Saab 900 Service Manual page 56

854-44 Heating and ventilation system, air conditioning system
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To check that the system is tightly sea-
led
Close valve A (isolating the circuit from the vac-
uum pump). The pressure should not rise by
more than
5
mbar over a period of five minutes.
Remedy any leaks. Run the pump to raise the
vacuum again.
Check the vacuum by opening valve G.
Note the reading on the vacuum gauge. The
reading should be below 5 mbar.
To test for leaks in the system
Close valve G (the gauge must not be subjected
to excessive pressure).
Check that valve A is closed.
Stop the vacuum pump.
Read the refrigerant level on the sight glass and
adjust the sight glass.
Open valve
F
and carefully charge the system
with
200 grammes of refrigerant.
Shut valve F.
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Saab900