Monarch SE 2004-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Section 8 Electrical System | 329
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 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 appro-
priate 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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