Chevrolet G Series Van (G20) Problems

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

Problem Description and Possible Solution

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.

(22 people reported this problem)

Chevrolet G Series Van (G20) Vehicles With This Problem

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Average mileage: 134,075 (107,000–178,643)
Engines affected: 5.0L V8, 5.7L V8, Gasoline
9 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998
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Viewing 1-8 of 8 comments
Noticed moisture on the top of the block when doing a tune up and seepage from the water pump. The water pump itself has been giving off a bit of extra noise then I'd like to deal with and with winter just around the corner, I don't want to get caught out in the rain dealing with any of it. This is typical of these motors. So I Replaced both intake gaskets, heater hoses (they were shot) and water pump. No more noise or seepage problems. A good Saturday afternoon's work.
Water started leaking over Transmission Bell Housing. Traced back the leak to the front Passenger side Intake Manifold Gasket,It is the very front of the Manifold Water Port where Temperature Probe Mounts area.
replaced water pump and thermostat notices coolant leaking for the under the middle of van underneath engine when i turned off van . also the temp teeter totters between hot and cold
Saw coolant leaking from front of manifold.
removed manifold, found more leaks between head gaskets into oil.
replaced with new gaskets, problem solved.
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
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.