Electrical Systems - Chassis --- Section 9
The Executive 2005
415
Reduced Cooling:
1. Coolant valve not operating correctly.
2. Air passages are obstructed.
3. Loose or worn drive belt.
4. Check blower and select switch.
5. Thermostat control valve is faulty.
6. Expansion valve is faulty.
7. Compressor is 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 to ensure ignition switch is “ON.”
5. Check blower and select switch.
6. Motor shaft has seized.
7. Blower wheel is out of alignment.
Damper Doors Do Not Operate:
1. Does the motorhome air tank have pressure?
2. Is the vacuum generator being powered and producing a vacuum?
3. Check the vacuum line entering the unit for vacuum.
4. Check that the vacuum solenoid mounted on unit is receiving power from the mode switch.
If operating properly, the vacuum solenoid will feel hot if current is engaging the solenoid.
5. Check the mode switch.
6. Check wiring.
7. Check for a pinch in the vacuum line leading to the vacuum motor that operates the
damper door in question.
SYSTEM CONTROL CENTER
Located behind the overhead access panel of a bay compartment is the System Control Center
panel, consisting of the following components.
• Engine Vehicle Interface Relays & Transmission Electronic Control Unit (ECU):
Electronically monitor and control engine and transmission functions and operating condi-
tions.
• Anti-lock Brake Control Module (ABS):
The ABS control modules monitor road speed of each wheel, braking conditions, and front
and drive axle ABS functions. The Tag Axle ABS module is located above the transmis-
sion tail shaft housing. The ATC (Automatic Traction Control) system is also part of the ABS
system.
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