HELP! 1999 SLS Coolant leak
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Northstar Engines and System Technical Discussion Discussion, HELP! 1999 SLS Coolant leak in Cadillac Engine Technical Discussion; I'm a weekend mechanic... I had a coolant leak and was told that I should replace the water pump. I ...
  1. #1
    06204d is offline Cadillac Owners Member
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    HELP! 1999 SLS Coolant leak

    I'm a weekend mechanic... I had a coolant leak and was told that I should replace the water pump. I did (very easy installation). Now it appears that I have a leak further back (towards transmission). I crawled under car but could not find the source. Please advise what in this area would leak coolant and can a weekend mechanic repair it?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: HELP! 1999 SLS Coolant leak

    Where "towards the transmission"? Between the engine and firewall? Or by the trans on the drivers side?

  4. #3
    06204d is offline Cadillac Owners Member
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    Re: HELP! 1999 SLS Coolant leak

    If I had to guess, the way the fluid gathers, I would say by the transmission on drivers side

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: HELP! 1999 SLS Coolant leak

    Water crossover gasket(s) or heater circuit supply quick disconnect fitting. Maybe a leaking throttlebody heater coolant fitting - part of the coolant purge flow system pre-2000.

    www.alldatadiy.com

  6. #5
    06204d is offline Cadillac Owners Member
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    Re: HELP! 1999 SLS Coolant leak

    Wow! Thanks. Is this labor intensive?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: HELP! 1999 SLS Coolant leak

    Oohhh yeah! The crossover manifold that is. That said, the '99's are not known for it like the 2000+ engines.

  8. #7
    06204d is offline Cadillac Owners Member
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    Re: HELP! 1999 SLS Coolant leak

    I'll check it out. Thank you guys for your help! Really appreciate it. After installing the new water pump, I thought I was home free. Oh, well...

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