Rweaver428 wrote: ↑Sat Apr 20, 2024 7:42 am I will gladly scan the Clardy docs and attach them if it would help someone.

I'm curious about the original R-12 spec...I would guess about 3 pounds.

From outward appearances, your original TXV looks pretty good. Hopefully, the internal sealed and charged portion is intact as well. The refrigerant doesn't "matter" to a TXV. I believe there is sophisticated equipment that not many people have to verify a TXV's operation. Best option for ...

I have the original installation instructions, charging instructions, and parts diagram. That's "gold." Be sure to hang onto it. I would like to replace the original expansion valve with a new one, but I’m not sure which one to get. Unless the original TXV is corroded or otherwise damaged...

I forgot to mention the specs that I have for your car: 16 ounces net weight of R-134a, and 4.4 fluid ounces of PAG-46 oil. However, if your car still has its under-hood A/C decal, go by those specs instead because the decal takes precedence.

A reading on the low side of 21 PSI at 1,500 RPM translates to an evaporator temperature (coincidently) of about 21°F, which will cause the evaporator to freeze-up and block airflow through the vents under certain conditions. It's also an indication that the system is undercharged. The Schrader valv...

I agree with the preceding comments. It appears to be low on refrigerant. Have the refrigerant recovered, then the system evacuated and recharged to specs, adding back the proper amount and type of oil if any was recovered along with the refrigerant. The ambient temperature is a bit low for MVAC wor...

The system is bumping into the High Pressure Cut-Off (HPCO). A few issues can cause that. Foremost is a blocked Orifice Tube (OT) that can prevent circulation of the refrigerant and oil and cause extremely high pressure to build up on the high side, which you noticed. The OT itself is inexpensive. H...

Has the compressor been replaced recently, and was it a brand-new unit? If so, what else was done at the same time, if anything?

I believe your car has a variable-displacement compressor. If so, you could try replacing only the compressor's control valve first. But with that amount of mileage on the car, I too would go ahead and replace the entire compressor/clutch assembly. I strongly recommend replacing both the condenser a...

After one hour, the HP and LP sides should equalize. If they don't, the cause is usually a defective metering device—in this instance, the TXV—and/or a blockage someplace. Presuming a full charge of refrigerant, if you're seeing only 100 PSI on the high side at an ambient temperature of 76°F, it doe...