I am talking about the cylinder that sits between the radiator and the front bumper. It has the glass freon "view window" on top of it. It also has the HIGH valve from the A/C running from it, too. The reason I am asking is because it is leaking freon from the top of it. I tried tightening up the screws on top but it continued to leak. The part that is leaking is the assembly that has the A/C high valve and another screw beside it. That is the screw that I tried to tighten, but to no avail, it continued to leak. Any help?? Any suggestions (perferably cheap suggestions)?? Anyone??? It is a 1991 Sedan.