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Thread: 3100 coolant leaking onto starter

  1. #1

    3100 coolant leaking onto starter

    Looked at somebody's 3100 today and appears to have coolant leaking onto the starter vacinity, but it might be from the bleader valve. The thermostat housing doesn't appear to be leaking and doesn't look like anything is leaking from any nearby lines. Wondered what other possibilities exist. Oil is clean. Car is a 96 with 190K on the clock.
    <br />92 coupe and 93 vert LQ1&#039;s<br /><br />I own 2 so I have one to drive when the other breaks

  2. #2


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    Re: 3100 coolant leaking onto starter

    Upper Radiator hose, or quite random but a crack in the thermostat inlet pipe... are you running dexcool?
    1999 Lumina Ls 3100<br />-GMPP Front STB<br />-MMI WAI<br /><br /><br /><br />Obama For President!!

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    cutty's Avatar

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    Re: 3100 coolant leaking onto starter

    could be a water pump also
    -Jim
    1995 Oldsmobile Cutlass Supreme SL | 3.1L(3100 SFI) 191ci 60º V6; 4T60E

    2008 Dodge Grand Caravan SE | 3.3L V6


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    Re: 3100 coolant leaking onto starter

    Quote Originally Posted by cutty
    could be a water pump also
    water pump is on other side of the motor, if it was leaking it would end up on the vally between the ac compressor or on the ac compressor
    1999 Lumina Ls 3100<br />-GMPP Front STB<br />-MMI WAI<br /><br /><br /><br />Obama For President!!

  5. #5

    Re: 3100 coolant leaking onto starter

    Bad freeze plug?
    Jay
    1988 GMC Sierra SportSide "Indy Hauler" clone|350 TPI (project in pieces)
    1991 Chevrolet S10 Blazer Sport 4x4|4.3 TBI (Winter driver)
    1995 Oldsmobile Silhouette|3.8 TPI (Summer driver)

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    Re: 3100 coolant leaking onto starter

    Check the coolant hoses/pipes under the TB. It could drip onto the trans and down onto the starter. Best bet is to put a pressure tester on it. Autozone rents them.
    1991 Cutlass Supreme 3.1L 109k<br />

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    Re: 3100 coolant leaking onto starter

    check intake gaskets
    4 + 4 + 2 = 10 for Oldsmobile 1996 Olds Cutlass Supreme SL IV 3100
    RIP Oldsmobile 1897-2004

  8. #8

    Re: 3100 coolant leaking onto starter

    Quote Originally Posted by cutlassdude96
    check intake gaskets
    does this commonly cause external leakage?
    <br />92 coupe and 93 vert LQ1&#039;s<br /><br />I own 2 so I have one to drive when the other breaks

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    Re: 3100 coolant leaking onto starter

    Quote Originally Posted by joey b
    Quote Originally Posted by cutlassdude96
    check intake gaskets
    does this commonly cause external leakage?
    im not sure, but I have had that happen to me once and it was either the gaskets or an o-ring on the heather line going the heather core
    4 + 4 + 2 = 10 for Oldsmobile 1996 Olds Cutlass Supreme SL IV 3100
    RIP Oldsmobile 1897-2004

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    Re: 3100 coolant leaking onto starter

    Quote Originally Posted by Chancho
    Quote Originally Posted by cutty
    could be a water pump also
    water pump is on other side of the motor, if it was leaking it would end up on the vally between the ac compressor or on the ac compressor
    That is correct. Now if you were saying that there was coolant on the acc. belt, then it'd definitely be the water pump.

    Quote Originally Posted by cutlassdude96
    Quote Originally Posted by joey b
    Quote Originally Posted by cutlassdude96
    check intake gaskets
    does this commonly cause external leakage?
    im not sure, but I have had that happen to me once and it was either the gaskets or an o-ring on the heather line going the heather core
    That is incredibly unlikely to be the cause of an external leak unless the UIM is not torqued to spec. Check the upper rad hose and go from there.
    - Mike K.
    '94 Oldsmobile Cutlass Supreme SL 4AT - For Sale
    '00 Subaru Outback AWD 5MT - Soccer Mom Pimpin'
    '04 Mazda Mazda6s 5AT - Wife's

  11. #11

    Re: 3100 coolant leaking onto starter

    no... it can leak to the outside. usually they leak to the inside though. maybe 1 in 20 leaks out and not in.


    BUILDER AND DESTROYER OF FINE(?) AMERICAN CARS.

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    Re: 3100 coolant leaking onto starter

    Head gasket could come out the front also...
    1991 Cutlass Supreme 3.1L 109k<br />

  13. #13

    Re: 3100 coolant leaking onto starter

    i was thinking freeze plug too

  14. #14


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    Re: 3100 coolant leaking onto starter

    I still think its the upper rad hose
    1999 Lumina Ls 3100<br />-GMPP Front STB<br />-MMI WAI<br /><br /><br /><br />Obama For President!!

  15. #15

    Re: 3100 coolant leaking onto starter

    I think it's the intake gasket, only because when mine went, the coolant dripped from near the oil pump drive, ran down the block and soaked the starter.
    Yeah, it's still on the road. 5/21/12 210,800+



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