Connect a suitable manifold gauge set and determine if the static A/C system pressure is above or below 50 psi (345 kPa). If less than 50 psi (345 kPa), proceed to System Empty. If greater than 50 psi (345 kPa), proceed to System Low.
- Evacuate the refrigerant system to the lowest degree of vacuum possible (approximately 28 in Hg.). Determine if the system holds a vacuum for 15 minutes. If vacuum is held, a leak is probably not present. If system will not maintain vacuum level, proceed to step 2.
- Prepare and dispense 10 ounces (0.284 kilograms) of R-134a refrigerant into the evacuated refrigerant system and proceed to the System Low procedure.
- Position the vehicle in a wind-free work area. This will aid in detecting small leaks.
Operate the heating-A/C system with the engine at idle under the following conditions for at least 5 minutes:
- Doors or windows open.
- Transaxle in Park.
A/C-heater controls set to outside air, full cool, panel mode, high blower and with A/C compressor engaged.
WARNINGA leak detector only designed for R-12 refrigerant will not detect leaks in an R-134a refrigerant system.
- Shut the vehicle Off and wait 2-7 minutes. Then use an electronic leak detector that is designed to detect R-134a refrigerant and search for leaks. Fittings, lines or components that appear to be oily usually indicate a refrigerant leak. To inspect the A/C evaporator for leaks, insert the leak detector probe into the drain tube opening or an air outlet. A dye for R-134a is available to aid in leak detection. Use only DaimlerChrysler approved refrigerant dye.