Check vent temperatures and all air conditioning controls inside vehicle
Degas and measure amount recovered from system
Visually check system including:
Compressor condition for security and seizure, drive belt condition
Condenser condition is clean and dry. Condenser fan operating
Evaporator condition for leaks and cleanliness. Check and/or replace pollen filter.
Check water condensation drain tube is clean and free
Check all hoses and pipes, electrical wiring and switches
Replace receiver drier or accumulator and 'O' rings
Pressure test system using OFN (oxygen free nitrogen)
Evacuate system of air and moisture using vacuum pump for 30 mins
Charge system with correct type & amount of refrigerant, add dye and correct type of pag or ester oil
Check running pressures, check condenser fan operation and vent temperatures inside vehicle
Finally leak check system using electronic leak detector
