Chery QQ - Page 446

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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