Quote:
Originally Posted by Abarine
Ever hear of that before? I work with pumps and boilers, and it makes sense (we call it air lock), but I'd not realized it could happen in car radiators.
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Sure does, all the time. My Vette is a bear to get all the air out. Jack up the front, take off the radiator cap and let the engine idle till the thermostat opens up then hold down the throttle cable to get the revs up. The water will now be sucked into the engine lowering the water level in the radiator so while the engine is reved up, with your other hand hand pour antifreeze/water mixture into the radiator cap opening. When it's filled put the cap back on (engine still at high revs). It's about the same procedure for a lot of cars to get it filled up without any air.
I found out about the air bubble when I needed the interior heat on one cold night. NO heat. The car didn't overheat before that so I guess the air pocket was in the heater part of the system.