Car Problem Reports

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

 
Chevrolet Express 1500 Problem
23 Reports
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Model Years Affected: 1996, 1997, 1998, 1999, 2000, 2001, 2002

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

Average Mileage: 102,333 mi (50,000 mi - 145,000 mi)

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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, 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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  • Visitor, , 5.7L V8, 120,000 mi

    Gasket leak had come back after replacing the spider assembly. Threw in the coolant tabs again and everything seemed fine but then went for a long road trip (+1000 miles) and, fortunately, when I got home it came back with a vengeance! It is a heck of a job... should have done it when I did the spider assembly.

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  • Visitor, , 5.7L V8, 117,000 mi

    was repaired at shop

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  • Visitor, , 5.7L V8, 120,000 mi

    Haven't fixed it yet, but its leaking antifreeze pretty bad.

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  • Blown intake gasket, fixed it myself, now it has two error codes and will not pass emissions, one is a random multiple misfire, the other is a cam code

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