The reason why BMW 5 series air conditioner does not cool;
1, lack of refrigerant;
2. The air conditioner damper is damaged;
3. The condenser is too dirty;
4, air conditioning compressor, throttle valve or expansion valve is damaged;
5, belt aging is too loose. The solution is:
1, adding refrigerant from the low pressure side;
2. Release some refrigerant at the maintenance port on the low-voltage side of the air conditioning system;
3. Tighten the air conditioner compressor drive belt;
4. Replace qualified refrigerant and refrigeration oil.
5. Replace the compressor. Remove the installed GPS, turn on the air conditioner, and test that the air conditioner does not cool. First, measure it with fluorine. Under static conditions, it is about 5bar, which is normal. Check the power supply voltage of electromagnetic clutch according to the computer test plan. The result of multimeter measurement is 12V, which is normal. Then let the resistance of the electromagnetic clutch of the compressor be tested, and the test result is infinite. The normal electromagnetic clutch resistance is 2.5- 15 ohm, which is beyond the normal range, indicating that the compressor is damaged. After replacing the new compressor, clean the air conditioning pipeline, and start the air conditioner after adding fluoride again. The compressor clutch is engaged, and the air conditioning refrigeration effect is very good, and the outlet temperature is 2 degrees Celsius.
Fault summary: If the air conditioner does not cool, we should first know whether the cooling effect is not good or not at all, then focus on the inspection according to the fault code, and then use the actual test data according to the test plan to see if it is within the normal range, and finally find the problem.