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  1. #11
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    129

    Default

    I wouldn't stop using Dexcool. Just don't think it is okay to leave it in for 100k. Change it every two or three years / 50,000 miles.
    If you do decide to switch make sure the coolant you choose is 100% compatible. It will say so on the container. If it isn't, you are in for one helluva mess.
    Cause it is almost impossible to get all the coolant out of your engine.
    2012 Silverado 1500 LT 4X4
    2003 Suburban LT 2500 6.0L
    2004 2500HD Crew Cab LT 4x4 6.0L - SOLD

  2. #12
    Sr. Apprentice
    Join Date
    Dec 2011
    Location
    Monterey, CA
    Posts
    33

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    GM's are known for having problems with the intake manifold gaskets. It can affect cars with as few as 24k miles. I had the problem with my Tahoe at 67K miles and first noticed a loss of power as though the engine was running too rich. In reality the coolant was coming into the engine and affecting the combustion.

    I was lucky that very little coolant go into the engine and none into the crankcase in which case my engine would have self-destructed very quickly. I bought a set of top quality after market gaskets by Edelbrock as I was not about to trust ones from GM.

  3. #13
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    129

    Default

    Quote Originally Posted by elkhornsun View Post
    GM's are known for having problems with the intake manifold gaskets. It can affect cars with as few as 24k miles. I had the problem with my Tahoe at 67K miles and first noticed a loss of power as though the engine was running too rich. In reality the coolant was coming into the engine and affecting the combustion.

    I was lucky that very little coolant go into the engine and none into the crankcase in which case my engine would have self-destructed very quickly. I bought a set of top quality after market gaskets by Edelbrock as I was not about to trust ones from GM.

    I believe the problem is actually the coolant (Dexcool) causing the intake gaskets to fail and not the gaskets themselves. I have read many articles in GM Performance magazine where they do rebuilds or upgrades and they always mention reusing the intake gaskets (as long as the ports match).

  4. #14

    Default

    The 4.8 is known for cracks to develop in the heads. My 03 lost enough every 3 months to empty the resovoir and drop the radiator level enough for the low coolant light to appear.

  5. #15

    Default

    I'm with paracutin... I had a similar issue with my 97 2500hd which eventually showed itself when it started leaking more. Ended up being the intake manifold. Good luck.
    2009 Chevy Silverado 2500HDLT 6.0L w/ Towing Package, Dick Cepek GM8 Rims, Dick Cepek FC II 33X11.50R17,RKSport Ram-Air Hood(Functional), Lazer Lite Aluminum Tonneau Cover, Road Armor Stealth Bumper, PIAA Lighting, Diablo Trinity Tuner, Diablew Custom Tune, BullyDog Cold Air Intake, American Racing Headers w/highflow cats, Corsa Performance Sport Exhaust, Custom Striping, Black Bowties front and rear, Fuel Grille Inserts, Recon Headlights, Readylift Shocks, Readylift Upper Contol Arms, 2" Blocks in the Rear..

    Future Plans: HD Tie Rods, Under hood upgrades, Crower Camshaft and possibly electric fans.

  6. #16

    Default

    Whoa whoa whoa, gen 3 motors have dry intakes with cross over tubes. What i would do is make absolutely sure there are no external before you go too deep. Pull the fan shroud and check the rad fully, check the trans fluid cuz that year was known for the internal trans cooler in the rad to leak coolant into the trans. Then pull the cabin filters and check the heater core. Tell us what you find.

  7. #17
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    129

    Default

    Do 04's have cabin filters? My 04 2500HD doesn't.

  8. #18
    Jr. Apprentice
    Join Date
    Sep 2011
    Location
    Campbell River, B.C.
    Posts
    21

    Default

    I believe they stopped putting in cabin filters in '03 (or '02?). I would definatly check the water pump seal area, I have seen slow leaks happen there, and in some cases the coolant evaporates before it can drip due to engine heat. So check all lines for a dried whitish/greenish substance, and as others stated the rad and underlying areas as well.
    Rob - Campbell River, B.C.
    1997 GMC Jimmy SLT
    2007 Chevy Silverado 1500 LS 4x4

  9. #19

    Default

    Our 97 Gen 3 has a dry intake.... but the crossover ports are still there. The intake and gasket are used to plug the ports. Do a search on the internet this is a known problem as Chevy used plastic gaskets initially on the Gen 3 motors.... and are known to leak.

  10. #20

    Default

    Quote Originally Posted by TimTom64b View Post
    Our 97 Gen 3 has a dry intake.... but the crossover ports are still there. The intake and gasket are used to plug the ports. Do a search on the internet this is a known problem as Chevy used plastic gaskets initially on the Gen 3 motors.... and are known to leak.
    97 gen 3? What corvette? All of the new truck motors(4.8,5.3,6.0) have dry intake and there are no coolant ports in the heads to the intake. There are just cross over tubes with o-rings and a coolant tube running to the tb to warm incoming air on cold starts.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


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