I attempted to recharge the system. But the gauge shows 0 PSI when the car is turned on, with the AC on full blast. When the car ignition is off, the pressure gauge shows at about 40 PSI, in the green. I decided to make a dumb move, to want to fill to 50 PSI to the max where it shows in the green. ...

I seem to remember by design - for safety issues - that some outside air always had to be let into the cabin area...

When its bypassed, it gets the vents down to 35F, of course because its freezing down there. I personally would not monkey again with the expansion valve or the refrigerant charge, as great cooling occurs if the switch is bypassed or is "closed". I'd focus on the thermo switch which needs...

Tim - I posted the following previously on his Facebook inquiry, so re-posting here so members on this site could can comment if desired. On his truck, the air path goes from inlet to blower fan through evaporator so is before the heater box. So the only source of heated air at this point getting i...

digeratimvp wrote:I dread taking the bottom of the evap case apart, but I will do it and move it really close to the top and see what happens before I order an adjustable one.

Wear eye protection and don't lose any of the little clips holding the bottom part on !!!

About 30 ounces of R-134a does seem a little light. I think it should be around 32-38 ounces based on the R-12 spec. Did you weigh-in the charge or estimate using the small cans? If the latter, it's possible that you charged more than you thought. The pressures look pretty good now. What are the ve...

Maybe someone sealed off the lines to the rear evaporator on the Suburban?

Yep; fixed, and I donated.

Next time buy from Tim at Arizona Mobile Air !!!

I've bought at least three compressors and an evaporator from Arizona Mobile Air for various vehicles over the past 2.5 decades. And I bought a vacuum pump from them for my work laboratory.

I tried to register and donate today, and when I tried to check out, software wanted to charge me for delivery. So I'm confused.