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Mine does this once in a blue moon, I have a rear mounted griffin with a 5.3. I put it on level ground and take off the top hose on the water pump coming from the radiator, then fill the hose and water pump full of fluid, place hose back on the pump neck and its good to go... I have never had much success with getting air bubbles out of mine by backing up on a hill with the radiator being higher than the engine then trying to fill the radiator to get rid of the air
