Saab 900 Service Manual page 53

Heating and ventilation system, air conditioning system 854-41
If
the measuring cylinder is not com-
pletely empty
Check that all the valves are closed and that the
refrigerant cylinder is connected to the measur-
ing cylinder.
Open the valve on the refrigerant cylinder and
. inlet valve E on the measuring cylinder.
The charging process can be speeded up by
heating the refrigerant cylinder with warm air or
the like.
Warning
Open flames must never be brought in the
vicinity of the refrigerant cylinder. The
electric heater on the measuring cylinder
must be switched off throughout the
charging process.
Do not fill above the mark - maximum charge
2250 g.
Close all valves after charging.
When changing the refrigerant cylinder:
Purge the air from the hose between the refriger-
ant cylinder and the measuring cylinder.
Draining the refrigerant
Before starti ng any work, read through the safety
precautions carefully. When components are to
be changed or if the refrigerant circuit must be
broken for any reason, the refrigerant must be
drained by means of the gauge set on the filling
station. Check that the gauge valves are closed
before connecting hoses.
Conne.ctors must only be screwed finger tight.
Disconnect the negative (-) lead from the bat-
tery.
Connect the red hose to the high-pressure side
of the compressor, marked Dis.
Connect the blue hose to the low-pressure side
of the compressor, marked Suc.
Connections for draining the system
I
·~
OJ
~.
Saab 900