You might consider next time the Freon leaks out of your AC system, just get a set of seals if you know it is not parts leaking and replace them.
Refrigeration Technologies RT201B Nylog Gasket/Thread Sealant $8.63
26729 O-Ring & Gasket Air Conditioning System Seal Kit $7.21
Four Seasons 26775 Cap & Valve Air Conditioning System Seal Kit $7.87
(Back when I got the car 12 years ago the freon was leaking slowly and the HI pressure valve was leaking, then recently last few months, the control valve went south)
FJC 2490 PAG Oil - 8 fl. oz. $7.64
I was able to get to most seals (Orifice tube and a few under the Master cylinder/ABS too much to remove and probably will force brake and fuel line replacement)
I chose to replace the seals for the Accumulator (20 year old parts, cheap to replace since I had the system open.), Condenser, cap and valve and compressor seals, tried the bolt for the evaporator on the firewall, but was not turning so left it also left the HI pressure switch. I removed the compressor and removed the Compressor Control Valve and replaced the seals on the part. (read that these seals generally go and mechanics would rather sell you a 400$ compressor than simply replace a $30 part or even simply replace the seals on the valve.)
My symptom was the low pressure started going too high and would never drop below 60PSI. I ended up bleeding all the Freon out trying to drop the pressure. I read that it was the control valve in the compressor that was leaking pressure causing higher pressure level.
After I removed and replaced as many of the seals that I could reasonably get to, with my copmpressor, I blew into each end of the parts to see if trach came out or it was clogged. All blew OK and no trash.
I Then pulled a vacuum and it held for an hour. Refilled and now it is all cold.
You can Rent Gauges and vacuum (I got mine from Autozone.
Other optional parts:
UAC RD 1792C A/C Accumulator $11.38
While I have the compressor out, I cleaned it up, re-taped the wiring covering going to the compressor and also replaced a leaking front engine mount.
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