Ok, tonight i was going thru a parking lot with my heater up to high (my own dumb fault) and broke off the stem from my heater control valve and its stuck in the hose. I found one but there is two kinds. One is a Vaccum NON-bypass open heater valve and the other is a Valve Heater Water bypass. Its a 91 V6 3.1 L auto Pontiac firebird. HURRY! i need to know which one i need so i can order and new one and get the car home before my dad knows!