Quote:
Originally Posted by raleigh753
The car is not loosing coolant , from cold with the level at max and remove and replace the coolant cap to ensure no pressure, the car is used for 2 to 3 days 3 miles each way to work before the coolant low warning level comes on . On checking the level is below the minimum mark . If I remove the cap the pressure escapes and the coolant level returns back to it's original level.I know coolant cannot cmpress and the pressure is not due to combustion gasses so I am at a total loss ?
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There is an air lock somewhere in the cooling system the air bubble is what is compressing . Volvo cooling systems are very good at expelling any air back to the coolant bottle after the first heat/cool cycle . The conclusion must be that a small amount of combustion gasses are building up somewhere in the head . You need to remove the cylinder head to check the head face.