If the thermostat is sticking closed, the engine will overheat. You would know that by the warning light or gauge on the dash.
If you remove the radiator cap when the engine is still cold, then water bubbles out as soon as you start the engine, you know it isn't hot yet, so that just leaves the head gasket or cracked head as suspects.
Wednesday, April 13th, 2011 AT 12:14 AM