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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Service Information) >> Plumbing >> Diagnosis and Testing >> Refrigerant System Leaks >> System Low

System Low

  1. Position the vehicle in a wind free work area. This will aid in detecting small leaks.
  2. Operate the heating-A/C system with the engine at idle under the following conditions for at least 5 minutes.
    • Doors or windows open
    • Transmission in Park
    • A/C-heater controls set to outside air, full cool, panel mode, high blower and with A/C compressor engaged
    CAUTION: A leak detector only designed for R-12 refrigerant will not detect leaks in an R-134a refrigerant system.
  3. 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 Chrysler LLC approved refrigerant dye.
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