Morgan Olson Amazon P80 2019, Service Manual

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Genuine OEM Parts 1.800.233.4823 www.morganolsonparts.com
SERVICING AND TROUBLESHOOTING
HEATER/DEFROSTER
CONTROL PANEL OPERATION
BLOWER CONTROL
The
Blower Control provides three
blower speeds and OFF. Rotat-
ing the blower knob clockwise
increases the blower speed.
Returning the blower knob to Off
will turn-off the blower motor, but
will not, necessarily, turn off all
air flow; a trace amount of air
movement is possible at highway
speed with the blower turned off.
TEMPERATURE CONTROL
The Temperature Control knob
provides the driver with full temperature control in all of the operating modes. Rotating the knob clock-
wise increases air temperature. Temperature control is achieved by controlling the flow of hot engine
coolant through the heater system. An electrically positioned water control valve regulates the flow of
coolant in proportion to the Temperature Control knob setting. Engine coolant flow is shut-off when the
knob is rotated fully counter-clockwise.
MODE SELECTION
Rotating the Mode Selection knob fully counter-clockwise will direct air to the driver’s face and feet.
With the knob rotated fully clockwise, air is directed to the windshield with a small amount directed to the
floorboard. Placing the knob in a mid-position will provide air flow, concurrently, to the face, feet and
windshield.
AIR SOURCE
Air, in all operating modes, is drawn from two sources in a pre-determined mixture.
The two sources are: A) Outside air which enters the vehicle through a grille on the right side of the vehi-
cle, B) Re-circulated air that enters through the visible grille molded into the top of the heater/blower
housing. An internal door remains closed when the blower is turned off: this prevents outside air from
bypassing the heater coil and entering the cabin when the vehicle is driven without the blower turned on.
SERVICING AND MAINTENANCE
The Heater/Defroster System requires only the customary visual inspections afforded any other heater/
defroster. The engine coolant connections and the temperature control water valve are all visible under
the hood and should be inspected for leakage. Inside the cabin, the re-circulated air inlet must remain
unobstructed.
TROUBLESHOOTING
The following pages contain:
 Wiring Diagram
 Troubleshooting information bro-
ken into two categories – Section A
for air-flow problems and Section B
for temperature control problems
 Illustrated Parts Breakdown for the
Control Panel, Plenum and Heater
BLOWER TEMPERATURE MODE
CONTROL CONTROL SELECTION