A/C System Overview and Service Information
A/C Refrigerant System (R-134a), Overview and General Service Information
NOTE:
- A/C system components identified with an * must only be serviced or replaced after discharging refrigerant system.
- Discharging refrigerant system.
- A/C system cooling performance test.
- Refrigerant system pressure test.
- A/C system components, engine compartment.
- Do not top-off a charged refrigerant system. Instead, discharge, evacuate and recharge system.
1 - Compressor*
- 6-cyl. engine equipped with Nippondenso compressor
- 4-cyl engine equipped with Zexel compressor
- Ribbed drive belt removing and installing 6-cyl. engine
- Ribbed drive belt, removing and installing 4-cyl. engine
- O-ring: Low pressure connection: 17.2 mm inside diameter 1.8 mm thickness; High pressure connection: 14.0 mm inside diameter 1.8 mm thickness
- Tightening torque: Low pressure connection: 40 Nm (30 ft lb); High pressure connection: 30 Nm (22 ft lb)
Notes on compressor servicing:
- Replacement A/C compressors are filled with 250 cc (8.5 fl oz) of A/C refrigerant (PAG) oil. This is the total A/C refrigerant system oil capacity.
- Zexel and Nippondenso refrigerant (PAG) oils are different.
- Zexel and Nippondenso compressor ribbed drive belts are different.
Always refer to recent parts information.
- Mark travel direction of ribbed drive belt before removing. Reversing direction may cause belt damage.
- If a new A/C compressor is installed, or if oil was added to compressor; manually rotate compressor 10 times before operating the system to prevent compressor damage.
2 - A/C clutch -N25-
3 - Oil drain plug*
Zexel compressor:
- O-ring: 7.8 mm inside diameter 1.9 mm thickness
- Torque: 10 Nm (7 ft lb)
Nippondenso compressor:
- Installed with sealing ring instead of O-ring
- Always replace sealing ring
- Torque: 30 Nm (22 ft lb)
NOTE:
- Remove only with compressor removed from vehicle.
- Use to drain or add PAG refrigerant oil, or to check the amount of oil in the compressor.
4 - Pressure relief valve *
- O-ring: 8.8 mm inside diameter 1.9 mm thickness
- Torque: 10 Nm (7 ft lb)
CAUTION!
Refrigerant system must be discharged and compressor removed prior to removal of oil drain plug and pressure relief valve. Use drain plug to drain/add oil to compressor and to check amount of oil in compressor.
5 - Connection with Schrader valve*
6 - A/C pressure switch -F129-.
7 - Condenser*
- O-ring, inlet: 14.0 mm inside diameter 1.8 mm thickness
- O-ring, outlet: 7.6 mm inside diameter 1.8 mm thickness
- Torque: Inlet: 30 Nm (22 ft lb) Outlet: 15 Nm (11 ft lb)
8 - Coupling*
- O-ring: 10.8 mm inside diameter 1.8 mm thickness
- Torque 15 Nm (11 ft lb)
9 - Cap with seal
- Always reinstall after using service valve
10 - Service valve (high pressure)*
- Used for checking system pressure, discharging, evacuating and recharging system
11 - Restrictor*
- O-ring: 7.5 mm inside diameter 1.5 mm thickness
- Removing and installing
- Always replace O-rings
- Lightly coat restrictor O-ring with refrigerant oil before installing
12 - Evaporator*
- Removing and installing refrigerant lines
- Removing and installing heater/air conditioner assembly
- Disassembling heater/air conditioner assembly
13 - Service connection (low pressure)*
- Used for checking system pressure, discharging, evacuating and recharging system
14 - Cap with seal
- Always re-install after using service valve
15 - Accumulator*