Electrical Systems - Chassis
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9•242
Reduced cooling:
1. Coolant valve not operating correctly.
2. Air passages obstructed.
3. Loose or worn drive belt.
4. Check blower and select switch.
5. Thermostat control valve faulty.
6. Expansion valve faulty.
7. Compressor faulty.
8. Low refrigerant charge.
Blower Does Not Operate or Runs Slow:
1. Check fuses.
2. Check for loose or corroded connection.
3. Check wiring.
4. Check ignition switch is “ON”.
5. Check blower and select switch.
6. Motor shaft seized.
7. Blower wheel out of alignment.
Damper Doors Do Not Operate:
1. Does motorhome air tank have pressure?
2. Check vacuum generator is being powered and producing vacuum.
3. Check vacuum line entering unit for vacuum.
4. Check that the vacuum solenoid mounted on unit are receiving power
from the mode switch. If operating properly, the vacuum solenoid will
feel hot if current is engaging the solenoid.
5. Check mode switch.
6. Check wiring.
7. Check for pinched vacuum line leading to the vacuum motor operating
the damper door in question.
Cummins and Allison diagnostic
plugs are located in the roadside
electrical bay just in front of the
front wheel.
DIAGNOSTIC PLUG
LOCATION
WINDSOR
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