Mazda Training manual - part 272

Air Conditioning Fundamentals

TC070-05-01S

9  – AIR DISCHARGE 
MANAGEMENT 

 

62

OBJECTIVES 
 
After completing this section, you will be able to describe how the following components 
direct airflow through the heating and A/C system: 
 
• 

Fresh/re-circulated air door 

 
• Blower 

fan 

 
• 

Temperature blend door 

 
• Defroster 

door 

 
• 

Vent/face and heater doors 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Air Conditioning Fundamentals

TC070-05-01S

9  – AIR DISCHARGE 
MANAGEMENT 

 

63

 
 
 
 
 
 
 

 
FIGURE 31. The 
Mazda climate 
control system 
allows the operator 
to select heating or 
cooling, with the 
conditioned air 
directed to various 
vents on the 
dashboard.

 

 

AIR FLOW MANAGEMENT COMPONENTS 
 
The climate control system in Mazda vehicles provides conditioned air 
at the desired temperature. It is a combined heating and air conditioning 
unit. The operator can select heating or cooling and direct the air to 
specific vents on the dashboard. Figure 31 shows the location of these 
vents in a typical vehicle.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The heating and A/C system provides a desired comfort zone in the 
passenger compartment by controlling temperature and humidity. This 
comfort zone is subjective, varying from person to person. In addition, 
as weather conditions change, the system must allow changes in 
temperature and airflow direction. 
 

Front heat   

Front heat 

Rear heat   

Rear heat 

Side vent 

Center Vent

Defroster Defroster 

Side demister                                                                                                  Side demister

Side vent

Air Conditioning Fundamentals

TC070-05-01S

9  – AIR DISCHARGE 
MANAGEMENT 

 

64

To allow this flexibility, the system includes the following airflow 
management components: 

 

• 

Fresh/re-circulated air door 

 

• Blower 

fan 

 

• 

Temperature blend door 

 

• Defroster 

door 

 

• 

Vent/face and heat doors 

 

 

The following topics describe the operation of these components. 

 

 

 

Fresh/Re-circulated Air Door 

 

 

Air first enters the system through the fresh/re-circulated air door, as 
shown in Figure 32. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

FIGURE 32. The 
fresh/re- circulated 
air door allows 
either outside air or 
re-circulated air 
from the vehicle 
interior into the 
heating and A/C 
system. 

 

Heater  

Evaporator

Door

Recirculated air

Fresh air

 

Air Conditioning Fundamentals

TC070-05-01S

9  – AIR DISCHARGE 
MANAGEMENT 

 

65

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FIGURE 33. The 

blower fan draws air 

through the fresh/re- 

circulated air door for 

cooling and/or 

heating. 

 

If the operator selects the fresh air option, the system draws outside air 
into the unit either by the force of the forward motion of the vehicle or 
with the assistance of a fan. During normal operation, the fresh air 
option provides the best results. 

 

The re-circulated air option closes off the outside air passage and 
re-circulates cool, dehumidified air from the passenger cabin. This 
option provides maximum cooling. 
 
 
Blower Fan 

 

The blower fan, highlighted in Figure 33, draws air in through the fresh/ 
re- circulated air door. Depending on the system settings, the blower 
draws air through the evaporator (for cooling), the heater unit, or a 
combination of both. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Heater    Evaporator

Blower fan