The A/C compressor clutch does not disengage when the A/C switch is off (2020 2021)

Diagnostic Procedure 

Probable cause: The A/C compressor clutch circuit is on (energized) continuously, shorted to ground, stuck A/C compressor clutch relay, or the A/C compressor clutch is mechanically jammed

Do the A/C compressor clutch check , and repair any problems with the A/C compressor clutch

Also Check for 

The A/C compressor relief valve. If it has vented refrigerant to the atmosphere, correct the problem with the A/C compressor clutch or the A/C compressor clutch circuit, then replace the A/C compressor relief valve