I have read tons of posts about coolant in cylinders but have not found a satisfactory answer to my problem. After the car was running perfectly the next morning the engine was locked up due to water in one cylinder. I took the upper and lower intake off and didn't find any coolant in the intake. The LIM gaskets were the old plastic ones and 3 of the 4 coolant passage holes were cracked. There does appear to be some oil in the coolant but no coolant in the oil.
I have read many posts claiming that the LIM gaskets leaking can cause coolant in a cylinder. I don't see how. The coolant ports in the gaskets have holes next to them leading into the crankcase not into the intake port. If it'* possible can someone explain this to me? I'm thinking head gasket but the car has never overheated as far as I know.
My UIM has been replaced at some point in the past. It has an '04 date code and the car is an '00.
Thanks but that doesn't answer my question. From your answer the only way coolant could get in the cylinder is when the car is running. I can't see how it would get in there either unless the intake filled up which it can't because it would run out the throttle body.
I'm still looking for an answer to how? The heads have slots in them between the coolant passage and the intake port that leads to the valley. I can't see how the coolant could jump that hole and get into the intake port. It seems to me that it would just fill the crankcase instead.
If it was a headgasket, you would be taking compression to the cooling system, and that is usually pretty apparent when it happens. The only other thing I can think of would be a cracked head. Otherwise, the UIM/LIM is the most likely offender.