Re: AC high pressure switch
Originally Posted by Frango100
Older WJ 's use a low and high pressure switch, while newer ones have a pressure transducer. Your jeep was most probably made during that transition period. Since your AC compressor still cycles, it seems that the transducer still works.
Do you get cold air from the AC? Any change while driving?
Mine has both the low pressure cutoff (on the accumulator) and the transducer. It appears that the transducer serves two functions - high pressure cutoff and signal to PCM for the hydraulic fan.
When I was attempting to charge my system last weekend, my high side pressures got over 300 and I had no cold air and no cooling fan. I installed a new transducer last night and proceeded to charge the system. As soon as my high side got to 200, the fan started picking up speed and I immediately got a reduction in my vent temps. Continued to push R134 into it and got my low side up to about 40 and high side settled at about 225 and the fan was moving full speed at that point and I got nice 42 degree air when the ambient temp was 95.
According to my data tag, my build date was 08/2000. That seems early in the 2001 production year to have a transition. But now I know that I may need to look at model year 2002 sensors for certain things.
Thanks for the help everyone!
87 Grand Wagoneer, 6.5 turbodiesel, 700R4, 229
99 XJ Limited, 4.0, Auto, 242
01 WJ Laredo, 4.7, Auto, 242