guy patton wrote at 2013-02-08 01:47:13
Before you spend lots of money on grooved belts and pulleys, check the cowl drain tube. The same think happened to me,the belt came off but only in the rain. I have the 3.8L in a 98 Chrysler Town and Country. After of course checking the alignment of the pulleys and the bearings for wear, it still came off occasionally. I noticed once when the engine was idling and I sprayed too much belt dressing on the belt near the tensioner, the belt would float off the tensioner and the belt would come off the pulleys. I knew it had to be water getting in the engine compartment, but could not find it. I finally found a drain tube which directs the water coming down into the cowl vents below the windshield, and it was not in place. If that downspout type rubber tube is not in place, rainwater is allowed to pour right on top of the belt under the hood causing the belt to come off. The drain tube directs the water away from the belts and down through the engine comparment. It was a 1 minute fix, however it took weeks and months to figure it out. Hope this helps before you spend lots of money on grooved pulleys.
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