ELECTRICAL SYSTEMS - CHASSIS --- SECTION 9 • 345
NEPTUNE 2004
9
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. Inlet water temperature should be the same as 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 ¼ inch red air line.
Whenever the ignition is ON, and the A/C is operating,
the vacuum generator will operate.
The ABS Diagnostic Plug is
located on the left side of the
steering column. The Engine
Diagnostic Plug is located in the
engine compartment area.
030947
DIAGNOSTIC PLUG LOCATION
Engine
Oil Fill
Engine Oil
Dipstick
Engine
Diagnostic
Plug
Power
Steering
Reservoir &
Filter
ABS Plug .tif
Diagnostic Plug .tif
Содержание Neptune 2004
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