electrIcal systems - chassIs — 9
182
2 0 0 8 l a Pa l m a X l
Functional Test:
Start and operate the engine until
the water reaches normal operating
temperature.
Set the HVAC temperature control to the
full hot position.
The discharge air outlets should have hot
air.
Rotate the temperature control to full
cold position.
Allow 10 minutes for the temperature to
stabilize.
The discharge air outlets should have
cold air.
System Components
Compressor -
The compressor is
belt driven from the engine through
the compressor and electronic clutch
pulley. The compressor will pump
freon from a low-pressure gas into a
high-pressure, high-temperature gas.
This is the start of the refrigeration
process.
Condenser -
The condenser is made
of coils and fins which provide rapid
transfer of heat from the refrigerant
as external air passes over the coils.
The high-pressure gas is changed to a
high-pressure liquid.
Condenser Fan -
A steady flow of
cooling air is maintained across the
condenser during system operations.
Receiver-Drier -
Freon leaves the
condenser, enters the receiver-drier and
is stored until needed. The drier filters
out moisture in the system. It only
takes one drop of moisture to cause a
malfunction in the cooling unit.
Expansion Valve -
The expansion
valve suppresses the refrigerant into
the evaporator according to the cooling
requirements. The pressure is reduced
in the restrictive effort of the expansion
valve. A part of the valve is the
capillary tube assembly. The capillary
tube is the sensing bulb at the outlet of
the evaporator.
Evaporator -
A tube core and fins are
used in the evaporator similar to the
condenser. Air is blown through the
fins to allow the evaporator to cool and
reduce pressure.
Blower and Motor -
The evaporator
has a fan called the blower. The blower
will draw air from the cab area and
force the air over the evaporator coils
and fins. This forced air will ensure
continuous vaporizing of the R134a.
Relays and Switches -
Both electronic
and vacuum switches are used in the
control and operations of the system.
Vacuum Generator -
The vacuum
generator is important to the operation
of the dash heating and A/C systems.
This provides the vacuum to open
and close the vacuum switches. The
vacuum generator creates 15 inches of
vacuum that is passed to a reservoir
ball. Most dash heater and A/C systems
will only require 10 inches of vacuum
to operate the switches. The output
from the reservoir is sent to the vent
control knob. The control knob will
then direct the vacuum operation to
the appropriate vacuum switch to open
or close vents and switches. When the
ignition is on and the A/C is operating,
the vacuum generator will operate.
030947
Vacuum Generator: Located at front firewall.
Summary of Contents for 2008 LaPalma XL
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Page 47: ...43 2008 LaPalma XL driving safety 2 Weight Record Sheet Actual Worksheet 020255b...
Page 102: ...appliances 4 98 2008 Lapalma xl Notes...
Page 128: ...equipment 5 124 2008 LaPalma xl Notes...
Page 144: ...water systems 6 140 2008 LaPalma xl Notes...
Page 172: ...electrical systems house 8 168 2008 LaPalma xl Notes...
Page 188: ...electrical systems chassis 9 184 2008 LaPalma xl engine no start flow chart...
Page 232: ...INDEX 228 2008 LaPalma xl Notes...
