Chery S11 / Chery QQ. Manual - part 80

   Chery QQ Service Manual 

See “remove and disassemble” in the evaporator section for details. 

Installation 

（

1）install the thermistor in the order contrary to removing it. 

（

2）evacuate and charge the system according to the above described methods. 

 

6. Refrigeration pipe 

Check 

（

1）check whether the hoses and the metal tubes leak air with leakage detector. 

（

2）check whether each hose clamp or metal tube clamp is fastened. If not, please 

fasten them or replace the slack. 

Remove 

（

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）change the faulty hoses or metal tubes. 

Note： 

The above hoses and metal tubes should be covered with caps quickly when they are 

removed to avoid damp and dirt to enter. 

Installation 

（

1）install the refrigeration pipes in the order contrary to removing it. 

（

2）evacuate and charge the system according to the above described methods. 

7. Circuit elements 

1）air conditioner switch 

Check 

（

1）remove the negative wire of the accumulator 

（

2）remove the unit heater slider and the central decoration

 

（

3）Remove the air conditioner switch connector, take down the air conditioner 

switch. 

（

4）check whether terminals’ conduction of the air conditioner switch is correct with 

ohm gauge 

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   Chery QQ Service Manual 

Switch 

1 2 3 4 5 

OFF 

● 

● 

 

● 

 

 

 

 

 

ON X 

● 

 

 

 

 

 

● 

 

● 

                 

If the air conditioner switch does not conduct, please replace it. 

 

2）high-low pressure protection switch 

This car is equiped with the high-low pressure protection switch 

check  

（

1）check whether switches conduct at normal temperature of about 25℃ when the 

air conditioning system is charged with refrigerant properly and the compressor 

works. 

（

2）the switches should not conduct under the following pressures 

Pressure at the high pressure side 

Switch 

Below 196kPa(0.2kg/㎝

2

) 

Over 3140kPa(32kPa/㎝

2

) 

non-conducting 

 

 

 

3）relay for fan 

The relay for air conditioner is located in the box of the fore cabin fuse relay. 

Check 

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   Chery QQ Service Manual 

（

1）remove the negative wire of the accumulator. 

（

2）remove the relay connector and then remove the relay. 

（

3）wiring as shown in the diagram. Check whether the pins ③ and ① are 

conducting. If not, please replace the relay. 

8. 

Compression system

 

Parts of the compressor must be free from dirt and foreign substance when the 

compressor is being maintained. For correct maintenance, the clean tools and work 

spots are the most important. The connections and surface of the compressor should 

be made clean before maintenance or removing the compressor on any car. Parts of 

the compressor should be kept clean at any time. Any resassembled parts must be 

washed with methane trioxide, crude gasoline, kerosene or other equivalent solution 

and then dried in dry air. Only napped cotton fabric can be used for wiping parts. 

Without additional descriptions, removing the compressor from a car and overhauling 

it on the work table should follow the below operations. The parts should be prepared 

in the order of check. The remaining oil in the compressor should be drained out after 

the compressor is removed from a car for maintenance, then the compressor is charge 

with new refrigerant. 

1）fault diagonosis 

Item Troubles 

Possible 

reasons 

Action 

1 

Compressor has noise  Piston, 

bearing, 

cylinder and/or 

crank shaft is out of 

condition 

replace 

2 

Electric magnetic cluch 

has noise 

Working face for 

bearing and/or 

clutch is out of 

condition 

replace 

3 Insufficient 

refrigeration 

Gasket and/or reed 

valve is out of 

replace 

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   Chery QQ Service Manual 

condition 

4 

No 

rotating 

Due to item 1 

locked 

replace 

5 

Oil or air leakage 

Seal  is  out  of 

condition 

replace 

 

Light maintenance can be done onboard and the refrigerant needn’t be discharged, 

while the refrigerant must be discharged in overhaul. 

There are three main types of the compressor faults：air leakage, noise and 

underpressure. In most cases, air leakage always occurs at the shaft seal. Leakage 

detector must be used when leakage is checked. In case of a small amount of 

compressor oil leakage from the shaft seal, it is unnecessary to replace the shaft seal. 

A little bit of oil leakage from the shaft seal is designed to lubricate the system. So 

only when a large amount of oil leakage occurs or air leakage is found with leakage 

detector, you can replace the shaft seal. For noise and underpressure, repair should 

be done after the fault is confirmed.   

2）check compressor 

（

1）install manifold pressure meter;   

（

2）run the engine with rapid idle speed. 

（

3）check the following items for the compressor. 

①

  reading of the high pressure meter is not lower than the normal value and the 

reading of the low    pressure meter is not higher than the normal value. 

②

 metal noise. 

③

  leakage at the shaft seal. 

The compressor should be repaired if any fault above occurs. 

Remove 

（

1）run the engine with idle speed, turn on the air conditioner for about 10 mins. 

（

2）remove the negative wire of the accumulator. 

（

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

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