Engine JAC HFC4DA1-2C. Service manual — part 98
AT
AT
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AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
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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
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.
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 182 -
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
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.
AT
AT
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AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
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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.
AT
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AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 184 -
Is the fault eliminated?
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