JAC HFC4DA1-2C engine. Instruction — part 25
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and
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A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
1.
Air heater performance diagnosis.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “ symptoms ” or
instruction of other diagnosis tables?
Go to Step 2.
—
2
①Start the engine.
②Let the engine idling.
Does the engine temperature reach normal operating temperature?
Go to Step 3.
Go to Step 9.
3
①Let the engine idling.
②Select “FLOOR” mode.
③Set the minimum speed of blower.
④Set the warmest temperature.
⑤Sense the temperature of inlet and outlet hoses at the heater core.
Is the inlet hose of heater warmer than the outlet hose?
Go to Step 7.
Go to Step 4.
4
①Place the temperature gauge at the central air vent.
②Fix the temperature gauge onto the outlet hose at the heater core.
③Set the maximum speed of blower.
④Set the warmest temperature.
⑤Record temperature at the position listed below:
Central air vent on instrument panel.
Outlet hose at the heater core.
⑥Compare the recorded temperatures.
Are these two temperatures nearly the same?
Go to Step 5.
Go to Step 6.
5
①Check the following parts of vehicle for cold air leak and conduct
relevant maintenance:
Front shield plate.
Internal circulation damper.
Air heater, ventilation and A/C system module housing.
②Conduct necessary maintenance.
Is the maintenance finished?
Go to Step 10.
—
6
①Check the operation of temperature damper.
②Conduct necessary maintenance.
Is the maintenance finished?
Go to Step 10.
—
7
①Shut down the engine.
②Backflush the heater core.
③Start the engine.
④Select “FLOOR” mode.
⑤Set the minimum speed of blower.
⑥Set the warmest temperature.
⑦Sense the temperature of inlet and outlet hoses at the heater core.
Is the inlet hose of heater warmer than the outlet hose?
Go to Step 8.
Go to Step 10.
8
Replace the heater core.
Is the maintenance finished?
Go to Step 10.
—
9
Troubleshoot too low engine temperature.
Is the maintenance finished?
Go to Step 10.
—
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10
Run the system to check the maintenance result.
Is the fault detected and eliminated?
System is normal.
Go to Step 2.
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
2.
Insufficient defrosting.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “symptoms” or
instruction of other diagnosis tables?
Go to Step 2.
—
2
①Start the engine.
②Select “DEFROST” mode.
③Set the maximum speed of blower.
Is there sufficient airflow from defroster outlet?
Go to Step 3.
Go to Step 10.
3
Measure the operating temperature of engine.
Does the engine temperature reach normal operating temperature?
Go to Step 4.
Go to Step 8.
4
①Set the minimum speed of blower.
②Set the warmest temperature.
③Sense the temperature of inlet and outlet hoses at the heater core.
Is the inlet hose of heater warmer than the outlet hose?
Go to Step 11.
Go to Step 5.
5
Test the operation of A/C compressor.
Does the A/C compressor run?
Go to Step 7.
Go to Step 6.
6
Replace the A/C compressor.
Is the maintenance finished?
Go to Step 14.
—
7
Conduct A/C system performance test.
Does the operation of A/C system meet the requirements?
Go to Step 9.
Go to Step 12.
8
Troubeshoot too low engine temperature.
Is the maintenance finished?
Go to Step 14.
—
9
Check whether the internal circulation damper operates normally.
Does the internal circulation damper operate normally?
Go to Step 14.
Go to Step 13.
10
Conduct troubleshooting for air outlet.
Is the maintenance finished?
Go to Step 14.
—
11
Conduct troubleshooting for air heater.
Is the maintenance finished?
Go to Step 14.
—
12
Conduct troubleshooting on A/C performance.
Is the maintenance finished?
Go to Step 14.
—
13
Conduct troubleshooting for internal circulation damper.
Is the maintenance finished?
Go to Step 14.
—
14
Run the system to check the maintenance result.
Is the fault detected and eliminated?
System is normal.
Go to Step 2.
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
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Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
3.
Blower motor noise diagnosis.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “symptoms” or
instruction of other diagnosis tables?
Go to Step 2.
—
2
Check if there is any chip at air inlet grille.
Is there any chip?
Go to Step 8.
Go to Step 3.
3
1.Sit in the vehicle.
2.Close doors and windows.
