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Message: <blockquote data-quote="jarance" data-source="post: 723210" data-attributes="member: 21">The cooling system should not be pressurised when the engine is cold.It will be pressurised when the engine is HOT.The only possible reason for the pressure to built up is there is leak from the combustion camber to leak into the coolant chamber.As mentioned earlier, it could be due to head gasket failure or crack engine head or crack water channel.Most likely the cause is head gasket failure as there is no sign of oil in the radiator.This problem arises due to previous overheating and cold water is added to the radiator before the engine cooled down causing the cylinder head to warp.Open the radiator cap and try to smell for unusual odor.</blockquote>