Operation and maintenance manual

Section 260-0130
SM 1405 Rev 2 11-04
9
Operators Compartment - Air Conditioning
Only new oil should be used, because oil that has been
exposed to the air will have absorbed water
(hygroscopic).
Use only refrigerant oil as specified in Section
300-0020, LUBRICATION SYSTEM.
System Leak Testing
Recommended Equipment Required:
Electronic Leak Detector
Switch off the engine and check all connections
throughout the system for leaks. A large leak point
will have an oily or greasy appearance. The
refrigerant carries compressor oil with it and deposits
it around the leak area. Check all such points for
loose connections and tighten.
Using a suitable leak detector, search for leaks
around all joints, connections, seals and control
devices. If a leak is located, purge the system of
refrigerant and repair. Fully evacuate and charge the
system to make it operational.
DISCHARGING THE SYSTEM
Note: Refer to all WARNINGS listed under
'Maintenance' prior to discharging the system.
Recommended Equipment Required:
Portable High Vacuum Charging Station
Suitable Canister
or Standard Service Manifold (Refer to Fig. 4)
To eliminate system contaminants from an air
conditioning system requires discharging the entire
system. This means removing all of the refrigerant and
cleansing all contamination (air and moisture) from the
system components. If any of the major system
components are to be repaired or replaced, the
system must also be completely discharged.
WARNING
The vehicle must not be running during this
procedure. Be sure to have adequate
ventilation during this operation. Do not
discharge refrigerant near an open flame.
Numbers and letters in parentheses refer to Fig. 4.
1. Position the vehicle in a level work area, apply the
parking brake and switch off the engine. Turn steering
wheel several times to relieve pressure in the steering
circuit.
2. Block all road wheels and place the battery master
switch in the 'Off' position.
3. Pull on handle to release hood catch and raise the
hood.
4. Connect the service hose (yellow) to the centre
access port on the manifold gauge and to the vacuum
connection (6) on vacuum pump. Ensure that the
system is empty before connecting the vacuum so
that refrigerant does not enter the pump.
5. Tighten down (turn clockwise) both high and low
side valves on the gauge manifold to the closed
position. Remove protective caps from the service
ports on the compressor.
6. Connect both service hoses from the two fittings (2
& 3) in the bottom of the manifold to the two service
ports on the compressor. High side (red) to
compressor discharge valve, low side (blue) to
compressor suction valve.
7. Switch vacuum pump on, open vacuum pressure
valve (1) until less than 6 mb is reached on vacuum
Gauges:
A - Vacuum Gauge
B - Low Pressure Gauge
C - High Pressure Gauge
D - Charging Cylinder
Pressure Gauge
Valves:
1 - Vacuum Pressure
2 - Suction Line
3 - Discharge Line
4 - Refrigerant Gas
5 - Refrigerant Liquid
Port:
Fig. 4 - Standard Service Manifold
BC D
A
VACUUM PUMP
SUC DIS
ACCESS
PORT
23
4
5
6
1
R
E
F
R
I
G
E
R
A
N
T
SM - 2424