Whole story: 2005 BMW X5 e53 3.0i after a drive sometimes trigger the aux fan front of the radiator to turn on w/o ignition key till the battery is drained. In my desire to localize, I pull up Fuse F14 5A Multifunction control module 1 but it triggers a continuous sound and stop when I plug the fuse back. Climate Control Unit Not Working. So I had just replaced my alternator, and bled the system and everything. Last night my heater was working fine. Then this morning I went to turn on my heat, and nothing was showing. The display won't even turn on nothing is working. I checked the fuses and they seemed fine, not sure if I was checking the right Aux fan is activated by a pressure switch on the low pressure side if the AC system. My fan began running slow when the system needed to be topped off. Once the low pressure reading was over 40psi on a 90 deg F day the fan sounded like an F4 Fantom at takeoff . The most common causes that hinders normal operation of air conditioning system on your BMW 750i are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. 1. Dirty cabin air filter. this video will show you how to fix your air con for less then £5 pound on any bmw and what to check please check out my good buddy nathans channel for all b 5. Replace the relays and redo the temp switch tests. The fan should come on in normal and high speeds. If high speed does not come on: With the aux fan high temp (green/black to black/brown) switch jumped, check for voltage on both sides of fuse 18. If you have no voltage, the K6 relay is suspect. TOP 5 REASONS WHY AC NOT WORKING ON BMW, BMW AIR CONDITIONER DOES NOT WORKIf you have BMW and your A/C AC is not working and you want to know the top 5 reaso Not so obvious parts are the engine water pump (See Photo 3), engine thermostat, fan speed control or, as BMW calls it, “final stage” and the on-board diagnostics system. They all contribute information to allow the processor to regulate heat or A/C operation to control temperature throughout the car’s interior. The most common causes for AC fan blower motor not working in BMW X5 are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working. 1. Blown fuse. Xf5CHD.

bmw ac fan not working