Chery S11 / Chery QQ. Manual - part 79

   Chery QQ Service Manual 

 

 

Fault symptom 

of refrigeration 

system

 

Possible reasons

Fault diagonosis 

Troubleshooting 

action 

Too high pressure at 

the low pressure 

side 

 

Too low pressure at 

the high pressure 

side 

 

Leakage exists in 

the compressor 

Ompression is out of 

condition ↓ 

Air valve leaks air or gets 

out order, 

part slides

 

Repair or replace 

compressor. 

 

 

 

 

Section 11    Check and Maintenance for 

Refrigeration System   

 

1. Condensator 

Check 

（

1）whether the radiator rib of the condensator is blocked. 

155

   Chery QQ Service Manual 

（

2）whether leakage exists at joints of condensator. 

（

3）whether the radiator rib of the condensator is damaged. If the radiator rib    is 

blocked you should wash it with water and    dry it with compressed air. 

Note： 

Be careful not to damage the radiator rib of the condensator. If it becomes curved, a 

screwdriver or joint pliers should be used

.  

If leakage is found in joints or refrigerating pipes the condensator should be repaired 

or replaced. 

2. Receiver drier 

Check： 

Check whether the gas refrigerant leaks with leakage detector. 

Remove 

（

1）When refrigerant is recovered with the recovery and regenerative unit, you 

should follow the instruction of the device. You must measure the lost oil in 

compressor and make-up the same amount of oil. 

（

2）remove the liquid refrigerant pipe. 

（

3）remove the stock solution drier from the bracket

 

Installation 

（

1）when regrigerant is recovered with recovery and regenerative unit , you must 

follow the operating instruction of the device. The lost oil in compressor must be 

measured and make-up the same amount of oil. 

（

2）remove the liquid refrigerant pipe. 

（

3）remove the stock solution drier from the bracket. 

Installation 

（

1）install the stock solution drier in the order contrary to removing . 

Note： 

Supply refrigerant oil of 10cc into the inlet of the compressor when replacing the 

stock solution drier. 

It is not allowed to remove the cap before installing the stock solution drier. 

156

   Chery QQ Service Manual 

（

2）evacuate and charge the system in accordance with the above methods. 

3. Evaporator（thermantidote）

。 

Remove 

（

1）remove the negative wire of the accumulator. 

（

2）prohibit the air bag system function. 

（

3）when regrigerant is recovered with recovery and regenerative unit , you must 

follow the operating instruction of the device. The lost oil in compressor must be 

measured and make-up the same amount of oil. 

（

4）remove the air blower motor and connector of the resistance lead. 

（

5）remove fresh air zipper from the air blower motor. 

（

6）remove the air blower motor after removing the tool kit

 

（

7）remove the lead connector of the thermistor. 

（

8）remove the intaking tube of the compressor,    the outlet pipe the stock solution 

drier and the discharging hose from the evaporator（thermantidote）. 

Note： 

As long as the hoses and metal pipes mentioned above are removd, the joints must be 

pluggedd with caps. 

（

9）remove the evaporator and the its enclosure. 

Disassemble 

（

1）remove the fixing catch and separate the upper box from the lower one of the 

evaporator. 

（

2）remove the upper box and take the evaporator out. 

（

3）remove the following parts from the evaporator. 

expansion valve

△

 

thermist

△

or 

Check 

（

1）whether the radiator rib of the evaporator is blocked. If obstruction occurs, 

radiator rib should be cleaned with compressed air. 

Note： 

It is not allowed to wash the evaporator with water. 

157

   Chery QQ Service Manual 

（

2）check whether cracks or scratches exists at joints of the inlet and outlet. If 

necessary, please repair it. 

 

4. Expansion valve 

Check before removal 

（

1）connect the manifold pressure meter to the service valve. 

（

2）make the engine run in a speed of 1000r/min and turn on the air conditioner. 

（

3）check whether the low pressure meter shows 0.5g（5.0kg/㎝

2

）

. 

If reading is too low（lower than 0.5kg/㎝

2

）

，

the expansion valve and/or stock 

solution drier should be checked. If necessary, please replace it. 

If reading is too high（higher than 0.5kg/㎝

2

）

，

the thermal sensitive bulb bracket 

should be fastened or the expansion valve should be replaced. 

Removal 

See    “remove and disassemble” in the previous section of evaporator (thermantidote) 

for details. 

Installation 

（

1）install the expansion valve in the contrary order of removing it. 

（

2）restore the function of the air bag. 

（

3）evacuate and charge the system in accordance with the above methods. 

5. Thermistor of the evaporator 

Thermistor, a kind of temperature sensors, serves to sense the temperature of air 

discharged from the evaporator. Its electrical characteristics are as follows. 

When the temperature is lower than the specified temperature, the ECU will make the 

electric magnetic clutch disconnect to avoid the evaporator frosting. 

Temperature  ℃ 

Resistance kΩ 

0℃ 

6.65±5% 

25℃ 

2.0+10% 

 

Remove 

158