20 - 5
Air Conditioning
- Refrigerant Charging and Discharging
Note: The procedures for refrigerant charging and
discharging must only be carried out by qualified service
personel who have received specialist training on the air
conditioning system.
!
WARNING
The air conditioning system is a closed loop system and
contains pressurised refrigerant. No part of the system
should be disconnected until the system has been
discharged by a refrigeration engineer or a suitable
trained person. You can be severely frostbitten or injured
by escaping refrigerant.
4-3-4-1/2
Relubricating
Pre-lubrication is essential after recovering system
refrigerant, vacuuming and component flushing.
The system should be evacuated to a vacuum of 740mm (29
in) of mercury before re-lubricating.
1 Ensure that the engine is OFF and the starter key is
removed.
2 Close all valves and connect the manifold as shown,
with the blue hose connected to the oil injector and the
red hose to the system high pressure port.
3 Connect the yellow hose to the vacuum pump.
4 Connect the other end of the oil injector to the system
low pressure point.
5 Switch on the vacuum pump and open the high
pressure side valve.
6 Unscrew the oil injector cap and add the specified
quantity of refrigerant oil.
7 When 740mm (29 in) mercury shows on the vacuum
gauge, open the oil injector valve to allow the oil into
the system.
8 If more oil is needed repeat the above procedure. The
quantity of oil should be the same as that taken out
during the ‘Recovery’ procedure.
Notes:
Use only PAG oil in R-134a systems.
Section B Body & Framework
9803/3280
Section B
20 - 5
Issue 1
Service Procedures
acuum is obtained.
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