Electrical Systems - Chassis
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
9•241
TroubleShooting:
The dash A/C/Heat system uses a combination of compressed air
(developed by the chassis system), vacuum air (developed by the vacuum
generator) and electric relays and vacuum switches. Therefore, any repair can
be classified in one of five categories.
• Electrical • Vacuum • Air Conditioner • Heater • Defroster
The motorhome compressed air tank must have adequate pressure to
operate the vacuum generator or damper doors will not function. Also, the dash
A/C/Heat unit must be switched ON to provide electric current to the relays,
vacuum switches, etc. The dash A/C and heater system should be used monthly
to keep the compressor lubricated.
The following information is provided to assist in troubleshooting
common operational problems which may occur.
No Heating:
1. A/C switch is turned off.
2. Blower switch is turned off.
3. Verify the proper engine coolant level.
4. Verify that the engine is reaching operating temperature.
5. Verify engine coolant is reaching water valve attached to unit.
6. Verify operation of water valve to permit engine coolant to pass through
valve to heater core.
7. Check unit fuses.
8. Check power supply to water valve and grounding.
9. Check wiring.
10. Engine thermostat faulty.
No Cooling:
1. Check blower is operating, A/C switch is in A/C or Max position,
temperature control is turned to max cooling (blue area).
2. System fuses are not blown.
3. Condenser fan is operating.
4. Check power supply to unit and grounding of system.
5. Check wiring.
6. Coolant valve leaking.
7. Drive belt loose or broken.
8. Compressor Clutch inoperative, will not engage.
9. Expansion Valve faulty or frozen.
10. Thermostat control faulty.
11. Mode control switch faulty.
12. Compressor faulty.
13. Loss of refrigerant.
WINDSOR
To Next Page
Loading...
Need help?
General