Those that watched my 72 Duster for my daughter build a few years ago may realize or remember that I struggle with the factory air conditioner and I was hell-bent to make it work. It never worked well the pressures were high to the point where the clutch would slip and I just couldn’t figure it out. Well I’ll have to say over the last month I found an AC Guru that actually encouraged me and helped me over the hump to learn the pieces of information that I was missing on air conditioning. I finally have this air conditioning working amazing. The aftermarket TVX valves are for the most part junk but I found a Murray style that can be adjusted to the point where the factory AC with R134 will hang icicles off the ducts. I’m a couple months away from having the Valiant build with factory air-conditioning to the point where I should be trying to get the AC working. That point I will make a video and or an article to post here on how to actually measure and dial in your air conditioning system. If you expect to just bolt on new parts and use some rule of thumb for charge amount and expect it work well you will likely be disappointed. For those who know air conditioning you will know the importance of those two numbers for superheat and sub cooling. With out-of-the-box parts the super heat was 76° And with a charge based on the 85% rule the sub cooling was in the 50° range. The charge was based on the sub cooling number to get about 20° and the TBX was adjusted to get about 20° superheat and now this AC system will freeze you out And the pressures are low low low