3.Turn the ignition switch to ON position with the engine off.
4.Run the blower motor at every speed and mode to determine the time
and place of noise generating.
Is the noise under operation of blower is obvious?
Go to Step 4.
Go to Step 11.
4
Touch the blower casing to check for vibration when the blower motor
operating at different speed.
Is there any overvibration?
Go to Step 6.
Go to Step 5.
5
Listen to the sound of blower motor at different speed.
Is there any abnormal noise such as squeak or chirp?
Go to Step 9.
Go to Step 11.
6
1. Remove the blower motor.
2. Check the blower motor impeller for any abnormal deposition.
3. Check the blower motor for any abnormal deposition.
Do you find any foreign matter on blower motor or blower motor
impeller?
Go to Step 8.
Go to Step 7.
7
Check blower motor for:
Vane crack.
Looseness of impeller fasteners.
Improper positioning of impeller.
Do you find any abnormality mentioned above?
Go to Step 9.
Go to Step 10.
8
Clear foreign matter.
Is the operation finished?
Go to Step 10.
—
9
Replace blower motor.
Is the maintenance finished?
Go to Step 11.
—
10
Install blower motor.
Is the operation finished?
Go to Step 11.
—
11
Run the system to check the maintenance result.
Is the fault detected and eliminated?
System is normal.
Go to Step 2.
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
4.
Refrigerating system noise diagnosis.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “A/C system
symptoms” or instruction of other diagnosis tables?
Go to Step 2.
—
2
Check accessory drive belt and drive belt tensioner for failure and conduct
troubleshooting when necessary.
Go to Step 3.
—
3
Run the engine to check compressor for any abnormal noise:
Does the noise last for over 30 seconds?
Go to Step 5.
Go to Step 4.
4
Let the engine run for several minutes.
Stop the engine for 1 minute.
Restart the engine.
Is any noise detected by using this procedure?
Go to Step 6.
Generation of liquid
slugging noise is a
common
phenomenon,
which
shall occur when the
system experience a
long time of shutdown
under
high
temperature and the
ambient
temperature
lowers after a whole
night.
5
Check if the refrigerant level in system is too low.
Is the system refrigerant sufficient?
Go to Step 7.
Go to Step 8.
6
Check if the heat expansion valve is stuck at closed or open position.
Is the heat expansion valve is stuck at open position?
Replace expansion
valve.
Go to Step 7.
7
Check if the compressor bolt and/or A/C pipeline scratches body parts.
Is the mounting bolt loosened?
Tighten bolt and/or
rearrange pipeline.
Go to Step 8.
8
①Recover refrigerant and replace compressor.
②Refill the system.
Is the gas pressure within the specified range?
The system inspection is
finished.
Go to Step 1
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A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
5.
A/C system actuator noise diagnosis.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “symptoms” or
instruction of other diagnosis tables?
Go to Step 2.
—
2
①Start the engine.
②Finish the settings below:
Blower motor speed
Air heater, ventilation and A/C system modes
Temperature control setting
③Define the noise types:
Scraping, bang
Tick/click, chirp or creak
Whish/howling
Is the scraping or bang obvious during mode selection or temperature
setting?
Go to Step 6.
Go to Step 3.
3
When the blower motor speed reduces, is there still tick/click 、 chirp,
squeak or scraping but with lower sound?
Go to Step 6.
Go to Step 4.
4
Is whish/howling obvious under every mode but not so under every
temperature setting?
Go to Step 6.
Go to Step 5.
5
Is there obvious whish/howling only under “DEFROST” or “FLOOR”
mode?
Go to Step 6.
Go to Step 6.
6
Remove the instrument panel bracket.
①Check damper for normal operation.
②Check air duct for blockage or foreign matter.
Does any of the above condition occur?
Go to Step 9.
Go to Step 7.
7
Check modes, temperature dampers and seals for warpage or crack.
Is the damper under normal status?
Go to Step 10.
Go to Step 8.
8
Replace relevant dampers and/or seals.
Is the maintenance finished?
Go to Step 10.
—
9
Remove obstruction or foreign matter.
Is the operation finished?
Go to Step 10.
—
10
Install the instrument panel bracket.
Is the operation finished?
Go to Step 11.
—
11
Run the system to check the maintenance result.
