Leaking Coolant Somewhere
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Cadillac STS Forum - 2005 through 2012 Discussion, Leaking Coolant Somewhere in Past Cadillac Vehicle Discussion; Hey all, 2006 Cadillac STS V6 1SC - 80k miles. I've been leaking coolant very slowly, but it seems to ...
  1. #1
    kschwed is offline Cadillac Owners Fanatic
    Automobile(s): 2006 Cadillac STS 1SC
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    Leaking Coolant Somewhere

    Hey all,

    2006 Cadillac STS V6 1SC - 80k miles.

    I've been leaking coolant very slowly, but it seems to have recently become more noticeable. Today, actually, my car told me to check the coolant level and it was about an inch below the full mark. Last time I added coolant was probably two months ago - 2k miles.

    I can sometimes smell the coolant when I get out of my car, but I don't see anything on the ground. Leads me to believe it is dripping on something hot and evaporating.

    Any tips would be appreciated.

    Thanks,
    Kevin

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  3. #2
    B1n2fra's Avatar
    B1n2fra is online now Cadillac Owners Fanatic
    Automobile(s): 2007 1SG Cadillac sts v8 awd
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    I know on the northstar it would more likely be the water pump. You can try that first.

  4. #3
    kschwed is offline Cadillac Owners Fanatic
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    Re: Leaking Coolant Somewhere

    Is that something I can fix myself, being relatively mechanically inclined?

  5. #4
    chazglenn3's Avatar
    chazglenn3 is offline Cadillac Owners Connoisseur
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    Re: Leaking Coolant Somewhere

    Sure. I didn't want to deal with it so I had the dealer change my water pump. It was a $700 repair covered under my extended warranty. An AllData account or the factory service manual will be your friend.

  6. #5
    kschwed is offline Cadillac Owners Fanatic
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    Re: Leaking Coolant Somewhere

    Quote Originally Posted by chazglenn3 View Post
    Sure. I didn't want to deal with it so I had the dealer change my water pump. It was a $700 repair covered under my extended warranty. An AllData account or the factory service manual will be your friend.
    Thanks for the info. Does anyone have the info needed to replace the pump, including the part number? I don't mind paying for an account on alldata, but if someone has the info already, that would be helpful.

  7. #6
    B1n2fra's Avatar
    B1n2fra is online now Cadillac Owners Fanatic
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    Your water pump should be easier since there's more space than in the v8

  8. #7
    JGarten is offline Cadillac Owners Member
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    Re: Leaking Coolant Somewhere

    For me, it was the plastic "T" connector on the radiator overflow hose. Funny thing having a "T" connection on an overflow hose, but there it is. Runs right across the top of the radiator where it can be exposed to some sharp edges if not seated properly (got smashed by the hood?) No puddle on the floor, but the top right corner of the radiator was wet. Three hose clamps and a brass "T" fixed it. Easy Peasy.

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