also forgot to say, dont use the stop leak stuff.. it will not work on the valve.. the high pressure valve is suppose to blow so the system does not blow.. i read this either in the ford CD or some place, but i checked the old valve and you could see where the metal piece inside it moved to allow the freon to come out.. i guess its alot cheaper to replace a valve than the replace either a hose or coil. so it was a good design.....
