How's your engine coolant level? If you've got a water pump leaking coolant, your belt will squeak, as the pump will leak the coolant directly onto the belt. You'll see the spray pattern under the hood if it's been going on for a while.
Coolant level seems to be good. Including the reservoir.
Two other things come to my mind at this point: When the belt is squeaking again, STOP the engine, and pull the belt off. Start the engine back up and see if the noise is still present. If it is, the problem has nothing to do with the belt or any of the accessories. If the noise does stop, put the belt back on. Grab a can of WD-40 or Tri-Flow, or equivalent spray lube. With the belt reinstalled and the engine running, spray a small amount of lube first on the inside (ribbed side) of the belt, and then the outside (smooth side) of the belt. If the noise stops by spraying lube on one side or the other on the belt, the belt is most likely the culprit. Other thoughts; make sure the pulleys are all correctly lined up- if there is a pulley in the line that's just a little too far forward or too far backward, that can cause belt noise as well. If the noise stops with the belt off, spin all of the pulleys (engine OFF) by hand to see if any of them are making any noises. This will help find a pulley that may be misbehaving. Also check to see if any of the pulleys are wobbling or bent.
Also... pay close attention to your idler pulleys. Those have been known to make some noise when the bearings start to go out.
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SOURCE: installing accessory belt on 94 Buick P/Ave ultra.
You must press on tensioner to make room for new belt. The tensioner then re-traps and keep belt tension when new belt in on. So in other words you have to put belt over all othe pulley leaving tensioner for last using a 3/8 ratchet with out a socket (just the square end) in the hole thats in the tensioner pushdown/up to make room for belt to slide on. If the belt seems short make sure that it is routed the correct way. Good Luck get back to me if you need more help and leave me a "rating". Thanks
SOURCE: How do you replace the serpentine belt on a 2000
there is a pic under the hood that showes the corect way to run the belt. over and under diferant pulleys. figure out the corect way it goes and use a breaker bar to pull the tenchenor so you can slide the belt on, then let go slow and your done. the soring holds the pulley at the exact right tension. you can do this it's not that hard... good luck
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SOURCE: replace 2000 buick park ave serpentine belt
Firt - study & write down (draw) the belt path,,
and be sure about it..
Then - put a wrench on the nut in the center of the tension pully.. Move the tension pully to loosen the belt.. Pull belt off..
Repeat to put new one on..
Should be pretty easy..
SOURCE: how do i install serpentine belt on a 1998 buick
Testimonial: "Thanks for taking time to answer my ?, but I'm wondering do I have to remove pessenger side motor mount to install serpentine?"
SOURCE: how to replace serpentine belt for 98 buick park
there is a tensioner pulley with a place to put a ratchet loosen tension and remove make sure you have a diagram to put belt back on if not draw a picture before removing
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VERY GOOD SUGGESTIONS! Will try all and get to you. Thanks for your help on this annoying problem.
When a squeak is heard you should remove the belt completely and briefly run the engine to see if it was coming from an accessory (power steering, water pump, idler, etc.).
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