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  1. #1

    Default Leaking Antifreeze

    Leaking antifreeze from it looks like oil pan. already replaced water pump, hose and hoses. I also replaced the thermostat. Can anyone help? Anybody have any ideas?

  2. #2
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    High Deserts of SoCal


    Borrow or buy yourself a coolant system pressure tester. You should be able to isolate the leak. Search the forums for info. You could have a leak at back of the engine. Heater hose, or intake manifold.
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  3. #3


    You might get a more specific answer if you tell us what year/engine you are working on.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
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  4. #4
    Jr. Apprentice reaper's Avatar
    Join Date
    Nov 2009
    Western Nebraska (almost Colorado)


    you could also have a freeze plug or block heater leaking..What part of pan are you looking at?
    That which does not kill you...will only make you stronger!!!

  5. #5


    You might be seeing the coolant running off oil pan but all bet its running down from something overlooked. If you can borrow a pres. tester that would your best bet

    99 tahoe 2 dr. 4x4 7.4 4L80-e NP246, SAS, dana 60 hp, sterling 10.5 rear, gibson headers, and alot of tricks of the trade !!!!!!IF YOU'RE NOT CHEATING YOUR NOT TRYING!!!!!!!!

  6. #6


    On a '96 w/350R engine I had there was a coolant leak at the back of the intake manifold. It ran down the back side of the engine. I don't know if it is the same as yours, but that is where mine was.

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  7. #7

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    I have the same story as retired2001.

    My 1998 was leaking from the intake mainfold dripping backward so it looked like it was coming from the oil pan.

    Intake manifold gasket leaks are EXTREMELY COMMON in the GM small blocks and some say on all GMs with the Dexcool.

    It is a 6-8 hours DIY job, or close to $800 to have a shop do it.The gasket kit is about $70 online.

    Make sure you use the latest "fancy brand" gasket kit.Search here and you'll find the right number. It is a really common gasket company-the name just escapes me now.I think there is a 58000 in the number.

    1998 suburban-
    1/2 ton

    199500 miles

  8. #8

    Default Leaking Antifreeze

    Take it back immediatly. Unless you hate your car, in wich case, let it keep leaking and sue jiffy lube for a new engine.

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