Hello,
I bought a 74 F100 with a later model engine using a FS10 compressor, TXV, & parallel flow condenser of original size. The previous owner never tried making AC work. The compressor & condenser & evaporator were on the truck & they dont look new, but they were capped off. I removed compressor, drained 6oz oil & refilled with 6oz of new pag46. I replaced TXV & drier, made hoses, evacuated for couple hours & charged with 2 cans. Original r12 capacity shows 2lbs. My understanding is less r134 is needed when converting. Vent temp of 55 measured with ambient of 85. After running for 15min, low side 15-20, high side 275-300. I didn't want to add more refrigerant and drive up the high PSI. Used thermocouple clamp for the following line temps in degrees: Compressor In 70, Out 165. Condenser In 158, Out 123 (after drier as it's connected to condenser). Evaporator In 43, Out 55. I can get my hand in the heater box inside truck and feel the evaporator. It's cold at the bottom 1/4 only. The rest is not cold, only cool. Is the entire evaporator on a TXV system supposed to be ice cold?
BTW I tried attaching the TXV bulb to the evap outlet on top & at 9 oclock but it didn't seem to make any difference. Also it was clamped using a typical hose clamp (couldn't find the metal type clip) & was wrapped in cork insulation tape.
Any suggestions or advice would be appreciated.
thank you,
Ray