Electrical Systems - Chassis --- Section 9
The Executive 2005
411
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.
No Heat:
• Check the blower and air mode operations. Repair prior to proceeding.
• Verify the engine is reaching normal operating temperature.
• Check the inlet hose at the water valve. Inlet water temperature should be approximately
equal to the engine coolant temperature.
• With the temp control on full hot position, Confirm that the outlet hose of the water valve
is at engine water temperature.
Vacuum Generator:
The vacuum generator creates vac-
uum to open and close the vacuum
switches. The vacuum generator creates
and stores 15” of vacuum in a reservoir
ball. Output from the reservoir is sent to
the vent control knobs to open or close
vents and switches. The vacuum gener-
ator uses the air from the front air stor-
age tank through a ¼" red air line. The
vacuum generator will operate when-
ever the ignition is ON, and the A/C
is operating.
About Refrigerants
Chemical Stability:
The air conditioning system life and efficient operations depends upon the chemical stability of the
refrigeration system. The refrigeration system is made of Refrigerant-R134a and Polyakylene Gycol
(PAG) synthetic lubricant. It is very important that all materials contained within the refrigerant system
be chemically compatible.
NOTE:
An ultraviolet or UV Blue Light is used for leak detection.
The only suitable compound for use with R134a is PAG. The total amount of PAG within the
refrigerant system is approximately 18% of the total refrigerant in the system.
Vacuum
Generator
Vacuum
Reservoir
Ball
12-Volt DC
090386
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