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  1. #1

    Default 1999 5.7 Intake Mani Coolant Leak

    Hey!

    I've got a 1999 CK Truck: bought it brand new. Three doors, 4WD, 5.7 / 1500, Air Con, Power everything, O/D auto trans, etc. Just went over 100,000 miles because I didn't drive it regularly.

    Lately, I noticed the coolant was down. Added some. It went down again and then overheated. Checking it out, I have a coolant leak at the forward right corner of the intake manifold. Don't even have to start the engine: just put a garden hose into the radiator and water starts flowing out at the busted mani gasket like a fountain.

    Guess I'm going to have to pull the manifold and replace the gaskets. I'm an old Chevy guy and can do it, but most of my experience is with older vehicles so I thought I'd ask around.

    I've learned this is a fairly common problem: manifold bolts untorque after a while. So i figure there's probably some of you out there who have gone through this already.

    Any tips or info you'd care to share would be greatly appreciated.

    Thanks,

    Pat

  2. #2
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    murdog94's Avatar
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    Default

    Actually this is a very straight forward repair.. Just unplug, and unbolt. Clean it all up, and put in the new gaskets.. Kinda surprised that it let that far loose though, most people have a problem with the coolant getting into the motor. which is worse if you ask me.
    Good luck. There might be some guys on here who have a few pointers that i might not have used but as i said, if you have ever worked on a 350 before you are looking at pretty much the same thing.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

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    Maybe take some pics as you are removing the components bolted to the manifold. Spray the EGR tube at the front of the manifold with some good quality penetrant. PB Blaster or Deep Creep.
    When you hear hoofbeats, look for horses not zebras.

  4. #4
    Master Mechanic Dr_Zero's Avatar
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    Sunny Florida
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    Default

    Quote Originally Posted by vulcania View Post
    Hey!

    I've got a 1999 CK Truck: bought it brand new. Three doors, 4WD, 5.7 / 1500, Air Con, Power everything, O/D auto trans, etc. Just went over 100,000 miles because I didn't drive it regularly.

    Lately, I noticed the coolant was down. Added some. It went down again and then overheated. Checking it out, I have a coolant leak at the forward right corner of the intake manifold. Don't even have to start the engine: just put a garden hose into the radiator and water starts flowing out at the busted mani gasket like a fountain.

    Guess I'm going to have to pull the manifold and replace the gaskets. I'm an old Chevy guy and can do it, but most of my experience is with older vehicles so I thought I'd ask around.

    I've learned this is a fairly common problem: manifold bolts untorque after a while. So i figure there's probably some of you out there who have gone through this already.

    Any tips or info you'd care to share would be greatly appreciated.

    Thanks,

    Pat
    Here is my .02 http://www.gmtruckclub.com/forum/showthread.php?t=22498

    I went through all the gasket options I could find and posted it there
    My trucks!

    1996 GMC Suburban SLT
    1997 GMC Yukon SLT

  5. #5

    Default

    Quote Originally Posted by Dr_Zero View Post
    Here is my .02 http://www.gmtruckclub.com/forum/showthread.php?t=22498

    I went through all the gasket options I could find and posted it there
    Thanks guys. I'm on it.

    Pat

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