Repairing a blown head gasket can be expensive.
But let's try to figure out what is going on.
If the head gasket is really bad, (as compared to a small leak) the pressures in the combustion chamber will immediately start to over pressurize the coolant system.
If it's happening because it's over heating, (say because the thermostat isn't opening) it would take a few minutes
and you can't completely trust your temp gauge or warning light when it comes to a situation like this.
If there is air in the system (or steam ) the temp sensor isn't effected much because air and steam don't transfer heat as well as water does.
Friday, January 2nd, 2009 AT 10:21 PM