Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

Heating And Air Conditioning Controls
PART 4: CONTROLS AND DISPLAYS
Air Conditioning System
Your vehicle may be equipped with either of two air conditioning
systems. Cab interior air is continuously recirculated
and cooled by these systems. In both systems, the
compressor, receiver-dryer, and condenser are located in
the engine compartment. (Note: In some applications, the
condenser may be mounted on the cab roof.)
Dash-mounted System
In one system, the evaporator and blower are located inside
the heater unit, under the passenger dashboard. Controls
for this system are located in a modified heater control
head.
02981A
To cool the cab, turn on the air conditioning system, then
adjust the air temperature and blower speed until comfortable.
The amount of cooling is controlled by
• the temperature of the evaporator core
• the speed of the blower that forces air through the core
andintothecab
• the amount of heat added to the recirculated cab air
by the air temperature control
Ceiling-mounted System
In another system, the evaporator and blower are located
in a ceiling-mounted unit. This system’s control panel is
– 40 – Y53-6015 R(08/07)