Car Problem Reports

Chevrolet Express 1500 Intake Manifold Gaskets May Leak Coolant or Engine Oil

Chevrolet Express 1500 Problem
29 Reports
Me Too

Model Years Affected: 1996, 1997, 1998, 1999, 2000, 2001, 2002

Engines Affected: 5.0L V8, 5.7L V8, Gasoline

Average Mileage: 99,062 mi (50,000 mi - 145,000 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, 75,000 mi

    Upper intake manifold gasket leaks. I had a cracked radiator which I replaced but the leak moved to the back of the engine block. Found out that the gaskets are made of plastic and possible corrode due to the antifreeze chemicals. It is a huge job to replace. My mechanic suggested trying the radiator sealing tabs first to see if it would fix the problem. It did. I talked to another buddy of mine who is a service technician and he believed that even brand new, they put those tabs in... faulty design!!!

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  • Visitor, , 5.0L V8, 68,000 mi

    Noticed a smell of Antifreeze and thought the lower radiator hose was bad. Took it into the repair shop and after some searching they found the Gasket to the INtake Manifold was leaking. With this many reports, there should be a recall.

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  • Visitor, , 93,000 mi

    Mechanic noticed oil and antifreeze leakage. Replaced lower intake gasket.

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  • Visitor, , 5.7L V8, 50,000 mi

    Had a substantial antifreeze leak (about a quart on the floor) attributed to a ruptured intake manifold gasket. Mechanic said that these failures were not uncommon but that they usually occurred around 100K miles. Installed a steel gasket with an insert. No further problems since 2005.

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  • Visitor, , 5.7L V8, 115,000 mi

    Intake gasket failure leaked coolant into oil & burned up bearings. Replaced with salvage yard engine which ALSO failed gaskets and burned up bearings. ENGINE NUMBER THREE has new intake gasket and new crankshaft & bearings!

    What genetically defective idiot at GM decided that plastic intakes could radiate heat properly away from the gasket surface?! The intake gaskets simply burn up after ~~100k miles.

    Next van = Sprinter!

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  • Same problem recall GM

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  • Visitor, , 5.0L V8, 87,000 mi

    Leaking very slowly, thought it was a leaking water pump but turned out to be intake manifold gasket, was quoted around $1000 to repair with 7 hr labor. Not sure if I am going to do it yet.

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  • Visitor, , 5.7L V8, 80,000 mi

    manifold gaskets leaking coolant.

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  • Visitor, , 5.7L V8, 120,000 mi

    Loosing antifreeze, engine overheating. Poured gasket sealant in radiator to solve the problem. I don't think in really worked well

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  • Visitor, , 5.7L V8, 145,000 mi

    Oil pressure dropped and discovered coolant was in oil. Not sure if damage was caused to the engine, so repairs have not been done.

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