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.
Average mileage: 150,576 (98,000–180,000)
Engine affected: 4.3L V6
11 people reported this problem
Viewing 1 - 3 of 3 comments
I have external cooling lake on the right hand side of the engine that start like 400 miles ago very little now it's leaking out a lot more
My 2000 Astro uses a little coolant and I have to re-fill it from time to time. It;'s not leaking on my driveway and it's not showing up in the oil, so it must be burning it up just a teeny bit at a time. No serous problem from it so far, (several years now) so I'll just keep adding some from time to time. It's lot cheaper than a major gasket replacement would be.
Antifreeze in oil