After all refrigerant system leaks have been repaired and the refrigerant system has been evacuated, a refrigerant charge can be injected into the system. For the proper amount of the refrigerant charge, refer to the underhood HVAC Specification Label.
- Evacuate the refrigerant system as outlined in this section.
- A manifold gauge set and an R-134a refrigerant recovery/recycling/charging station that meets SAE standard J2210 should be connected to the refrigerant system.
- Measure the proper amount of refrigerant and heat it to 125° F (52° C) with the charging station. See the operating instructions supplied by the equipment manufacturer for proper use of this equipment.
- Open both the suction and discharge valves, then open the charge valve to allow the heated refrigerant to flow into the system.
- When the transfer of refrigerant has stopped, close both the suction and discharge valves.
If all of the refrigerant charge did not transfer from the dispensing device, open all of the windows in the vehicle and set the heating-A/C system controls so that the A/C compressor is engaged and the blower motor is operating at its lowest speed setting. Run the engine at a steady high idle (about 1400 rpm). If the A/C compressor does not engage, test the compressor clutch control circuit and repair as required.
Open the low-side valve to allow the remaining refrigerant to transfer to the refrigerant system.
CAUTIONTake care NOT to open the discharge (high pressure) valve at this time. Failure to follow this warning could result in possible personal injury or death.
- Disconnect the charging station and manifold gauge set from the refrigerant system service ports.
- Reinstall the caps onto the refrigerant system service ports.
- A complete air conditioning service center for R-134a will be needed.
- Remove A/C refrigerant system service caps.
- Attach the high-side hose with the quick disconnect coupler to the high-side fitting of the vehicle's A/C system.
- Attach the low-side hose with the quick disconnect coupler to the low-side fitting of the vehicle's A/C system.
- Close the low-side valve on the control panel.
- Open the high-side valve on the control panel.
- Refer to the manufacturer's instructions for the charging station in use.
- Enter the amount of refrigerant needed to charge the A/C system.
- Install 1.10 lbs. of R-134a refrigerant.
- Close the high-side valve on the unit's control panel. Both valves should be closed.
- Start the vehicle and the A/C system.
- Let the engine run until the readings on the high-side gauge and the low-side gauge stabilize.
- Compare the readings to the system specifications.
- Check the evaporator outlet temperature to ensure that the A/C system is operating within the system specifications.
- Keep the A/C running.
- Close the high-side coupler valve.
- Disconnect the high-side hose from the vehicle.
- Open the high-side and low-side valves on the control panel. The system will quickly draw in refrigerant from both hoses through the low-side hose.
- Close the low-side coupler valve.
- Disconnect the low-side hose from the vehicle.
Reinstall the caps onto the refrigerant system service ports.
NOTEAny oil removed from the A/C system during the recovery process must be replenished