[Jack21]

Ditto. Puke tank is for fluid overflow and is not pressurized. Got a plastic coolant overflow kit from local Trak/Pep Boys and a Stant 7 # cap. As engine gets hot, coolant flows out of the pressure cap on radiator into the overflow tank. As engine cools, vacuum is created, and coolant goes from tank, back into the radiator. Cooling system "breathes" and keeps air out of the cooling system.