134 gets as cold as r12... just not as fast.

 

[/align][/align]Hello 4x4BlazerGuy, I was hoping you'd be able to clear something up for me.[/align][/align]Now I currently drive a 90 S-10 Blazer 4x4 w/ the 4.3l V6. It has, believe it or not, 255k miles and runs like a champ....it was my grandparents old rig that they towed behind their motorhome and/or used around the mountains in Yakima, WA. It gets hot in the summers for sure, and nice and snowy in the winters. I know they were ritual about maintenance as I have receipts that I was able to find in the glovebox. The A/C system still works, and while it blows fairly cold, it's not cold like my gf's 97 Taurus. Just today I purchased a kit from WalMart called the InterDynamics EXChill R-12 to R-134a Conversion Kit.The kit includes adapters, 3 bottles of R-134a (for high mileage, leak sealer andEster oil already mixed in) anda pressure guage.The kit claims that I need to simply have the old R-12 evacuated and then plug in this R-134a kit per the instruction/CD-ROM that came w/ the kit. My questions are this though....[/align][/align]1) For some reason, I can run the trucks A/C for hours and keep the interior mildly colder than the 90+ weather here in Boise IF i'm gentle on the gas...ie - no hard stabs off the line, downshifting to pass, etc. If I do, the fuse blows and the entire heater shuts off. I've ( I know, I know) run a wire instead of a fuse, and just stay gentle on the gas. Could this be a symptom of the truck just needing more refrigerant/oil maybe? The next question may help w/ the first....[/align]2) I temporarily connected the conversion kit connector to the low side so I could read the pressure of the truck. I have attached a picture of the pressure guage that came w/ the kit. I started the truck, let it idle for about 5 minutes w/ the A/C on full, connected the pressure guage, and got a reading of 34psi, which is in the middle of the FILLED blue area of the guage. The compressor would do a little of both, either running all the time, or cycling....if I hit the gas when it was always on, it cycle again for a few mnutes then stay on all the time. While driving, it DOES cycle though. IF I unplugged the little connector on top of the compressor while in the garage, the compressor would obviously shut off....but I also noticed the pressure would start to creep into the WARNING zone on the guage, which starts at 65psi. Now, is this a normal pressure for R-12, and also is it normal for the pressure to increase after disconnecting the power to the compressor? One thing that i wanna note, which kinda confuses me as to which way the guage SHOULD re