 |  | | The heater controls are located well up on the instrument panel to make them easy to see and reach, without distracting the driver's attention from the road. | The rotary heater and ventilation controls provide a simpler, more accurate alternative to slide controls. An added advantage is the ease with which it is possible to 'feel" the precise position selected at any time. |
 | 1. After starting from cold in the winter, the air distribution knob should be set straight up, the temperature knob to maximum at the fan to 3. This provides maximum defrosting action at the windscreen and the side windows. | | 2. After a short time, the distribution knob should be turned one snap setting to the left. The air is then distributed equally onto the windows and towards the floor. | | 3. The next setting provides maximum heat at floor level, A gentle flow of air through the defroster outlets keeps the windows clear. | | 4. Maximum heat at the floor and, if required, a simultaneous supply of cold air through the two fresh air nozzles in the centre of the dashboard. | | 5. Fresh air distribution through the dashboards outlets. One of these is the comfort setting. | | 6. Maximum setting, in which the fan starts automatically and runs at a higher speed than at fan setting 3-regardless of the setting of the fan control knob. | | 7. All vacuum-controlled air dampers are closed and the fan is switched off. |
quired direction, and the air flow can also be varied from zero to maximum by means of a control damper. The heating and ventilation controls are as follows:
- three-position rotary control knob
for choice of fan speeds (the fan always runs at a minimum of quarter speed, unless the air distribution control is set to 0);
- temperature control knob;
- air distribution control with vacuum unit. The knob has seven snap settings arranged in a programmed, logical order to operate vacuum-controlled dampers which distribute warm and cold air in the interior. The fresh air flows through a ventilation air filter to the heat exchanger, where it is heated before being discharged into the interior. The number of air outlets and their locations are of major importance to the occupants' sense of comfort. If the air velocity were higher than 0.3 m/s, the car would feel draughty. The Saab 900 is equipped with vacuum-controlled dampers which distribute warm and cold air through 13 outlets or slots, arranged at strategic points in the interior. In addition, two separate dampers are provided for cold air. The many outlets together ensure a gentle but very effective flow of air through the interior. When the fan is running at maximum speed, 100 litres (3.5 cu ft) of clean, fresh air flow through the interior every second. To ensure the best possible evacuation capacity, Saab engineers have determined the locations of the exhaust air outlets by wind tunnel tests.
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