Saab SONETT III Service Manual page 145

The fan motor is switched on and off by a switch with
trio positions. In addition, the motor up to and incl.
chassis No. 71501200 can be set at the summer position
(high speed) and winter position (low speed) by simple
switching of the connection piece on the wall behind the
windshield washer.
SUMMER - WINTER POSITIONS, FAN MOTOR AND HEAT
EXCHANGER BLEED NIPPLE, UP TO AND NCL. CHASSIS
NO. 71501200
When the road speed exceeds 30 mph. (50 km/h), the
speed wind is usually sufficient to ensure satisfactory
function of the heating system. Consequently, it is only
necessary to use the fan when the car is being driven at
a relatively low speed.
The heat exchanger is fitted with a bleed nipple enabling
it to be bleed whenever the cooling system is refilled.
The passenger compartment is ventilated through two
grilles at the sides of the roof and via channels to outlets
located behind the openable side windows.
VENT CHANNELS
Removal of fan motor
1. Take off the hood. See Chapter 8.
2. Back off and remove the nine self-tapping serews re-
tain ing the heater box cover.
3. Back off and remove the screws for the heat-exchanger
cover and remove the cover.
4. Back off and remove the retaining screw for the fan
casing. Disconnect the cables and note their respec-
tive locations. Lift out the fan.
REMOVAL OF FAN CASING
5. Remove the screws holding the fan motor to the cover
and lift out the motor.
The fan motor and impeller are balanced together in
order to ensure vibrationfree running. An exchange
system is operative in respect of the complete fan unit.
Reinstall in the reverse sequence.
Check the function of the fan before ref itting the cover,
etc. Joints between the fan casing, heater box and cover
must be sealed thoroughly with a suitable sealing com-
pound, e.g. R ibbonseal EC 2185, which is manufactured
by the 3-M Company.
Removal of heat exchanger
1. Take off the hood. See Chapter 8.
2. Drain off the coolant.
3. Back off and remove the nine self-tapping screws re-
taining the heater box cover.
4. Back off and remove the screws for the heat-exchanger
cover and remove the cover.
5. Back off and remove the retaining screw for the fan
casing and tum n the casing aside out of the way.
6. Disconnect the hoses to the heat exchanger.
7. Remove the front panel on the heater box. If necessary,
remove also the container for the windshield washer
liquid.
941-2
SAAB
Nov. 1972