BMW is known for excellent engineering, but even the best designed vehicles still need service, and still, at times, experience part failures. Air conditioning is one of those systems which seem most prone to failure. Little, other than cleaning, can be done to maintain the system, the workshop generally consists of repair, rather than maintenance.
This vehicle presented with a loss of refrigerant, the standard evacuation of the A/C was preformed and no gross (large) leaks were detected. Our service protocol is always recharge the air conditioning (A/C) systems with a UV test dye during any A/C service. Since the refrigerant is a gas, it is very near impossible to visually witness the leakage, other than perhaps refrigerant oil staining. The UV dye clearly shows the point of leakage, be it a hose, seal, compressor or other part.
Replacement of the air conditioning (A/C) evaporator core is no easy task on any car, yet alone a vehicle as complex and well engineered as a BMW. Access to the core involves removing the center console, complete dash, steering wheel, airbag, radio, climate control head and basically stripping the car down to the engine firewall. You can see by the photos that this is no easy task. If the diagnosis is done correctly, you’ll see the evaporator core stained with the dye.