2001 SLS ...water pump belt broke
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2001 SLS ...water pump belt broke in Past Cadillac Vehicle Discussion; Hello, I noticed for a while my car was leaking coolant. It never overheated but just had to be refilled ...
  1. #1
    bld0702 is offline Cadillac Owners Member
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    2001 SLS ...water pump belt broke

    Hello,
    I noticed for a while my car was leaking coolant. It never overheated but just had to be refilled a lot. It seemed to be coming from drivers side, kind of in the middle. A few days ago, it began to overheat immediately. I noticed the water pump belt was snapped and the pulleys were melted. Obviously, these will need to be replaced. My question is, if the water pump itself is bad, would it cause the leaking in that area? It didnt really seem to come from direct area near the water pump, but a little further up than that. Near the overflow tank, but more in front of that lol. I am trying to get idea of what all I should replace.

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    Submariner409's Avatar
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    Re: 2001 SLS ...water pump belt broke

    The water pump drive tensioner pulley froze, overheated the belt, which killed the plastic (metal hub) drive pulley TIGHTLY PRESSED onto the left intake cam extension. Special tools and puller to get it off and on.

    Many hoops to jump through. Pulleys at www.rockauto.com. Puller/installer either rented from large parts store or use a power steering puller kit from NAPA or Harbor Freight.

    Tutorials down in Cadillac Tech Tips. Pictures and diagrams in my albums. Google "cadillac forums northstar water pump drive pulley replacement" and other related topics, always preceded by "cadillac forums .......".

    FWIW, the water pump drive tensioner pulley is a weak spot in the system - mine got noisy at 56,000 miles, so I changed it. Dry bearing. $25 as opposed to $225. 30 minutes as opposed to all morning. Pictures in my albums.

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    bld0702 is offline Cadillac Owners Member
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    Re: 2001 SLS ...water pump belt broke

    thanks!! do you think that a bad water pump caused this since i was experiencing a coolant leak beforehand?

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    Submariner409's Avatar
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    Re: 2001 SLS ...water pump belt broke

    Probably not - exactly where the leak is/was is the determining factor in that equation.

    These systems can leak at the w/p, the w/p cover, the water crossover left gaskets, the bottom of the reservoir, the stamped metal thermostat retainer spigot - all within 10" of one another.

    Go up ^^^^ to the narrow dark blue bar - click Community, Albums. Go through the two red Seville albums - LOTS of water system stuff in those .

  6. #5
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 2001 SLS ...water pump belt broke

    the leak has nothing to do with the broken belt -
    like Sub already said -
    the broken belt was probably caused by a seized idler/tensioner pulley -

    pressure test the cooling system to find the leak -

    you can "rent" - for free - a pressure testing kit from autozone -
    or other big auto parts stores -

  7. #6
    bld0702 is offline Cadillac Owners Member
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    Re: 2001 SLS ...water pump belt broke

    Thanks a lot! I will do the pressure testing kit. I sure hope it is something easy!

  8. #7
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: 2001 SLS ...water pump belt broke

    probably the surge tank cap not holding pressure.Mike

  9. #8
    Submariner409's Avatar
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    Re: 2001 SLS ...water pump belt broke

    Quote Originally Posted by mike5514 View Post
    probably the surge tank cap not holding pressure.Mike
    Mike - Post #1 - the water pump belt tensioner froze, melting the drive pulley and the drive belt broke, overheating the engine. We need to fix that mess, then find his leak.

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