I've developed a not so small coolant leak on my 2000 silverado. It's not the water pump, I've checked that thoroughly. It looks likes it's coming from the front of the pass side head gasket. The really odd part of this leak, and what makes it so hard to find is that it only happens at night after everything is cooled off. It doesn't leak when the motor is running, or when it's turned off, or when it's sat for a few days. It's only after it gets warm then shut down and cooled off (like not even warm to the touch) Then it burps a trickle of coolant out onto the floor. I've never acually seen it leak out but i've followed the moist path it takes. So what happens inside the coolant passage to create enough pressure to kind of burp out coolant and not leak when the motor is running? Any TSB's on head gaskets for the 5.3 L vortec? It's got less than 50K miles, and no as luck would have it no extended warranty. Thanks. BC
- posted
20 years ago