GOOD NEWS!!!! bought a new cap today.....($ 25.00)....drained out 3/4ths of a gallon of anti-freeze, added 3/4ths of a gallon of water- fired it up running wot....with mower running for 30 minutes....top of the radiator was still cold!!! this morning i took the old cap to work....and we tested it on a rac car cap checker....it leaked the instant we pumped it. now....the cap is stamped 0.9.....is this psi? anyway....im hoping i have the problem fixed....even though the dealer robbed me for 25 bucks for a freaking cap!!!!:mur: