SOHC engine, check the thermostat housing. The thing is made out of plastic and the upper/lower tend to warp when they overheat. The rubber gasket at the base could have also failed. If it is the thermostate housing, replace the thermostat as well. My O2 cents. For the guy w/ the OHV engine, could be a cracked head or could be lower intake gasket that's blown.
Last edited by JDO808; 04-04-2010 at 11:06 AM.