Morgan Olson Amazon P80 2019, Руководство по обслуживанию

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Genuine OEM Parts 1.800.233.4823 www.morganolsonparts.com
TROUBLESHOOTING
SECTION A: AIRFLOW PROBLEMS
PROBLEM A-1
, No air flow, blower does not operate
POSSIBLE CAUSE #1 ~ Faulty Blower Motor
CORRECTIVE ACTION ~ With the ignition turned ON, unplug the 2-pin connector at the blower motor.
Check the orange wire for +12 volts and the white wire for a fully grounded circuit. If power is present
and the circuit is grounded, remove the motor and blower wheel from the blower housing. Inspect for
any evidence of entrapped debris or a broken blower wheel that might have prevented rotation. If no
such evidence is found, bench-test the motor with a 12 volt power supply. If the motor fails to rotate,
replace motor.
POSSIBLE CAUSE #2
~ Blown fuse due to short
in wire harness
CORRECTIVE ACTION ~ Refer to the Heater/
Defroster Wiring Diagram and the Chassis Man-
ufacturer’s wiring information. Trace the entire
Heater/Defroster wiring for an electrical short.
Replace or repair as required.
POSSIBLE CAUSE #3 ~ Defective Blower Switch
CORRECTIVE ACTION ~ Refer to the Blower
Switch Continuity Diagram and check the blow-
er switch for continuity through the switch in all
four switch positions. Replace the blower switch
as required.
PROBLEM A-2
, Blower operates, but
not in all blower switch settings
.
POSSIBLE CAUSE #1 ~ Blower resistor failure
CORRECTIVE ACTION ~ If the blower operates
only on the highest blower speed (blower switch
rotated fully clockwise), the blower resistor has,
most likely, failed. [Hint: The resistor is
bypassed when the highest blower
speed is selected.] Refer to the Blower
Motor Resistor illustration (below); re-
move the three-wire connector from the
resistor. Check for electrical continuity
between terminal 1 and 3. If an open
circuit exists between 1 and 2, the ther-
mal limiter has blown and it will be nec-
essary to replace the resistor. [Note: A
failed resistor is often the result of a
problem with the blower motor. Make
sure that the blower motor is fully opera-
ble and is not bound in sort of way by a
broken blower wheel or entrapped de-
bris within the blower housing.]
POSSIBLE CAUSE #2 ~ High-blower relay failure
CORRECTIVE ACTION
~ If the blower operates in all speed selections except for the highest selection
there is a possibility that the high-blower relay has failed. [Note: The high-blower relay is activated when
the highest blower speed is selected. The relay extends the life of the blower switch and insures the
highest voltage for the motor.] Remove the relay and test for an open circuit across terminals 85 and
86. If the circuit is open, replace the relay.