183
2 0 0 8 l a Pa l m a X l
electrIcal systems- chassIs — 9
Troubleshooting
The dash A/C and 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
No Cooling:
1. Check that the blower is operating, A/C
switch is in
A/C
or
MAX A/C
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.
NOTE:
An ultraviolet or UV Blue Light cube
is used for leak detection when dye is
introduced to the A/C System.
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.
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.
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. Is the vacuum generator being powered
and producing a vacuum?
2. Check the vacuum line entering the unit
for vacuum.
3. 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.
4. Check the mode switch.
5. Check wiring.
6. Check for a pinch in the vacuum line
leading to the vacuum motor that
operates the damper door in question.
DIagnoStIc plug locatIon
An engine diagnostic
plug (J1939 and J1587) is
located under the dash on
the left side of the steering
column. There is also a
diagnostic plug (J1939
and J1587) located on top
of the engine attached to a metal bracket.
Engine Diagnostics:
The engine diagnostics will notify the operator
of deviations from the programmed limits of
the engine through the “Warning” lamp in the
dashboard. Should a system component with the
engine develop a deviation, the “Warning” lamp
will illuminate and a diagnostic code will be
logged and stored in the system memory. These
codes are accessed by a service technician using
special equipment.
090280e
Summary of Contents for 2008 LaPalma XL
Page 12: ......
Page 14: ......
Page 16: ......
Page 47: ...43 2008 LaPalma XL driving safety 2 Weight Record Sheet Actual Worksheet 020255b...
Page 102: ...appliances 4 98 2008 Lapalma xl Notes...
Page 128: ...equipment 5 124 2008 LaPalma xl Notes...
Page 144: ...water systems 6 140 2008 LaPalma xl Notes...
Page 172: ...electrical systems house 8 168 2008 LaPalma xl Notes...
Page 188: ...electrical systems chassis 9 184 2008 LaPalma xl engine no start flow chart...
Page 232: ...INDEX 228 2008 LaPalma xl Notes...
