Chevrolet Suburban 1500
Report: Intake Manifold Gaskets May Leak Coolant or Engine Oil
Chevrolet Suburban 1500 Problem
Engines Affected: 5.7L V8, Gasoline
Average Mileage: 130,282 mi (47,000 mi - 198,000 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, 1994 Chevrolet Suburban 1500, 106,000 mi
When I checked the oil (only 200 miles after oil change) I found an over full condition and the oil was milky colored. I then checked the radiator and the coolant was low. I pressure tested the radiator and it held pressure. I then changed the oil and filter and ran the engine to operating temp, with the engiene running and radiator cap removed I looked for bubbling in the radiator that would be common with a blown head gasket, there were no bubbles. I replaced the radiator cap and let the vehicle sit over night then checked the oil, it was over full and milky colored and coolant was down again. I concluded it was most likely an intake gasket by the amount of coolant in the oil. If it were a head gasket most of the coolant would likely burn off while the engine was running. I pulled the intake manifold and looked for the leak path in the gasket, also checking for a crack in the lifter galley of the engine block. The block looked good so replaced the intake gasket and all is well so far, clean oil and full radiator.
Visitor, 1995 Chevrolet Suburban 1500, 5.7L V8, 47,000 mi
Coolant observed pooling on the intake manifold where it meets the head and in front portion of engine block/intake manifold weeping of coolant seeping there too. A temporary band-aid fix is what I used until the intake gasket was replaced; the band-aid was accomplished by adding Bar's-type stop leak for radiators. It is Irritating that GM would not make this right via recall. Mechanic charge was $500 to replace the intake manifold gasket.
Visitor, 1999 Chevrolet Suburban 1500, 5.7L V8, 140,000 mi
uses extra coolant. still looking for a cure.
Visitor, 1999 Chevrolet Suburban 1500, 5.7L V8, 150,000 mi
My suburban started leaking coolant a few years ago. A mechanic said it was the intake. I kept driving it until the coolant started mixing with the oil in the engine and the vehicle started running hot. I have a mechanic working on it now who says he may be able to repair the intake valve without replacing it.
leaking water finally researched and realized that it is a frequent issue.
Visitor, 1998 Chevrolet Suburban 1500, 5.7L V8, 150,000 mi
water in the oil
Could smell hot coolant and noticed small leak when checking oil level
Visitor, 1999 Chevrolet Suburban 1500, 5.7L V8, 116,000 mi
EXCESSIVE COOLANT CONSUMPTION AND LEAAKING FROM TOP FRONT OF ENGINE BLOCK