Saab 900 Service Manual page 31

Heating and ventilation system, air conditioning
sys~em
854-19
1
Caution
S 8242
The compressor is provided with an oil fil-
ler plug which may only be removed once
the system has been drained of refriger-
ant.
Note. This is not an oil level plug
Saab900
1 Magnetic clutch
2 Bearing
3 Oil filler plug
4 Service valve
5 Cylinder head
6 Valve housing
7 Piston
6
7
(Sankyo-Sanden)
compressor
The compressor is a five-cylinder, axial-flow
type. The valve system consists of a separate
valve housing located between the compressor
housing and the cylinder head. The valves open
and close as a result of the pressure differences
caused by the reciprocating movement of the
pistons. The service valves for the system are
also located in the compressor cylinder head.
1983 models onwards incorporate a pressure
switch in the service valve for the high- pressure
side. The pressure switch starts and stops the
standard radiator fan when preset pressures are
reached in the system. The pressure switch must
be removed before the pressure gauge equip-
ment can be connected to the service valve on
the high-pressure side.
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