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 GMC Sonoma
Average mileage: 152,482 (75,000–287,000)
Engines affected: 2.2L 4 Cylinder, 2.5L 4 Cylinder, 2.8L V6, 4.3L V6
15 people reported this problem
1995 GMC Sonoma - 4.3L V6 82,376 mi, Visitor
intake manifold leaking coolant front drivers side
1996 GMC Sonoma - 4.3L V6 168,000 mi, Visitor
Intake manifold gasket failure, coolant leak out of motor (not into motor) on passenger front
1998 GMC Sonoma - 4.3L V6
Manifold gasket leak, caused by dexcool antifreeze in 2004 at 70,000 miles, Flush system changed to green anitfreeze. have not had problem since. Now 2014 125,000 mile. Other issues. strange noise from drive-train found drive shaft to be the issue, CV joints changed out to "U" joints no more problem. Fuel pumps on fourth one, 3 of which were on warranty. Motor mounts at 81,000 again at 101,000. Third door handle 3 GM factory replacements went on line found a aluminum after market type which fixed the problem.also same issue with reclining seat handle.Found at the same on line site. Replace control arm bushings at 100,000. On going problem with window regulators both sides.in process of fixing now.
2000 GMC Sonoma - 4.3L V6
intake manafold leake replaced once allready 2 years ago now leacking agian crack in manafold
2002 GMC Sonoma - 4.3L V6 180,000 mi, Visitor
I have coolant leaking from my intake manifold and since i don't know how to fix it, i continually put coolant in the truck.
1995 GMC Sonoma - 2.5L 4 Cylinder
Internal leak coolant mixes with oil, replace intake manifold gasket.
1996 GMC Sonoma - 2.2L 4 Cylinder 287,000 mi, Visitor
antifreeze leaking from head gasget
2000 GMC Sonoma - 4.3L V6 125,000 mi, Visitor
Leaking intake gasket