Low Refrigerant Level Leak Test

1. Determine if there is any (R-134a) refrigerant in the system. Use the scan tool (DRB III) under the menu Systems Sensors-A/C Pressure test or pressure gauge liquid line temperature partial charge check. See system charge level check or fill for procedure.
2. Position the vehicle in a wind free work area. This will aid in detecting small leaks.
3. Bring the refrigerant system up to operating temperature and pressure. This is done by allowing the engine to run for five minutes with the system set to the following:
- Trans axle in Park
- Engine Idling at 700 rpm
- A/C Controls Set in 100 percent outside air
- Full Panel Mode
- Blower motor ON HIGH
- A/C in the ON position
- Front Windows Open.
- Rear Air Off (If Equipped)

CAUTION: A leak detector designed for R-12 refrigerant will not detect leaks in a R-134a refrigerant system.

4. Shut off the vehicle and wait 2 to 7 minutes. Then use an Electronic Leak Detector that is designed to detect R-134a type refrigerant and search for leaks. Fittings, lines, or components that appear to be oily usually indicates a refrigerant leak. To inspect the evaporator core for leaks, insert the leak detector probe into the recirculating air door opening or a heat duct.

If a thorough leak check has been completed without indication of a leak, proceed to System Charge Level-Check or Fill.