Future Servicing of Retrofitted Vehicles

1. SYSTEM IDENTIFICATION
Always use caution when servicing an air conditioning to avoid refrigerant or system contamination. Identify the refrigerant type before connecting any service equipment. Check for R-134a service ports, R-134a labels on the Receiver/Drier (See Figure 1). The system may have been retrofitted using non-Isuzu components or procedures. Always look for signs of a previous retrofit. Do not rely only on proper labeling of the vehicle.

2. USING THE CORRECT PARTS
When replacing a malfunctioning Receiver/Drier on a previously retrofitted system, always replace with the R-134a type. (Refer to R-12 to R-134a A/C Conversion/Retrofit Parts Application Chart)

- Always replace with the original R-12 type, whenever the following components need replacement on a previously retrofitted system:
- A/C Compressor
- Condenser
- Pressure Switches
- Expansion Valve
- Thermostat
- Evaporator
- O-rings
- Hoses/Pipes (if only an adapter was installed during the retrofit)

IMPORTANT:
Use R-134a type if the entire hose/pipe was replaced during the retrofit.

3. OIL ADJUSTMENT DURING REPAIR

When replacing a compressor, always completely drain the oil from the new service part compressor and add the appropriate amount of PAG oil according to the oil adjustment procedure as outlined in Section 1 of the appropriate Workshop Manual.





When replacing an evaporator core, condenser, or Receiver/Drier, always add the specified amount of the appropriate PAG oil according to the chart.

NOTE:
Once the retrofit procedures are completed, R-134a Recovery, Recycling, Evacuation, and Recharging procedures should be used.