Chery Tiggo 5 (T21). Manual — part 328
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A/C insufficient cooling
Leak in system
Refrigerant (insufficient)
Refrigerant (overcharged)
Air in refrigerant
Moisture in refrigerant
-
Condenser (dirty or blocked)
Expansion valve (dirty or blocked)
Evaporator core (dirty or blocked)
A/C high/low pressure line (dirty or
blocked)
Blower speed switch (damaged)
Blower motor (damaged)
Compressor assembly belt (loose)
Too much noise in system
Compressor assembly belt (slip)
Compressor assembly clutch bearing
(worn and excess clearance)
-
Compressor assembly solenoid coil (faulty
or loose joint)
-
Compressor assembly belt (over tightened)
Compressor assembly mounting bolt
(loose)
Cooling fan blade (distorted)
-
Refrigerant oil (too low)
Pressure on low pressure side switches
between normal and vacuum during
operation
Moisture in refrigerant (excessive)
-
Pressure is low on both low and high
pressure sides, cooling performance is
insufficient
A/C system (leaked)
Refrigerant (insufficient)
Pressure is low on both low and high
pressure sides, frost exists on line from
condenser to A/C unit
Condenser (dirty or blocked)
Vacuum occurs on low pressure side, and
pressure on high pressure side is too low,
frost exists on lines on both sides of
condenser or expansion valve
Moisture in refrigerant (excessive)
-
Expansion valve (dirty or blocked)
A/C line (leaked)
Condenser (dirty or blocked)
Pressure is too high on both low and high
pressure sides
Expansion valve (faulty)
-
Refrigerant oil (excessive)
Symptom
Suspected Area
See page
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Diagnosis Procedure
HINT:
Use the following procedures to troubleshoot the A/C system.
Standard voltage: 11 to 14 V
If voltage is below 11 V, recharge or replace the battery before proceeding to next step.
a. Check each actuator and sensor code (
).
Indicator inspection
Sensor inspection
Pressure on low pressure side is normal or
slightly low, and pressure on high pressure
side is too high
Surface of condenser (dirty)
Cooling fan (not operating)
-
Refrigerant (overcharged)
Air in refrigerant
Engine (overheating)
-
Pressure on low pressure side is too high,
and pressure on high pressure side is too
low
Compressor assembly belt (slip)
Compressor assembly (faulty)
Pressure on low pressure side is too low,
and pressure on high pressure side is too
high
A/C high pressure line (blocked)
Expansion valve (faulty)
-
1
Vehicle brought to workshop
2
Check battery voltage
3
Customer problem analysis
4
Check panel diagnosis
Symptom
Suspected Area
See page
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a. On-vehicle inspection
b. Inspection
5
Check and clear DTCs, then read DTCs again
For current DTC, go to step 7
For history DTC, go to step 8
DTC
occurs
No
DTC
6
Overall analysis and troubleshooting
7
Troubleshoot according to Diagnostic Trouble Code (DTC) chart, then go to step 9
8
Troubleshoot according to Problem Symptoms Table, then go to step 9
9
Confirm troubleshooting and perform test
10
End
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A/C System Function
1. Self-checking Operation
a. Turn ignition switch ON.
b. Press the A/C + rear defogger button on A/C control panel for 10 seconds and A/C begins
self-checking. The self-checking takes about 15 seconds, during which the A/C cannot work.
HINT:
If it is unable to determine whether A/C has begun self-checking, turn on the blower before performing
self-checking and push the A/C + rear defogger button. If no air comes out, it indicates A/C is performing
self-checking.
2. Self-diagnosis Function
a. Electrical A/C
Self-diagnosis operation: Press the A/C + outer circulation button for more than 5 seconds.
Malfunction display: Malfunction is indicated by flashing indicator. A/C indicator flash indicates the ten
digit and rear defogger indicator flash indicates the single digit. The interval of flashes for ten digit and
single digit is 0.5 seconds, and the interval of flashes between ten digit and single digit is 2 seconds. If
there are more than one malfunctions, the ten digit and single digit indicators will display (as the first
DTC) again 5 seconds after the single digit indicator turns off. The ten digit and single digit indicators
remain on for 3 seconds at the same time after the single digit indicator goes off for 2 seconds, which
indicates self-diagnosis is completed and it has exited the system (power on or turn on/off A/C
controller can both force the diagnosis function to end). System enters the state before diagnosis after
exiting self-diagnosis mode.
Detail correspondence of codes and malfunction is as follows:
Code
Content
Code
Content
00
No malfunction, system operates
properly
12
Circulation damper motor
malfunction (invalid adjustment)
01
Reserve
13
Mode damper motor malfunction
(invalid adjustment)
02
Reserve
14
Reserve
03
Reserve
15
Reserve
04
Reserve
16
Mix damper motor malfunction
(invalid adjustment)
05
Reserve
17
Reserve
06
Reserve
18
Reserve
07
Reserve
19
Reserve
08
Evaporator temperature sensor
malfunction (short or open)
20
Reserve
09
Reserve
21
Reserve
10
Reserve
22
Communication with BCM
malfunction
11
Blower malfunction (invalid
adjustment)
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