Thread: Engine Coolant Temp Fluctuating

when bleeding the air out with the screw, are you supposed to leave the radiator cap off so the system doesn't gain pressure, or are you supposed to leave it on to help push that air out?

leave cap off, start car till its at operating temps, when the fan turns on you know the t state is open, unless you see the radiator level drop, if it does then re top it off, open the screw, let the air bubble out, till a stream of coolant comes out, shut screw, top off rad, cap it, done.