What was the indicated temperature on the dash gauge when the cooling system "boiled over"? Chances are there was an air bubble trapped in the cylinder head when you filled the cooling system, unless you drilled a small vent hole in the new thermostat, or "burped" the system by loosening the upper hose as you filled the radiator. Unless you could confirm a coolant temp of 200+ degrees in some way, it probably wasn't actually boiling. Expanding air can push coolant out of the overflow, especially if you have a "zero-pressure" system, or maybe a 4 pound radiator cap.
Jerry
No drilled hole in the thermostat didn’t think to look at the temp gauge will be looking at the radiator cap to see if it has lbs numbers when I drained the radiator very little rusty water came out.is a small hole drilled into the thermostat since I have it out?
