Heater
For heating, fresh air is sucked under the windshield and through the fan enters the car interior. In this case, the air passes through the heater body and is distributed by various flaps between the individual nozzles. If the heater is installed "warm", the warm air damper opens and cold air flows through the heat exchanger and is heated by the hot coolant. The flowing air is heated by the heat exchanger fins 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 is used to increase the power of the heater. Pre-resistors are connected to the fan so that it can operate at different speeds at different stages.
The resistors are located on the fan connection board. In the event of a malfunction, the entire board must be replaced. The fan and the heater housing are located in the passenger compartment under the instrument panel.
Special equipment: Air conditioning
With the help of the air conditioner, the temperature in the passenger compartment can be set below the ambient temperature. The operation of the air conditioner also reduces the humidity in the cabin. The A/C compressor is driven by the engine via a V-belt, which must be checked and replaced as part of maintenance, if necessary, see Section Service technology, tools and equipment of the workplace. Repair work on the air conditioner must be carried out by a specialist workshop.
Attention! Do not open the refrigerant circuit of the air conditioner, and do not carry out welding work near it, as there is a risk of injury and health hazard due to escaping refrigerant.
Cars from 9/85 to 9/89
1 - side nozzle of the defroster; 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