Been scratching my head lately, trying to find the low-side AC port on my 93 Dak 4X4 LE with 318 V-8. Found the high side, then traced the larger upper hose from the dash back to the compressor. Found the low-side port on the right front of the compressor. The fun part was I had to run my R-12 recharge hose under the serpentine belt and just shy of the fan blades to get it on the port. Before the recharge, it was barely cooling and would only do an adequate job on the highway...vent temp never got below 70 degrees F. It slowly lapped up a can of R-12 and now the dash temp gets down to 40 degrees F and stays there. Won't be running it much...only the afternoons, but it's good to know its there cause it's supposed to get over 105 each day for the rest of the week. It robs the truck of power...so I probably won't recalculate the mpg w/AC...don't know if I could stand the shock...it only gets about 12 mpg in town as is without the AC running. No plans to convert to R-134A, unless the old system craters.

 

Cool. Easy fix. R12 is hard to come by at a good price.

 

Yeah, I know what you mean. My confidential R-12 source gave me a good price. Less than $50 for a recharge valve/hose/coupler and two cans of R-12...still have one in reserve. Good thing that most auto AC systems take about 3 cans max.