Mercedes-Benz W220 air conditioning not cooling
W220 air conditioning is not cooling, what should be checked?
The most common cause is a lack of refrigerant due to a leak; leak points include the condenser, the compressor and the connections. The compressor can also run continuously if the free-wheel clutch or the solenoid is stuck or the charge is low. The pressures must be measured on both sides at a workshop.
How are the W220 air conditioning fault codes read?
The code search starts by pressing the REST button and the activated charcoal filter button on the climate control panel at the same time. The codes appear on the display after a moment and are scrolled with the temperature buttons. A permanent fault returns after resetting.
What do the W220 air conditioning codes B1256, B1228, B1457 and B1464 mean?
B1256 is the front evaporator temperature sensor. B1228 concerns the left temperature sensor, and its fault alone does not usually prevent cold air. B1457 is the left footwell and B1464 the right centre vent flap motor; the cause can be a seized motor or a connector fault.