2001 GMC Jimmy Q&A
2001 GMC Jimmy Question: Oil in the radiator
My sons 2001 GMC Jimmy was overheating when he got home the other day. I let it cool down and then I checked the coolant level in the radiator and I noticed engine oil in the radiator. I checked the oil dipstick and there was none showing on it. I thought blown headgasket or worst case cracked head or block. How can you tell if it's a blown headgasket rather than a cracked head or a cracked block? - lalauncher
There is know way that I know of to tell the difference between a blown head gasket or cracked engine block or cylinder head without pulling the head(s) for inspection. There should be no pressurized oil flowing between the engine block or in the cylinder head of this type of engine. The oil is pumped to the valve train via the push rods. Does your Jimmy have an in-radiator engine oil cooler? - Jim Taddei
With what or by what means do I plug the inlet and return holes in the radiator?
the coolant was thick a dark brown in coler
would high coolant temp and low oil pressure be indicative of an oil cooler failure or head gasket? 4.3 litre eng runs strong, only blows oil at startup and doesn't pysically overheat, even though ...
Took off again to see if was seated properly and it was.There is no cracks on intake or engine block,used proper gasket and sealent. What could it be?
Termed on stick. Red oil started running out above middle to right side above right wheel. Pouring. What is causing this