A/C Does Not Work Sufficiently

Check for improper charging amount.
Check for open A/C magnetic clutch
Check for open circuit between A/C relay and A/C magnetic clutch.
Check for poor ground of A/C magnetic clutch.
Check for refrigerant pressure switch stuck open.
Check A/C relay stuck open.
Check for seized A/C compressor.
Check for open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier.