134 won't charge any further

[rich.weber]

OK, got a gauge set with both high and low side gauges. I hooked them up and measured my low and high side pressures at about 50 and 90 respectively. I added pressure until my low side read about 90, expecting the compressor to kick in and drop it, and for the high side to start going up to what it's supposed to be (around 250 in this heat). It just stopped at about 90 low side and 95 high side and won't go up any more, and the compressor does not kick in to drop the low side. The clutch it seems doesn't wanna kick in, I guess? Any ideas what else might be wrong that I could try to fix it? Some trouble shooting Ideas? Rich

Register today or sign-in to remove these ads!

[Steve83]

If you have 40psi difference with the compressor off, then you have SERIOUS problems in the A/C system.

But it sounds more like you didn't open the valves on the gauges (normal direction), or the ones on the ends of the hoses that connect to the fittings. Most hose valves have to be screwed IN to open (contra-intuitive).

[projectSHO89]

The pressure inside a sealed sytem is the same everywhere when the compressor is not operating (given time to equalize). Any difference in readings has to be due to the gauges or measurement technique.

If you have 90 psi in the system but the clutch doesn't engage, you have either an electrical circuit fault or the clutch is bad (usually excessive air gap).

In order to further provide advice, you have to specifically identify your vehicle. There are differences in the circuitry over model years and sub-models.

Steve

[zziggy]

electrical
fuse, clutch cycling switch, hi-pressure switch, etc is defective.