WD Catalog 2018

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11
Chapter
Typical HVAC Systems and
Components
• Heaters
• AC Units
• Heater-AC Units
• Condensers
• Sleeper Units
Now it’s time to add to your general knowledge about different systems. The
series of photos and schematics that follow show typical heater, air conditioner,
condenser and combo units. Figures 11-1 through 11-7 are also illustrated in
corresponding exploded view drawings. You can see the basic parts and how
they go together.
In most of the figures, the underhood components, plumbing, and wiring
schematics that go with the units illustrated are not shown. Their actual
position varies from one vehicle to another. Your basic mechanical knowledge is
sufficient to locate and service any parts not shown.
GROUND WIRE
WATER IN
WATER OUT
RED (LOW SPEED)
ORANGE (HIGH SPEED)
TO 12 VOLT
POWER SOURCE
HIGH
OFF
LOW
Figure 11-1
An auxiliary, universal
heater. It may be mounted
in various ways.
AUXILIARY HEATER
11-1
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