Car Problem Reports

Chevrolet G Series Van (G20) Intake Manifold Gaskets May Leak Coolant or Engine Oil

Chevrolet G Series Van (G20) Problem
13 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998

Engines Affected: 5.7L V8, Gasoline

Average Mileage: 123,486 mi (107,000 mi - 150,459 mi)


The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.

  • Visitor, , 5.7L V8, 107,000 mi

    Saw coolant leaking from front of manifold.
    removed manifold, found more leaks between head gaskets into oil.
    replaced with new gaskets, problem solved.

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  • I have gotten a leak from the radiator and the intake gasket (outside) Radiator repaired and hoses . Did not bother with the small leak of the intake manifold

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  • Visitor, , 5.7L V8, 113,000 mi

    breather grommet went first. easy fix.then intake gasket along with manifold gaskets...though manifold may have crack in it...wont know until it is pulled. hear these vans have manifold cracking issues (darnit. Already replaced transmission at 112k. Also, rear diff seals shot and have to replaced. Happy Trails.

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  • Visitor, , 5.7L V8, 150,459 mi

    really its 1988 but yeah im thinkin about do all gaskets since coolant n oil is mixed SMH

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