Engine JAC HFC4DA1-2C. Service manual — part 95
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 169 -
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 testing
testing
testing
testing
1.
Test the vehicle under direct sunlight.
2.
Don’t test the vehicle under airflow obstruction of
condenser, such as the vehicle is parked closely
against wall.
3.
Set the blower motor to the highest speed mode.
4.
External air circulation mode.
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 170 -
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 testing
testing
testing
testing
5.
Set the cooling temperature to the coldest status.
6.
Open the instrument panel air vent facing right
ahead. Insert the temperature gauge into the panel
air vent center in thickness of 50mm.
7.
Test under idling status.
8.
Both front windows are closed.
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 171 -
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 testing
testing
testing
testing
9.
The engine hood is closed.
10. Connect the precision pressure gauge to A/C
system.
11. As for the precise testing of humidity (relative
humidity %), the pressure and temperature of air
supply outlet shall vary with humidity (relative
humidity
%).
Please
refer
to
“A/C
System
Performance Table” in this section for details.
12. Shut down the engine. Compare the readings with
data listed in “A/C System Performance Table” and
no big difference can be found under normal
operation of A/C system.
The best status
Normal
In need of maintenance
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 172 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
R
R
R
Refrigerant
efrigerant
efrigerant
efrigerant recovery
recovery
recovery
recovery
1.
Park the vehicle in well-ventilated areas.
2.
Connect to the refrigerant recovery machine.
3.
Turn on the refrigerant recovery machine and select
the refrigerant reclaimer on the control panel.
4.
Open the manual valves at both high-pressure and
low-pressure sides.
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