The heater system delivers warm air to the passenger compartment
after the engine reaches normal operating temperature. Outside air and air
from the passenger compartment pass through the heater core. Hot
engine coolant heats the air, which travels to the passenger compartment
through ducts and outlets.
The heater control unit allows the operator to operate the heater and
ventilation system. Four levers are provided for control of the following
heater operations:
| - | The temperature lever controls the temperature of the air delivered
to the passenger compartment. |
| - | The lever opens and closes the air mix door, which controls the
amount of air passing through and around the heater core. |
| | The mode lever allows the driver to select from the following choices
of air output: |
| - | The blower speed lever controls a four-speed blower motor and
fan. |
| - | The blower speed lever allows the driver to regulate the amount
of cold or warm air delivered to the passenger compartment. |
| • | The fresh/recirc settings lever |
| - | The fresh/recirc lever controls the air inlet of the blower. |
| - | In the fresh mode, the blower circulates outside air through the
heater system. |
| - | In recirculation mode, the blower circulates inside air through
the heater system. |
| - | Recirculated air heats the passenger compartment faster than fresh
air. |
| - | Use fresh air during normal heating operation in order to prevent
window fogging. |
