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. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
Car Problem Reports
Chevrolet Venture Intake Manifold Gaskets May Leak Coolant or Engine Oil
Chevrolet Venture Problem
Engine Affected: 3.4L V6
Average Mileage: 109,109 mi (40,000 mi - 194,000 mi)
Visitor, 2002 Chevrolet Venture, 3.4L V6, 51,000 mi
I have had two Chevy Ventures that developed this issue - noticed a coolant leak. The first one, 1999 Venture was still under warranty at 18,500 miles and the dealership fixed it by replacing the intake manifold gasket. My 2002 Chevy Venture developed a coolant leak at 45,000 miles and it cost me about $800 to have it fixed. Found out there was a class action lawsuit against GM's Dexcool coolant causing certain parts, such as the intake manifold to fail - was able to recoup about $650 with a bit of patience and sending in some documentation.
Visitor, 2002 Chevrolet Venture, 3.4L V6
when changing oil noticed white film in engine from coolant leaking into engine ,used stop leak and now it leaks outside of engine.
Visitor, 2000 Chevrolet Venture, 3.4L V6, 137,000 mi
Intake manifold gasket needed to be replaced. I was leaking coolant and not quite, but almost overheating. I had a friend do the repairs on the cheap but it was still fairly expensive.
Temp. gage started acting erratic(would move back and forth between normal and hot), followed by anti-freeze smell and loss of heater efficiency. This was due to lower intake gasket failure. Had lower intake gasket replaced, along with heads milled (warped due to overheating)at a total cost of 1600 dollars (off-duty mechanic price!! Shop est. close to 2000!)
Visitor, 2000 Chevrolet Venture, 3.4L V6, 115,000 mi
I had this problem when the car was about four; it was fixed under the original warranty. Now at 14 years, 115000 miles, it started again.
Visitor, 2002 Chevrolet Venture, 3.4L V6, 140,000 mi
My 2002 chevy venture was leaking antifreeze and or water?? Ran hot put in a stop leak now oil is leaking and a milky substance is on my oil cap and water cap.
Visitor, 2003 Chevrolet Venture, 3.4L V6, 91,000 mi
intake manifold gasket leaking coolant .diagnosis put dye in radiator ran truck for a few days checked for dye with black light could see dye around intake manifold. have not fixed yet needs new intake manifold gaskets upper and lower going to shop soon
Visitor, 2000 Chevrolet Venture, 3.4L V6, 110,200 mi
internal coolant leak caused overheating and engine damage
Car started leaking coolant. GM dealership replaced intake manifold gasket. About $750 repair. There was a class action lawsuit against GM's Dexcool and I was able to get about 75% of my money back a couple of years later.
Visitor, 2000 Chevrolet Venture, 3.4L V6, 150,000 mi
Coolant leak, but no puddles under car. Oil dip stick shows coolant. Replaced intake manifold gasket.