Grand Cherokee 2WD V6-3.7L (2008)
Refrigerant: Testing and Inspection
REFRIGERANT SYSTEM LEAKS
WARNING: R-134a service equipment or vehicle A/C system should not be pressure tested or leak tested with compressed air. Mixture of air
and R-134a can be combustible at elevated pressures. These mixtures are potentially dangerous and may result in fire or explosion causing
property damage, personal injury or death.
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. Use only approved service
equipment meeting SAE requirements to discharge an R-134a system. If accidental system discharge occurs, ventilate work area before
NOTE: If the A/C refrigerant system charge is empty or low, a leak in the A/C system is likely. Visually inspect all A/C lines, fittings and
components for an oily residue. Oil residue can be an indicator of an A/C system leak location.
NOTE: The only way to correctly determine if the refrigerant system is fully charged with R-134a is to completely evacuate and recharge the
Connect a suitable manifold gauge set and determine if the static A/C system pressure is above or below 345 kPa (50 psi) See: Heating and Air
Conditioning/Tools and Equipment/Refrigerant System Service Equipment. If less than 345 kPa (50 psi), proceed to SYSTEM EMPTY. If greater than
345 kPa (50 psi), go to SYSTEM LOW.
1. Evacuate the refrigerant system to the lowest degree of vacuum possible (approximately -88 kPa (- 26 in. Hg) or greater vacuum) See: Heating and
Air Conditioning/Service and Repair/Refrigerant System Evacuate. 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.
2. Prepare and dispense 0.284 kilograms (10 ounces) of R-134a refrigerant into the evacuated refrigerant system See: Heating and Air
Conditioning/Service and Repair/Refrigerant System Charge and proceed to STEP 1 of the System Low procedure.
3. Position the vehicle in a wind free work area. This will aid in detecting small leaks.
4. 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.
5. 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 approved