Serpentine Belt keeps slipping off on 1998 Cadillac DeVille

The serpentine belt keeps slipping off of my 98 Cadillac deville. All of the pullies are fine. This is exactly what happened. I was putting coolant in and it slpashed onto the belt, immadiately the tensioner started clicking. I released the tension& put it back & it stopped. So I drove 5mi, made a right turn & the belt slipped off mid turn. I put it back on, drove another 20mi & it slipped off again & did major damage to the belt. It tore about 1/5 of the belts width off. I put the 4/5 of a belt back on and drove 25mi & it's fine. Oh, & the belt was brand new, about 5mi on it. Definitely the right one. I did notice that ever time I line the belt up & then start the car the belt always pulls to the outside edge of the pully, not the motor side. If anyone knows what the problem may be please help. I'd really appreciate it.

by in Erie, PA on April 27, 2011
3 answers 1 comment
ANSWER by on April 27, 2011
Check the power steering pully, it could be misaligned. It is pressed onto the power steering pump shaft and although the pully itself looks good, the alignment is off causing the belt to walk itself off of the balancer.
COMMENT by on April 27, 2011
I truly appreciate the help. Replaced the tensioner pully & the idler pully, as well as the alternator. I know which on is the a.c. Compressor. So that leaves 2. I'm not sure which one is the power steering pully. It's either the big one on the top left or the one right below it? Also the brand new belt that is on there has 80% of it's width. Could I just leave that on there? Also, if the belt got wet would that cause it to slide off? Again, thanks for the help, you're truly a lifesaver; cus it's real scary when that belt pops off while making a turn.
ANSWER by on April 27, 2011
Chances are the tensioner pulley is failing. The tensioner is keeping tension, but the pulley is probably the culprit. If you can physically see the belt shift when you start the engine, one of the pullies is loose causing the belt to come off.
ANSWER by on July 13, 2011
yuor belt tensioner rempase

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