Question about 1989 GMC S-15 Jimmy

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One of the pulleys that the serpentine belt goes over has broken off. I think it may be the water pump but not sure. belt is loose. can I bypass that and use a smaller belt or is some sort of repair needed?

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  • Jeremy W.
    Jeremy W. Dec 30, 2010

    If you bypass the water pump how will the engine stay cool? It will run for about 10 to 20 minutes and then the engine will overheat and then eventually seize. The water pump is behind the pulley that the fan is attached to. If you grab the fan and you can move it around a lot than the water pump is probably bad. If not it should be pretty obvious is something else is broken or out of place.

    The serpentine belt is held tight by an automatic belt tensioner. It is the part on the passenger side of the motor.

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  • Master
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You should fix the broken pulley especially if it is the water pump. If it is in fact the water pump and you bypass it, your engine will overheat and you could cause serioius damage up to needing a replacement engine.

Posted on Dec 30, 2010

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My air conditoning compressor is making a grinding noise and it hasn't worked for years. Is there a way to change the pully on the water pump and just put a new serpantine belt on to bypass the compressor?


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I have the same car and last night my belt slipped off. The top small pulley backed it's self out. The problem is in most cars the pulleys are reverse threaded so this wont happen, in ours not so much. The pully spins loose with the turn of the belt so it has to be tightened way down. IT's a pain. Here is a diagram I found and You need a 15mm wrench, which doesn't just come in most sets. Good Luck

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