Why does the BMW 3 Series air conditioning suddenly stop cooling?
2 Answers
There are many reasons why the air conditioning may not cool properly. The most common causes include: No airflow or weak airflow: It is necessary to check whether the air filter is dirty, whether the blower can operate normally, and whether the air conditioning flap motor can switch properly; Lack of Freon in the air conditioning system: The system needs to be checked for leaks, and after confirming the repairs, Freon should be added to the standard range; Dirty radiator or condenser: Engine cooling system failure, leading to excessively high water temperature, such as the cooling fan not working, which results in poor heat dissipation from the radiator and condenser; Air conditioning pressure sensor: Incorrect data from sensors such as the evaporator box sensor, causing the air conditioning system to fail to adjust properly; Damaged air conditioning compressor solenoid valve: Damage to the air conditioning compressor clutch or internal damage to the air conditioning compressor; Faulty air conditioning system wiring or control unit.
My BMW 3 Series' air conditioning suddenly stopped cooling the other day, and I imagine you're quite anxious about it. This is often due to insufficient refrigerant or a leak – poor sealing in BMW's AC system is a common issue. A failed compressor electromagnetic clutch could also cause cooling failure. Electrical faults like blown fuses or poor relay contact are potential causes too – when I checked mine, I found the fan wasn't spinning, which affected heat dissipation. A clogged condenser or blockage by debris can restrict cold airflow. Anyway, AC issues need prompt attention as driving in summer heat can easily cause distraction and accidents. I suggest first checking the engine compartment's fuse box when parked. If you're not familiar with it, visit the dealership for professional diagnostic equipment. Don't forget to clean the AC filter during routine maintenance to prevent many problems.
