the cut s-belt (Gatorback type)?

stock

As others have mentioned, it could be the tensioner and/or pulley.

Noises are not all that hard to track down. It takes patience and the ability to focus at a section of the engine and LISTEN to where you are looking.

When I switched to the Gatorback type of belt, it eliminated ALL belt noise, no matter if it is hot/cold/damp/wet/dry.

Disclaimer: I am not referring to listening to rearend noises. Rearend noises are very difficult to locate the source depending on the number of guys in the area. It does not matter how many women are in the area since they do not emit rearend noises.

=D> found out that the belt sold by pepboys and advanced auto was causing the noise bought a belt at a local dealer of parts and went away.

Water Boy wrote:
Disclaimer: I am not referring to listening to rearend noises. Rearend noises are very difficult to locate the source depending on the number of guys in the area. It does not matter how many women are in the area since they do not emit rearend noises.

Good to hear that you got the problem solved Chinnesse. =D>

=D> =D>