Holiday Navigator 2003 Owner's Manual page 377

No Heat:
• Check the blower and air mode operations. Repair prior to proceeding.
• Verify the engine is reaching normal operating temperature.
(Check with engine manufacturer for proper procedure.)
• Check the inlet hose at the water valve. The hose has hot water at
the valve inlet. The inlet water temperature should be the same as
the engine water temp.
• With the temp control on full hot position, check the outlet hose of
the water valve. The hose should be at engine water temperature.
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.
When the vacuum generator is operating it creates 15 inches of vacuum and 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.
The vacuum generator uses the air from the front air storage tank through a 1/4
inch red air line. Whenever the ignition is ON, and the A/C is operating, the
vacuum generator will operate.
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Vacuum
Generator
N A V I G A T O R 2 0 0 3
Storage
Tank
090386
Electrical Systems - Chassis
9 • 3 7 7