Rebuilt front suspension, transmission, steering, engine reseal and the whole works. I reworked the A/C system including a new V5 compressor, GPD part # 6511365 containing new PAG 46 oil (7oz). New evaporator, new liquid line, new manifold hoses, new accumulator, and all new schrader valves.
Condenser has been replaced with a Spectra parallel flow unit, and has two 10 inch fans on it for better cooling.
The blower motor was replaced with the evaporator and I used 3M strip-caulk to re-seal the case to the HVAC module and to seal off the gaps between he evaporator case and the refrigerant lines.
I have had bad luck in the past with GM compressor mounted switches, so I relocated the low cutout to the accumulator (27 PSI off, 44 PSI on).
I used a Ford blue orifice tube, 0.067 I think because the general consensus seems to be to use that for 134a retrofits.
This system is like a GMT400 with the goofy condenser mount orifice tube.
System has a factory fill of 44oz R-12, I charged 36oz R-134a.
System will not pull down much more than 10 degrees full fan outside air, and seems to be not able to get below 58F when at full fan recirc. At lower fan speed, the temps do get lower, as low as 49 when at fan speed 3 recirc at road speed.
I think I did something wrong, so I purchased a 2 channel K- type probe thermometer and attached the probes using zip ties at the condenser outlet and evaporator outlet to get superheat and subcool measurements.
At idle, full fan outside air, the system pressures are 56 low, 226 high, and if I did the math right, that makes superheat of 11 degrees, which is too low to my knowledge, and a subcool of 30, which seems to be very high.
I assumed it was overcharged, so I paid to have the refrigerant recovered ($100) and then charged in 30oz.
The results were 52 low, 220 high, superheat of 12.3, subcool of 28. Vent temps went up as well to 70F.
Before I buy anything else, and pay to recover again, I know I am missing something. I just don't know what that is.
