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A Typical Cold Weather Example:
Your vehicle has been parked outside ~ v e r ~ ~ i g h t
in
cold weather (below 32 OF/ 0" C) and you have set
the driver temperature at 73 O F (23 "C) and have selected
the AUTO mode. The system will automatically adjust
the temperature output to maximum heating. The fan
will start at a low speed. This is to avoid blowing cold
air into the vehicle. The length of the delay depends
on the amount of time since the engine was last started,
the outside temperature and the engine coolant
temperature. As the coolant warms up, the fan speed
will gradually increase. Air will flow to the floor with
some air to the windshield to prevent fogging under
most normal conditions.
As the interior of the vehicle warms up to your comfort
set temperature, the fan speed will decrease and the
temperature output may become cooler. If the interior
temperature continues to warm up due to heating from
the sun or outside temperature increases, the system
may switch to other air delivery modes (typically
DEFOG or BI-LEVEL).
A vpical Hot Weather Example:
Your
vehicle has Seen parked outside all day in hot
weather (above 70
O F /
2 1
O
C) and you have set the
driver temperature at 73 "F (23
O
C ) and have selected
the AUTO mode. The system will automatically adjust
the temperature output to maximum cooling. The blower
will start at a low speed momentarily to push the hot
air to the floor of the vehicle and then go to a higher
blower speed with cold airflow out of the instrument
panel outlets. A small amount of airflow will continue
through the lower ducts to cool the floor area.
The air intake may start in the recirculated mode for
maximum cooling performance. As the interior of the
vehicle cools down to your comfort set temperature,
the fan speed will decrease and the temperature output
may become warmer. The air intake may shift from
recirculation to fresh air mode. If the interior continues
to cool due to a decrease in the amount of heat the
vehicle is absorbing from the sun or a decrease in the
outside temperature, the system could switch to other air
delivery modes (typically BI-LEVEL or DEFOG).
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