Is the fault detected and eliminated?
System is normal.
Go to Step 2.
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
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Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
6.
Odour diagnosis.
Step
Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “symptoms” or
instruction of other diagnosis tables?
Go to Step 2.
—
2
①Sit in the vehicle.
②Close all doors and windows.
③Start the engine.
④Let the engine idling under normal operating temperature.
⑤Set the maximum speed of blower.
⑥Set the coldest temperature.
⑦Run the A/C under every blower speed, mode and temperature to
determine what kind of odour (musty taste, smell of coolant or oil)
occurs.
Go to Step 3.
Go to Step 8.
3
Check air heater, ventilation and A/C system module assembly filter and
air inlet grille for any chip?
Is there any chip?
Go to Step 4.
Go to Step 5.
4
Clear all chip.
Is the operation finished?
Go to Step 15.
—
5
Check if the carpet is moist.
Is the carpet moist?
Go to Step 6.
Go to Step 14.
6
Check the existence of the conditons below:
Leak at front windshield periphery
Drain pipe blockage of air heater, ventilation and A/C system module
Leak at door seal
Is there any leak?
Go to Step 7.
Go to Step 14.
7
Repair leak when necessary.
Is the maintenance finished?
Go to Step 15.
—
8
Does the odour smell like coolant?
Go to Step 9.
Go to Step 12.
9
Check cooling system for any leak.
Is there any leak?
Go to Step 10.
Go to Step 12.
10
Check vehicle inside for coolant leak or check the front windshield for a
layer of film.
Is there any fault?
Go to Step 11.
Go to Step 15.
11
Replace the heater core.
Is the maintenance finished?
Go to Step 15.
—
12
Does the odour smell like engine oil?
Go to Step 13.
Go to Step 15.
13
①Check engine compartment for any leak.
②Repair leak.
Is the maintenance finished?
Go to Step 15.
—
14
Musty taste is probably caused by molds on evaporator and heater core or
inside air heater, ventilation and A/C system module assembly.
Is the operation finished?
Go to Step 15.
—
15
Run the system to check the maintenance result.
System is normal.
Go to Step 2.
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Is the fault detected and eliminated?
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
7.
Diagnosis of failed blower motor operation.
Step
Operation
Yes
No
1
①Turn the ignition switch to ON position with the engine off.
②Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to “Fault 8”.
Go to Step 2.
2
①Turn the ignition switch to OFF position.
②Disconnect the blower motor.
③Set a test lamp between blower motor power voltage circuit and
control circuit.
④Turn the ignition switch to ON position with the engine off.
⑤Turn the blower motor switch to each speed position.
Is the test lamp on under every speed.
Go to Step 9.
Go to Step 3.
3
Test blower motor power voltage circuit for open circuit or excessive
resistance.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 4.
4
Test blower motor circuit for open circuit or excessive resistance.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 5.
5
①Turn the ignition switch to OFF position.
②Connect the blower motor.
③Air heater, ventilation and A/C system control module.
④Turn the ignition switch to ON position with the engine off.
⑤Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 10.
Go to Step 6.
6
Check serial data code or check for any fault.
Is there any fault?
Go to Step 7.
Go to Step 8.
7
Test circuit.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 8.
8
Test blower motor switch control circuit for open circuit or excessive
resistance.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 11.
9
Check blower motor for poor contact.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 12.
10
Check air heater, ventilation and A/C system control module for poor
contact.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 13.
11
Check audio system for poor contact.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 14.
12
Replace blower motor.
Is the replacement finished?
Go to Step 15.
13
Replace air heater, ventilation and A/C system control module.
Is the replacement finished?
Go to Step 15.
14
Replace blower switch.
Is the replacement finished?
Go to Step 15.
15
Run the system to check the maintenance result.
System is normal.
Go to Step 1.
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Is the fault eliminated?
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Diagnosis
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and
and
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Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
8.
Fault diagnosis of blower motor.
Step
Operation
Yes
No
1
①Turn the ignition switch to ON position with the engine off.
②Turn the blower motor switch to each speed position.
If there any speed position failed?
Go to Step 3.
Go to Step 2.
2
Check blower motor fuse for blowout.
Is the fuse blown out?
Replace the fuse with a
new one of the same
rating.
Go to Step 3.
3
Check the power supply of blower motor.
