If the A/C system is not cooling properly, determine if the refrigerant system is fully charged with R-134a by performing a Refrigerant System Charge Level test or by completely evacuating and recharging the A/C system. Follow the instructions on the manufacture-s R-134a refrigerant recovery/recycling/charging station to perform a charge level test. If the A/C liquid line pressure is found to be less than 50 psi (345 kPa), proceed to the System Empty procedure below. If the liquid line pressure is found to be greater than 50 psi (345 kPa), proceed to the System Low procedure. If the refrigerant system is empty or low in refrigerant charge, a leak at any line fitting or component seal is likely. Inspect the fittings, lines, and components for oily residue to indicate a leak location.
- Evacuate the refrigerant system to the lowest degree of vacuum possible (approximately 28 in. Hg.). Refer to Evacuating the System.
Determine if the system holds a vacuum for 15 minutes.
- If a vacuum is held, a leak is probably not present.
- If the system will not maintain vacuum level, proceed to the next step.
- Prepare and dispense 10 ounces (0.284 kilograms) of R-134a refrigerant into the evacuated refrigerant system. Refer to Charging the System.
- 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 five minutes:
- The doors or windows should be open.
- The transaxle should be in Park or Neutral with the parking brake set.
The A/C-heater controls should be set to outside air, full cool, panel mode, high blower, with the A/C compressor engaged.
WARNINGA leak detector that is designed for R-12 refrigerant only, will not detect leaks in a 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 Daimler Chrysler® approved refrigerant dye.