HVAC Components, Engine Compartment

A/C refrigerant system (R-134a), components






HD = High-pressure side
ND = Low-pressure side


NOTE:
- Replacement A/C compressors supplied by Parts Dept. contain the total quantity of refrigerant oil for filling the refrigerant system: 250 cc (8.5 fl oz)
- Testing A/C system cooling performance.
- Do not top-up refrigerant system by adding any refrigerant (drain system, evacuate and re-charge).
- O-ring diameters and tightening torques stated also apply to the threaded connections of the refrigerant line between individual components. Install only O-rings which are approved for R-134a refrigerant (identified by color coding, at present red or violet).
- Check pressures in the refrigerant system.
- Servicing work on A/C system.
- For vehicles with Nippondenso compressor, it may be necessary to blow compressed air and nitrogen through the refrigerant circuit between accumulator and compressor in the direction of flow of the refrigerant.


CAUTION!
- Mark direction of travel for the ribbed belt before removing. Reversing direction could cause the belt to fail.
- If a new compressor is installed, or if oil has been added, manually rotate the compressor 10 turns before operating the system to prevent compressor damage.
- Make sure that A/C refrigerant lines are properly insulated from exhaust system heat.

1 - Compressor
- Remove refrigerant lines from Nippondenso compressor (with O-ring and tightening torques of fastening bolts).

NOTE:
- Removing and installing ribbed V-belt and checking alignment of belt pulleys
- The piston stroke of compressor is variable and is set as a function of cooling performance required.

2 - A/C compressor speed sensor -G111-
- Not applicable for vehicles with Nippondenso compressor
3 - A/C clutch- N25-
4 - Oil drain plug
- 30 Nm (22 ft lb)
- Installed with sealing ring instead of O-ring
- Always replace sealing ring

NOTE: Turn A/C compressor via A/C clutch in order to drain the oil faster

5 - Pressure relief valve
- O-ring: 8.8 x 1.9 mm
- 10 Nm (7 ft lb)
6 - Connection with valve
7 - A/C refrigerant high pressure switches -F23- and -F118
8 - Condenser
Intake connection:
- O-ring: 14.0 x 1.8 mm
- 30 Nm (22 ft lb)
Outlet connection:
- O-ring: 10.8 x 1.8 mm
- 15 Nm (11 ft lb)
9 - Cap with seal
- Always reinstall over valve
10 - Service connection
- For measuring, draining and recharging
11 - Threaded connection in refrigerant line
- O-ring: 10.8 x 1.8 mm
- 15 Nm (11 ft lb)
12 - Restrictor
- Always replace restrictor (with O-ring)
- Coat O-ring with PAG oil before installing
13 - Evaporator
O-rings for A/C refrigerant lines:
- Intake: 10.8 x 1.8 mm
- Outlet: 17.2 x 1.8 mm
O-rings (for refrigerant lines on evaporator intermediate piece):
- Intake and outlet: 13.4 x 2.4 mm
Tightening torques:
- Central bolt (refrigerant lines at air conditioner housing): 25 Nm (18 ft lb)
- Bolts at evaporator: 5 Nm (44 in. lb)
14 - A/C refrigerant low pressure switch -F73-

NOTE: To test, bridge electrical connections in harness connector for removed A/C refrigerant low pressure switch -F73-.

15 - Connection with valve
- For A/C refrigerant low pressure switch -F73-
- For measuring pressures
16 - Accumulator
- O-rings: 17.2 x 1.8 mm
- 40 Nm (30 ft lb)
17 - Connection with valve
- Not applicable for vehicles with Nippondenso compressor
18 - Cap
- Not applicable for vehicles with Nippondenso compressor