The blower motor won’t run even though there is voltage.
4
①Run the blower under every speed and run once at the integrated radio
control position of blower.
②20 blower speeds should be effective.
Is every blower speed effective?
Go to Step 8.
Go to Step 5.
5
①Plug a 2-pin connector into the back of blower motor.
②Use integrated radio to control blower and run the blower once at each
one of 20 blower speeds.
③Compare the voltage with the illustrated voltage. Please refer to
“1.2.1.2 Sensor Resistance Table” in “Automatic Air Heater,
Ventilation and A/C System” for details.
Does the voltage approach to the illustrated voltage?
Go to Step 8.
Go to Step 6.
6
Connect the fault diagnosis instrument. Conduct combined testing for
switch data. Use fault diagnosis instrument to increase/decrease the soft
key to select from 20 different blower speeds.
Is every speed effective
Conduct integrated radio
control testing for blower
switch function.
Go to Step 7.
7
Replace air heater, ventilation and A/C system control module.
Is the fault detected and eliminated?
Go to Step 8.
8
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
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Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
9.
Diagnosis of poor A/C system refrigeration.
Step
Operation
Yes
No
1
Check the operation of air mixing damper to confirm no blockage or
rupture.
Is air mixing damper blocked or ruptured?
Replace actuator.
Go to Step 2.
2
①Turn the ignition switch to ON position with the engine off.
②Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 3.
Go to “Fault 7”.
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”.
4
①Start the engine.
②Set the mode switch to “TO-Face” mode.
③Set the internal circulation switch to “ON” position.
④Observe the internal circulation damper.
⑤Set the internal circulation switch to “OFF” position.
Does the internal circulation damper transfer from internal circulation to
ventilation?
Go to Step 5.
Go to “Internal Air
Circulation Fault
Diagnosis Help” in
“Automatic Air
Heater, Ventilation
and A/C System”.
5
①Start the engine.
②Use the fault diagnosis instrument to clear all fault codes stored in air
heater, ventilation and A/C system control module.
③Set the left side air temperature switch to coldest position.
④Set the mode switch to “TO-FACE/FEET” position.
⑤Set the blower motor switch to high speed position.
Does the A/C compressor run?
Go to Step 6.
Replace compressor.
6
Conduct A/C system performance test.
Is the fault detected and eliminated?
Go to Step 9.
Go to Step 7.
7
Install a temperature gauge near the interior air temperature sensor.
Is the indicated temperature below 3℃(5°F)?
Go to Step 9.
Go to Step 8.
8
Check air suction pipe for leak or blockage.
Is the fault detected and eliminated?
Go to Step 9.
—
9
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
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Diagnosis
Diagnosis and
and
and
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Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
10. Diagnosis for insufficient warm air.
Step
Operation
Yes
No
1
Check the operation of air mixing damper to confirm no blockage or
rupture.
Is air mixing damper blocked or ruptured?
Replace actuator.
Go to Step 2.
2
Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 3.
Go to “Fault 7”
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”
4
①Start the engine.
②Set the mode switch to “TO-Face” mode.
③Set the internal circulation switch to “ON” position.
④Observe the internal circulation damper.
⑤Set the internal circulation switch to “OFF” position.
Does the internal circulation damper transfer from internal circulation to
ventilation?
Go to Step 5.
Go to “Internal Air
Circulation
Fault
Diagnosis Help” in
“Automatic
Air
Heater,
Ventilation
and A/C System”.
5
Set the temperature switch to “OFF” position.
When heating or defrosting is applied, is it still cold?
Go to Step 6.
Go to Step 9.
6
①Start the engine.
②Shut down the air heater, ventilation and A/C control system.
Does the A/C compressor run?
Replace compressor.
Go to Step 8.
7
Check cooling system for:
Too low coolant level.
Looseness or wear of accessory drive belt.
Leak of radiator hose or heater hose.
Distortion of radiator hose or heater hose.
Lack of radiator cap pressure seal.
Leak of radiator cap.
Is the fault detected and eliminated?
Go to Step 10.
Go to Step 8.
8
①Set the mode switch to “TO-FACE” mode.
②Turn the ignition switch to ON position with the engine off.
③Set the blower motor switch to maximum speed position.
