ok so heres the deal had the heat working car ran great then parked it went to drive it and heat stopped working shortly into driveing and couple miles later its doing the same thing and im freezing my ass off in this 58 new england weather
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why is my m42 still over heating?
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I've been air locked.
I generally follow the same instructions as these guys, but I reverse fill the upper radiator hose. I fill the upper hose with coolant (which fills the head directly) until the hose itself is almost full, then attach the hose to the radiator. Then I'll run the car, and "massage" the lower radiator hose. You should be able to hear the coolant squirting from the upper hose into the radiator. The lower hose should remain cool until the thermostat opens and circulates the hot coolant.. then you should check the radiator and fill the reservoir.
I've done this like 3 times in the last 2 months trying to find a coolant leak, no problems. It was coming from my thermostat housing.
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