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Thread: coolant usage

  1. #1

    Default coolant usage

    01 5.3l is using coolant but no visible sign of leak . what could this be?

  2. #2
    Jr. Mechanic TMRuiz's Avatar
    Join Date
    Dec 2008
    Gonzales, Louisiana


    You could have a blown head gasket, and the coolant is being blown out the exhaust. Did you check your oil to see if it has a milky look to it? If it does you have found where your coolant is going.
    [/SIGPIC]07 Silverado LS factory 20's, spray in bedliner, in-bed cargo managment system, matching tint on front windows, K&N CAI, and Hypertech Max Engery Tuner and yet even more mods to come.

  3. #3

    Default coolant usage

    oil looks fine

  4. #4

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    i would say more likely the intake gasket, regardless which gasket it is, replace them ALL when you find the culprit. No point in doing one then having to do it again
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  5. #5
    Jr. Mechanic
    Join Date
    Dec 2009
    Deep River Ontario


    you would be able to smell coolant in the exhaust, just place your hand by the tail pipe for a few seconds with the engine running and then smell your hand, you'll know if it doesn't smell right, also might even be your rad cap, not holding pressure and letting the coolant boil over.
    06 Z71 Silverado Military Style!!!

    Red Seal Certified Automotive Service Technician

  6. #6


    I'm running through the same thing right now. My '99 5.7 has been slowly loosing fluid with none of the normal signs of leaking gaskets. I think I have it close now...we moved and I now park on clean, white concrete. Now I am finding small, intermittent puddles. I have yet to find the actual leak; it's running along the chassis from somewhere other than where it drips from. It's slow enough I just can not find it....yet.
    1999 Suburban C1500 LS 5.7 K&N filter, VentVisors, debadged aka "LAAT/i...Larty"
    1994 C2500 454. Ex-Forest Service beastie. aka "Redneck"
    2006 Saturn Ion...the Wife's car.
    Empty spot that needs a Jeep...

  7. #7


    My 99 Suburban developed a leak in intake gasket above #1 cylinder. The coolant level kept slowly getting low and no sign of a leak. It was dribbling down the front of the bl;ock and the heat of the engine was evaporating most of it. If you pressurize the coolant system with a tester ( available at most auto parts suppliers, buy or rent) the leak will show up

  8. #8
    Sr. Apprentice itsabowtime2's Avatar
    Join Date
    Dec 2009
    TN, via MI, OH and NY


    Just had the same situation with my 2002 5.3L. It was a weep hole on the water pump causing mine. It was impossible to see w/o lifting the truck. New H20 pump is about $130.00. I did my belts as well.
    2003 Chevy Tahoe Z71 4x4
    Other vehicles:
    2000 F250 Super Duty Crew Cab 4x4
    2005 Dodge Grand Caravan
    3055 Bayliner Ciera (2x SBC)
    Sea Doo GTX Limited
    Sea Doo XP (currently rebuilding the engine)

    Life is short. Boats and trucks are cool.

  9. #9


    My old 5.7 was always down a little on water when i checked it finally found it after i pulled the motor the manifold was weeping right next to the #2 intake runner down into valley it built up a little oil slime slide right were it ran off the head and ran down valley oil was alway clean or black never saw any signs

    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!!!!!!!!

  10. #10
    Jr. Apprentice
    Join Date
    Dec 2009
    Elgin, Illinois


    My 2002 5.3L leak was also a weep at the water pump; very hard to locate. New water pump, no leak, no harm done. Glad it wasn't a head gasket.

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