Saab 900 Service Manual page 102

854-90 Heating and ventilation system, air conditioning system
Fuel-injection engines up to and includ-
ing the 1983 models
The device consists of a solenoid valve which
boosts the supply of air to the inlet manifold.
When the compressor cuts in, the specially calib-
rated valve opens to maintain a correct idling
speed. The valve
is
not adjustable.
Fuel Injection engines as from the 1984
models
(not applicable to the Turbo 16 for the U.S.A.)
The solenoid valve has been moved to the other
side of the make-up air valve. When the valve is
actuated, it is subjected to the higher pressure
prevailing upstream of the butterfly valve, and
will then open more easily.
Saab900
,!