Saab 900 Service Manual page 57

Heating and ventilation system, air conditioning system 854-45
Connect the cable to the negative pole of the bat-
tery and start the engine.
Use a leak detector to check all connections.
The detection of a leak will be indicated by a
steady bleeping changing to a rapid, higher-fre-
quency bleeping.
Remedy any leaks.
Final charging of the system
Before finally charging the system, all refrige-
rant in the system must be drained and a vacuum
must be raised in the system by the vacuum
pump.
Proceed as follows:
Disconnect the hose from the vacuum pump and
insert the end in an exhaust extraction hose.
I
Open valve A carefully to release a slow flow of
refrigerant (to prevent refrigeration oil being dis-
charged with the refrigerant).
When the reading on the gauge has fallen to '0'
bar, close the valve.
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Saab900