Review on Enhance Cooling Performance with GM Genuine Parts 15-1119 Air Conditioning System Valve Core by Muhamed Hogan

I replaced all the main valves while flushing, cleaning and rebuilding the AC system from start to finish in my trusty Silverado. Her initial AC lasted 18 years before giving her last full height. The 250 µm system was pressure tested with nitrogen at 120 psi for three days. Zero leaks and an almost muffled roar when everything is perfect and nothing fails. Big tip for long-term success: Don't use PAG oil to wipe down seals and gaskets. They require oxidation/corrosion creep as the aluminum tubing and components have already undergone hundreds of heat/cool cycles. Aluminum always oxidizes. If moisture gets in, since PAG oil soaks up moisture, you're in borrowed time. I've been using GM Seal Conditioner since the R12 days. It was one of the finest air conditioners ever made. I expect the new AC system will last another 15+ years. When you reach the desired vacuum level, also add refrigerant from the high pressure side. It is easy to perform and the laws of gas and liquid physics will help you with an accurate and controlled charge cycle. I can post a pico setup made with this little 12oz can of R134a. Also, don't pull a vacuum if you can avoid it with these manifold settings. Separate vacuum and separate charge lines. Just a few FWIW tips. It pays to do your homework and become a winner. World.