1) Discussion with client:
-To get pertinent data of issues
-Have any previous repairs been performed?
2) Visual Inspection:
-Have any previous repairs been performed?
-Are there any components not genuine?
-Is there any current and or previous off-road, body or accident damage.
3) How much Freon/Refrigerant (pressure) does the system still have?
-Check compressor clutch by feel, see if it has resistance to turning (if not a Variable Displacement Type Compressor).
-Install the pressure gauge set, see if the pressures might represent how much refrigerant the system has.
4) Confirm Freon/Refrigerant type with high quality identifier.
5) Remove all Freon/Refrigerant into approved recycling equipment.
6) Evacuate system with a vacuum pump and monitor for pressure increase (leakage).
7) Replace both service fittings and/or service fitting Schrader valves.
8) Install 1 lb of Freon/Refrigerant including fluorescent leak check dye (add compressor oil if necessary).
Optional solution: With an empty system, fill it with 1 oz freon and then with nitrogen. Bring nitrogen pressure to 200 psi and check for leaks using sniffer.
9) Perform complete leak detection test including a thorough visual, electronic leak detector and even ultraviolet light inspection if necessary. Don’t forget to check the Evaporator drain.
10) If no leaks are located or observed, continue filling system to capacity utilizing factory recommended fill specification placard under hood or in Workshop Manual. Reference TSB’s (Technical Service Bulletins).
11) Repeat leakage testing same as explained in items #8 and #9.
12) If NO leak(s) observed, test drive automobile and then return car to client.
13) If leak(s) observed, remove Freon/Refrigerant into approved recycling equipment, get clients approval and then repair leak(s). Repeat process.