my mechanic had determined the crack in the head on cylinder #3 and #4 caused the initial leaking, and Improper mixture of coolant/water. The water ratio to coolant he said was absurd. The head was rusted/clogged and tore it apart. So he had put on a Used 22RE Head and said it was O.K. As for the over shoot problem of the thermostat - I thought True OEM stats were Only notoroious for doing that Once a day (usually first start up).

Everything smells good still and coolants high and heat output it Still phenominal. Whats the trick again to burp a system, park it on an incline and heater on High while letting it idle and radiator cap off?

I've never done this before so this will be new to me lol.

And you say all of your toyotas make a rushing/squirting sound in the heater core area? hhmmm...so odd ya know.