Question about 1999 GMC Suburban

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Coolant problem (leaking somewhere)

I am leaking coolant but dont know where maybe intake gasket need help

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  • Anonymous Feb 20, 2009

    We had a 1997 Suburban (157,000 miles) do the same thing. I noticed a slow leak. We had to put water/antifreeze in it once every two weeks.



    We took it into today and they said it first it was the water pump. Then after further review, they found that the intake gasket blew a hole in the intake manifold.



    Cost of repair was $467. They said that the Dexcool fluid that is recommended for GMC vehicles, eats away at the gasket slowly. I didn't know this.



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If this is a 4.8, 5.3 or 6.0 liter they are notorious for water pumps.The 4.3, 5.0, or 5.7 liter are known for intake gaskets. Both leak slowly at first and evaprate from engine heat quickly.

Posted on Jan 20, 2009

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