What Are the Reasons for Slow Air Conditioning Cooling in BMW 5 Series?
1 Answers
The reasons for slow air conditioning cooling in BMW 5 Series may be due to the air conditioning compressor not working. The specific reasons are as follows: 1. Lack of refrigerant in the air conditioning system or the refrigerant pressure switch detecting low pressure or switch failure: Connect to BMW's specialized computer to read the vehicle's fault code: 009C77IHKA indicates a current fault in the coolant compressor. Check if there is a lack of refrigerant and whether the pressure switch data stream is normal. 2. Air conditioning compressor failure: Check if there is a lack of refrigerant and whether the pressure switch data stream is normal. Verify if the signal power supply from the control unit to the compressor, 6.98V, is within the normal range. 3. Air conditioning control unit failure: Check if the signal power supply from the control unit to the compressor, 6.98V, is within the normal range. 4. Air conditioning function switch failure: During the inspection of the resistance of the air conditioning compressor control coil, it was found to be open (standard value range: 10-16Ω). After removing the compressor from the vehicle, the wiring harness was measured to be normal, but the resistance of the control coil remained open. 5. Air conditioning system wiring harness open/short circuit fault.
