Originally Posted by JimBlake
The radiator cap is what controls pressure in the cooling system. Isn't anyone gonna suggest trying a new cap?? If your mechanic actually tested the cap (I it's OK), maybe he can explain a little better what he means by the pressure being too high.
There's 2 or 3 places on the radiator neck where the cap seals against. Make sure they're clean & don't have gouges...
But if water is coming out of the exhaust, I think there's a headgasket leak.
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