Ok BJ I must disagree a little here. Now I do agree while running the pressure in the cylinder is absolutely higher than coolant pressure, but when the engine is not running the pressure in the cooling system is higher than the pressure in the cylinder. I had 79 Honda Accord that had a leaking head gasket in cyl #2 and as long as I drove the car every day it would keep running, but if I let it sit for more than about 3 days enough coolant would leak into the cylinder that the engine would not turn over and I would have to pull the plug and crank it over to let the water out before it would start. The really quick tell tail if there is a coolant head gasket leak, when he starts the jeep does it puff ôwhite smokeö (steam) out the tail pipe for the first minute or so, what does the coolant in the radiator look like, and what does the oil look like. Eventually it will get to the point where there is oil in the water and water in the oil if the head gasket is leaking.

Now all that being said, to me it does not really sound like this guy has any of these problems. It sounds to me like his jeep needs a tune up.

Sean