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Your high side pressure is to high. The refrigerant needs to be operating at the right pressures in order for the air-con to function properly:
If the pressure is too low, there is risk of compressor damage in addition to lack of cooling
If the pressure is too high, the effectiveness of cooling diminishes at the very least
To avoid hitting issues related to this, modern air-conditioning circuits are equipped with a pressure switch/sensor. Its job is to protect the system from self-destruction by preventing the AC from running under the wrong conditions.
It's likely low on refrigerant and freezing...turn it off, coil thaws , cools for a short time and freezes up again. Chances are the leak or leaks are at the flares where the copper connects to the unit. Need leaks repaired and systems recharged.
Stop blowing cool or stop blowing anr air through the vents??? If it stops blowing cool air, check if the condenser fan is running (it should be)( on drivers side under hood, looks like a small radiator) if not take a water hose and deluge the condenser with water, if it then cools, you will need a new condenser fan assembly.
sounds like they cant find the problem, i dont think an 03 would have that kind of wiring problem, i think there guessing, could be a bad compressor, but hard to say without checking it . good luck, maybe its time for a 2nd shop to look at it.
If your fan motor is slowing or stopping mid cycle it will cause the compressor to over pressurize. Many compressors have aan internal mechanism that will kick in with a loud whooshing noise, then the Thermal protector shuts the compressor off, cools then restarts. If this sounds familiar, you will need to replace your fan motor before you burn up your compressor...which to be honest may already be irreparbly damaged(sorry). Hoping 4 the best.
There are special cans of R-134A with dye in them for detecting leaks. Most leaks occur around the fittings near the compressor. Recharge the system with the leak detector can or R-134A. There are also cans of R-134A with an additive to stop leaks. I would use these products to either detect your leak or to stop it. Best of luck.