WilliamK1974 wrote: ↑Tue Apr 27, 2021 12:30 pm I hooked up a set of manifold gauges, and they showed that the low side would either be at zero or pulling a vacuum, and that the high side could go up close to 300.

To me, this is the biggest clue.

And note that sight glass is really not too useful on 134 systems.

I think I'd also lean towards brand-new compressor. But since you have used parts available, and the compressor shaft turns and you say it appears to contain your R134a, you're not out much to try your used parts.

Fluid pressure is about 30 psi on low side when compressor is engaged. Any input or ideas would be greatly appreciated. Need high side pressure when running at about 1800 rpm. If you don't have such service gauges, then silly to try to diagnose yourself. When I put the temperature selection to a hi...

Honeywell has a monopoly Automotive refrigerants that leak out of A/C systems contribute very little to the overall global warming problem, only about 0.14% according to scientific estimates. Even so, when you multiply the millions of vehicles that are AC-equipped times even a small amount of refrig...

1. There are aerosol cans of AC flush available at parts stores, then use your compressor to blow off any remaining solvents. I think one of the sponsors of this site sells kits fro professional mechanics. 2. I don't know specifically about your vehicle, but bad actuators could cause air to get defl...

To me, it's just so weird that low-volume vehicle manufacturer Jaguar would use such a specialty schraeder valve in the first place !!!

Go to a higher-end bike shop. Ask to see some brake shims. ACE Hardware also. .... there are several ACE Hardwares. What exactly would I be looking for there? Brake shims as well? Just look through all the little drawers, stuff sometimes has "interesting" names. Did you actually test your...

How about
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Time to get a new compressor !!! Check with ackits.com, the sire sponsor.

I would think that there are modern controls that could work. Some modern systems work by pressures, some might work using electronics. I believe most systems once "on" have the driver "add heat" to make the temperature comfortable. Systems like in my '88 Mazda truck and '98 and ...