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  1. #1

    Default 94 K1500 with small coolant leak

    My 94 K1500 5.7L is dripping a little coolant and I can't find out where. None of the hoses are leaking and it seems like it might be from the back of the engine but I can't see back there to tell. I did do a pressure test at 15psi for ten minutes and it didn't drop a bit. Is that long enough for a normal pressure test? Also, anybody got a clue where the leak might be coming from and how to tell. And anybody got an opinion on those "stop leak" solutions?

  2. #2


    If it is dripping off of the back of the engine it could be the back of in intake manifold that is leaking.
    93 K1500 5spd 5.7 350
    Holley 670 cfm
    K&N Cold Air
    Hypertech prom
    Custom Exhaust
    Speed pro forged flat tops
    Msd Ignition
    Edelbrock cam

  3. #3


    I don't have any advice to lend about the leak. But, stay away from the stop leak stuff. Can/will cause more issues down the road.

    2011 GMC Sierra SLE - 5.3 - 4X4 - Z71 - King Shock Level Kit - Body Color GMC grill emblem - 2 Tone Engine Cover, Rad Cover and Battery Box - Volant CAI - Tru Cool 40K tranny cooler - Sylvania ZXE bulbs Hi/Low -TriFold Hard Tonneau Cover- CoverCraft Seat Covers - Diablo inTune - GoRecon LED under rail lights - GoRecon LED White Lightning Tailgate Light Bar - Windows tinted to 45%- Kenwood DNX6990 - JL Audio C5-650 &650X- JL Audio Amp- Interco Truxus M/T 33x12.50x18

  4. #4
    Jr. Apprentice
    Join Date
    Apr 2012
    Bancroft IA


    I just had this issue myself. It ended up being the hose to the overflow tank was leaking at the radiator while under pressure.

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