Holiday Navigator 2003 Owner's Manual page 371

Trouble Shooting:
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 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 is leaking.
7. Drive belt is loose or broken.
8. Compressor Clutch is inoperative, will not engage.
9. Expansion Valve is faulty or frozen.
10. Thermostat control is faulty.
11. Mode control switch is faulty.
12. Compressor is faulty.
13. Loss of refrigerant.
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Electrical Systems - Chassis
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