Heater
For heating, fresh air is sucked under the windshield and enters the car interior through the fan. The air passes through the heater body and is distributed between individual nozzles by various flaps. If the heater is set to "heat", the warm air flap opens and cold air passes through the heat exchanger and is heated by hot coolant. The flowing air is heated by the lamellas of the heat exchanger and then enters the car interior. The heater is regulated only by the amount of air flowing through the heat exchanger; the coolant constantly circulates in the heat exchanger. A four-stage fan serves to increase the power of the heater. Pre-resistors are connected to the fan so that it operates at individual stages with different speeds.
The resistors are located on the fan connection board. If faulty, the entire board should be replaced. The fan and heater housing are located in the passenger compartment under the instrument panel.
Special equipment: Air conditioning
With the help of the air conditioning, the interior temperature can be set below the ambient temperature. When the air conditioning is running, the humidity in the interior is also reduced. The air conditioning compressor is driven by the engine via a V-belt, which must be checked and, if necessary, replaced as part of the maintenance, see Section Maintenance technology, tools and workplace equipment. Repair work on the air conditioner must be carried out in a specialized workshop.
Attention! Do not open the air conditioner refrigerant circuit, and do not carry out welding work near it, as there is a risk of injury and health hazard due to the protruding refrigerant.
Cars produced from 9/85 to 9/89.
1 - side defroster nozzle; 2 - side ventilation nozzle; 3 - lower ventilation nozzle; 4 - middle ventilation nozzle; 5 - control unit; 6 - rear heating channel; 7 - Fan unit; 8 - middle defroster nozzle; 9 - heater box
MAZDA 323 since 10/89.
1 - heater box, air distribution housing and heat exchanger
2 - Fan unit fan motor with pre-resistors