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.
Intake Manifold Gasket May Leak Coolant or Engine Oil on Chevrolet Express 3500
Average mileage: 80,600 (44,000–120,000)
Engines affected: 5.7L V8, 7.4L V8, Gasoline
12 people reported this problem
1997 Chevrolet Express 3500 - 5.7L V8 120,000 mi, Visitor
Leaking anti-freeze with smell, but no visible sign of leakage until gasket blew. Had to replace at 120,000 miles.
2013 Chevrolet Express 3500 44,000 mi, Visitor
I have a 2013 chevy express 3500 6.0 im losing coolant but no signs of a leak anywhere.
2000 Chevrolet Express 3500 - 7.4L V8 70,000 mi, Visitor
twice now. first time payed for repair but the valley gasket slipped out at one corner and seems that the lower was over torqued... I am doing my self this time. I am not sure if I should use any "RTV" or sealant whatever...
2002 Chevrolet Express 3500 - 5.7L V8 85,000 mi, Visitor
smell engine coolant and notice its coming from intake manifold