Chery Tiggo 5 (T21). Manual - part 340

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4. Listen to the operation sound of A/C compressor assembly while it is operating at maximum and minimum 

displacement positions.

5. Using an engine sound scope or a long screwdriver with handle, hold the A/C compressor assembly near 

your ear for detecting, in order to locate the noise source easier.

6. To duplicate a high temperature condition (high pressure), air is limited to flow through the A/C condenser. 

Install a manifold pressure gauge set to ensure that the discharge pressure is lower than 2550 kPa. 

7. Check the condition of compressor assembly belt.
8. Check the compressor assembly hub, pulley and bearing assembly. Make sure that the hub and pulley are 

aligned correctly, and the pulley bearing is securely installed to the A/C compressor assembly. 

9. Check if the refrigerant line routes incorrectly, is damaged or has an interference that could result in an 

abnormal noise. Also, check the refrigerant line for twist or bend, otherwise the refrigerant will be limited to 
flow, which will cause a noise. 

10.Loosen all the compressor assembly tightening bolts and retighten them.
11.If noise occurs when the liquid refrigerant in A/C suction pipe is under a slugging condition, replace the 

condenser and check the refrigerant oil level and the charging condition for refrigerant.

12.If the slugging condition still exists after replacing the condenser, replace the A/C compressor assembly.

Refrigerant Leakage Inspection

Check refrigerant for leakage

1. After recharging refrigerant, use the gas leak detector to check the refrigerant gas for leakage.
2. Perform operations under the following conditions:

 Stop the engine.
 Ensure the ventilation is well (the gas leak detector may react to volatile gases which are not from 

refrigerant, such as gasoline vapor or exhaust gas).

 Repeat the test for 2 or 3 times.
 Make sure that there is some refrigerant remaining in the refrigerant system.

WARNING

 DO NOT race engine when vacuum pump operates or vacuum exists in the A/C system. Failure to do so 

may result in a serious damage to the A/C compressor assembly. 

WARNING

 DO NOT perform pressure test or leakage test to R134a service device or vehicle A/C system with 

compressed air. Air mixture and R134a is inflammable at high pressure. These mixtures have potential 
danger, and it may cause a fire or explosion, resulting in vehicle damage, personal injury or death. 

 Avoid inhaling vapor or moisture from the A/C refrigerant and refrigerant oil.
 Only use technical service device to discharge the R134a system. If system is discharged unexpectedly, 

ventilate the work place before servicing. 

CAUTION

 If the A/C refrigerant filling amount is empty or low, the A/C system may have leak. Check all A/C lines, 

joints and parts for remaining oil. The remaining oil is the indication mark of A/C system leaking position. 

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3. Place air leakage tester near the joint of A/C line, and 

check A/C line for leakage. If the air leakage tester 
makes a sound, it indicates that a leakage exists. Repair 
or replace the leaking A/C line as necessary.

4. Disconnect the A/C pressure sensor connector, and use the same procedures to check the A/C pressure 

sensor for leakage. Replace the A/C pressure sensor as necessary. 

5. Insert the air leakage tester into the evaporator tank assembly, and use the same procedures to check the 

evaporator for leakage. Clean or replace the evaporator core assembly as necessary. 

6. Use the same procedures to check the condenser for leakage. Clean or replace the condenser assembly 

as necessary. 

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Refrigerant Recovering/Draining

1. Open the hood, and loosen the joint cover of A/C high/low pressure line.
2. Connect the refrigerant recycling machine to A/C high/low pressure line joint.

a. Connect the red connector to A/C high pressure line 

joint (1).

b. Connect the blue connector to A/C low pressure line 

joint (2).

3. Open the high pressure valve and low pressure valve of refrigerant recycling machine.
4. Choose the "recovering" item on machine and make it start to operate.
5. Check the low pressure value on pressure gauge to ensure that the recycling is completed, and then turn 

the machine off.

6. Disconnect the connections between refrigerant recycling machine and A/C line joint.
7. Reinstall the cover onto the refrigerant line joint.

WARNING

 Take extra care when servicing the A/C system under high pressure.
 Because there is refrigerant under high pressure in the A/C system, it must be serviced by professional 

technician. Otherwise, a wrong service procedure may cause a serious danger or fatal injury. 

 If A/C system is discharged unexpectedly, ventilate the work place before servicing. In a closed work 

place, a large amount of refrigerant is discharged, which may cause oxygen reduction and result in 
smothering, causing a serious or fatal injury. 

ENVIRONMENTAL PROTECTION

 Never drain the refrigerant in A/C system into the atmosphere directly, and avoid environmental 

contamination.

CAUTION

 It is necessary to recover refrigerant with R134a refrigerant special recycling machine.
 DO NOT work near the open flame.
 Always dispose of recovered refrigerant as specified.
 Never charge R-12 to the refrigerant system which is designed to use R134a. These refrigerants are 

incompatible, which could damage the A/C system. 

 DO NOT race engine when vacuum pump operates or vacuum exists in the A/C system. Failure to do so 

may result in serious damage to the A/C compressor assembly. 

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Vacuum Pumping

1. Open the hood, and loosen the joint cover of A/C high/low pressure line.
2. Connect the refrigerant recycling machine to A/C high/low pressure line joint.

a. Connect the red connector to A/C high pressure line 

joint (1).

b. Connect the blue connector to A/C low pressure line 

joint (2).

3. Open the high pressure valve and low pressure valve of refrigerant recycling machine.
4. Choose the "vacuum pumping" item on machine and the time setting is 15 minutes, then choose OK and 

make it start to operate.

5. Wait for 10 minutes after completing the operation, check if there is any change in the A/C system vacuum. 

If there is any change, the A/C system leakage may exist, you should check and repair the A/C system. If 
there is no change, proceed to perform the refrigerant charging procedures.

Refrigerant Recharging

1. Perform vacuum pumping with vacuum pump.
2. Charge refrigerant oil after checking that there is no leakage in A/C system.
3. Perform vacuum pumping for 3 minutes again after charging refrigerant oil, then charge refrigerant.
4. Choose the "charging" item on machine and set the amount of charging to the specified value, then 

choose OK and make it start to operate.

5. Open the suction valve and close the exhaust valve, and then open the charge valve to allow refrigerant to 

flow into the system.

6. When the delivery of refrigerant has stopped, close the charge valve.
7. If the charged refrigerant is not delivered to the specified position, start the engine to operate the A/C 

compressor assembly.

8. Open the charge valve to deliver the remaining refrigerant to A/C system.

9. Perform A/C system pressure test after charging is completed.

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CAUTION

 A small amount of refrigerant oil in the A/C system will be discharged when recovering and draining the 

refrigerant. Be sure to supplement the lost refrigerant oil during recovering when filling the A/C system.

 DO NOT fill excessive refrigerant. Otherwise, it will cause excessive pressure to the compressor 

assembly, resulting in compressor assembly noise and A/C system failure.

 Always perform vacuum pumping before recharging refrigerant.

WARNING

 At this time, do not open the exhaust (high pressure) valve. Failure to do so may result in serious 

personal injury or even death.