④Cover the sensor air inlet with a piece of paper of 5mm
2
(2 square
inch) to check whether there is any airflow through the interior air
temperature sensor.
Is the paper still at the original position?
Go to Step 10.
Go to Step 9.
9
Check aspirator pipeline for leak or blockage.
Is the fault detected and eliminated?
Go to Step 10.
—
10
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 2.
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system performance
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performance
performance diagnosis
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diagnosis
diagnosis
11. Inadequate air out.
Step
Operation
Yes
No
1
①Start the engine.
②Set the mode switch to “OFF” position.
Does the blower stop operation?
Go to Step 2.
Go to Step2
2
①Set the mode switch to “VENT” position.
②Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 4.
Go to “Fault 7”
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”
4
Check mode damper for any damage or blockage.
Is the mode damper damaged or blocked?
Replace mode damper.
Go to Step 5.
5
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
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Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
12. Fault diagnosis of internal/external circulation.
Step
Operation
Yes
No
1
①Turn the ignition switch to ON position with the engine off.
②Set the blower motor switch to maximum speed position.
③Set the mode switch to “TO-FACE/FEET” position.
④Set the internal circulation switch to “VENTILATION” position.
⑤Set the internal circulation switch to “INTERNAL CIRCULATION”
position.
Do you hear any change in air flow sound when setting the internal
circulation switch to “INTERNAL CIRCULATION” position?
Go to Step 2.
Go to Step 2.
2
①Set the internal circulation switch to “VENTILATION” position.
②Observe the drive shaft of internal circulation actuator.
③Set the internal circulation switch to “INTERNAL CIRCULATION”
position.
Does the drive shaft of internal circulation actuator rotate?
Go to Step 3.
Go to Step 3.
3
①Observe the drive shaft of internal circulation actuator.
②Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.
Does the drive shaft of internal circulation actuator rotate?
Go to Step 11.
Go to Step 4.
4
①Turn the ignition switch to OFF position.
②Disconnect the internal circulation actuator.
③Turn the ignition switch to ON position with the engine off.
④Use a test lamp connected to sound ground to detect the ignition
voltage circuit 3 of internal circulation actuator.
Is the test lamp on?
Go to Step 5.
Go to Step 12.
5
①Set a test lamp between damper control Circuit A and ignition voltage
circuit 3 of internal circulation actuator.
②Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.
Is the test lamp on when this command is executed?
Go to Step 6.
Go to Step 7.
6
①Set a test lamp between damper control circuit B and ignition voltage
circuit 3 of internal circulation actuator.
②Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.
Is the test lamp on when this command is executed?
Go to Step 9.
Go to Step 8.
7
Check the internal circulation actuator control Circuit A for open circuit,
excessive resistance, short circuit to ground or voltage.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 11.
8
Check the internal circulation actuator control Circuit B for open circuit,
excessive resistance, and short circuit to ground or voltage.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 11.
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AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 190 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
13. Fault diagnosis of internal/external circulation.
Step
Operation
Yes
No
9
Check internal circulation damper and internal circulation actuator for:
Dislocation of circulation actuator.
Linkage fractured or stuck.
Internal circulation damper fractured or stuck.
Obstacle blocking the internal circulation damper moving within the
whole range.
Lack of internal circulation damper seals.
Dislocation of internal circulation damper seals.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 10.
10
Check the harness connector of internal circulation actuator for poor
contact.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 13.
11
Check the harness connector of air heater, ventilation and A/C system
control module for poor contact.
Is the fault detected and eliminated?
Go to Step 15.
Go to Step 14.
12
Repair the ignition voltage circuit of internal circulation actuator.
Is the repair finished?
Go to Step 15.
—
13
Replace the internal circulation actuator.
Is the replacement finished?
Go to Step 15.
—
14
Replace air heater, ventilation and A/C system control module.
Is the replacement finished?
Go to Step 15.
—
15
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 2.
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AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 191 -
Removal/Installation
Removal/Installation
Removal/Installation
Removal/Installation
Removal
Removal
Removal
Removal of
of
of
of front
front
front
front A/C
A/C
A/C
A/C assembly
assembly
assembly
assembly
1.
Recover refrigerant.
2.
Disconnect negative cable of battery.
3.
Remove instrument panel.
4.
Remove mounting bolts from expansion valve.
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