R-134a Systems

SYSTEM EMPTY
Do not pressure test the R-134a system with compressed air. Some mixtures of air/R-134a refrigerant have been shown be to combustible at higher pressures. Use leak detector designed for R-134a systems.
1. Evacuate A/C system.
2. Prepare 10 oz. R-134a refrigerant charge to be injected into system.
3. With engine Off, use an Electronic Leak Detector designed for R-134a system and inspect for leaks. Fittings, lines or components that appear to be oily may indicate a refrigerant leak. To inspect the evaporator core for leaks, it is possible to insert the leak detector probe into the recirculating air door opening. With the blower at low speed and the selector in FLOOR and RECIRC mode check for leaks at left and right heater outlets. If no leak is present, fill system as outlined under Performance Test.

LOW LEVEL
1. Start engine with A/C On for five minutes to allow system to reach operating temperature and pressure.
2. With engine Off, use an Electronic Leak Detector designed for R-134a system and inspect for leaks. Fittings, lines or components that appear to be oily may indicate a refrigerant leak. To inspect the evaporator core for leaks, it is possible to insert the leak detector probe into the recirculating air door opening. With the blower at low speed and the selector in FLOOR and RECIRC mode check for leaks at left and right heater outlets. If no leak is present, fill system as outlined under Performance Test.