Saab 900 Service Manual page 58

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CHeating and ventilation system, air conditioning system
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Connect the hose to
th~
vacuum pump and
switch on the heating element for the measuring
cylinder.
Start the vacuum pump and open the ballast
valve.
1 Vacuum pump switch
2 Ballast valve
,
,
Close valve A. Check that valve G is closed.
Switch off the vacuum pump. Rotate the scale on
the measuring cylinder to the same reading as
that on the gauge above. .
Read off the height of the column.
Let the vacuum pump continue to run for about
twenty minutes after the reading on the gauge
has reached -1 bar.
b
(Q)
®
Open valve A. Close the ballast valve after about
one minute.
Saab900