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I have a 04 Dakota w/3.7L. The serpentine belt comes off on a regular basis when I'm in really wet weather. Its usually due to driving through roads that are collecting a lot of rain. I have changed the belt multiple times but it seems to do the same exact thing. The last time it happened, I pulled over immediately and found it had just slipped off the fan pulley. This is where the smooth back side of the belt is running against the pulley. I think if it had a lip on the back side of the pulley, it would fix the issue. Has anybody had an issue with this before? Any ideas?
 

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Yes, I have, albeit not on a Dakota.

Turns out my harmonic balancer was coming apart.

Also, check ALL the idlers and tensioners for parallelism; I used a yard stick to verify that this and or that was in line properly.

RwP
 
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