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 the damper doors will not function. Also, the blower
motor 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 so the
internal components of the compressor remain lubricated.
The following information is provided to assist in troubleshooting common
operational problems which may occur.
No Heating:
1. Check unit fuses.
2. A/C switch is turned off.
3. Blower switch is turned off.
4. Verify the proper engine coolant level.
5. Verify that the engine is reaching operating tempera-
ture.
6. Verify engine coolant is reaching water valve attached
to unit.
7. Verify operation of water valve to permitting engine
coolant to pass through the water valve and heater core.
8. Check power supply to water valve and grounding.
9. Check wiring.
10. Engine thermostat faulty.
No Cooling:
1. Check system fuses.
2. Check blower motor operation, A/C switch is in A/C or
Max position, temperature control is turned to max
cooling (blue area).
3. Condenser fan is operating.
4. Check power supply to compressor.
5. Check wiring.
6. Coolant valve leaking.
7. Drive belt loose or broken.
Electrical Systems - Chassis
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S I G N A T U R E
9 • 2 5 1
TroubleShooting
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