Operating Tips And Hints; Trouble Shooting; No Heating - Monaco DIPLOMAT 2004 Owner's Manual

Operating Tips and Hints:

• Air intake and discharge temperatures are greatly effected by
ambient temperature and relative humidity.
• A large amount of cooling capacity is used to dehumidify air as
well as cool it. After three to five minutes of A/C compressor
operation, the discharged air temperature should be approximate-
ly 30º F cooler than the fresh or recirculated air entering the A/C
system.
• The air system on the motorhome must have adequate pressure
to operate the vacuum generator or damper doors will not func-
tion.
• At the beginning of the day, activate the compressor with the
engine at idle. This will avoid sudden high speed activation
resulting in damage from lack of internal compressor lubrication.
• The dash A/C and heater system should be used monthly to keep
the compressor lubricated.

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.
ELECTRICAL SYSTEMS - CHASSIS
DIPLOMAT 2004
9 • 343