4 if everything passes, the DME signals "OK to start A/C" back to the HVAC & simultaneously increases idle speed a bit anticipating the A/C compressor load. 5 the HVAC panel powers the compressor clutch. 6 the compressor engages & cold air starts. In my case, the inop aux fan caused a failure at step 3. Cosmos Black/Black 1995 540iA M-Sport. BMW Individual Exclusive Edition, 1 of 65 total, 9/25/95 Build. OEM additions include Euro trim, passenger seat mounted first aid kit, tool kit warning triangle, clears all around, black chrome exhaust tips, spare tire well gas can, and rear armrest fridge. Waiting for install is an adjustable lumbar Normally on older BMW's this is the "final stage resistor". In German they just call it a switch though. I know on my e36 and e39 this switch is like $140. When it fails the blow motor wil work sometimes and other times the display will show a the fan working but you won't have any output of the fan/air. And the heater goes all crazy too. Air Conditioning Stopped Working - No codes or alerts. 2011 X5 50i. Hello, Just recently, with no trauma or specific event, the AC stopped working. Started car one morning and not working. Seems to be cold on fresh start in morning but quickly the air blowing is not conditioned at all. Blower is working along with all vent settings and 2003 Bmw E46 Air con Cooling Fan Fault Fixed. A broken wire on the air con cooling fan control unit stopping the air con system from working but allowing t SummitChuter Discussion starter. 8 posts · Joined 2012. #1 · Nov 5, 2012. My blower is not working at all. Not on AC or Heater. Not on any level 1-4. I replace the FSU and blower motor. Fuses labeled anything close were checked. P3CK. iTrader: ( 0) HVAC blower intermittently does not work. Solution: wiring is faulty. Having owned the car for two years, it seems like about once a year, the HVAC blower would randomly (near the beginning of the hot season) just not work. The panel would change status but the blower wouldn't start at all. A restart or two later and somehow, it Recommended Services. Hello. If you recently serviced the electrical system and now your AC is no longer working then it may be possible that the issue is related to the work. The first thing I would do is check the vehicle’s fuses and relays. It may be possible that one of the fuses or relays blew when the battery or alternator were The most common causes that hinders normal operation of air conditioning system on your BMW 228i 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. It draws air past the radiator cooling fins, which in turn cools the engine coolant. An electric fan mounted on the front of the radiator. The fan final stage is mounted to the fan and is controlled by the DME (engine control module). An additional belt-driven cooling fan with a viscous clutch is attached to the engine coolant pump. If the fan is on because of the ac, it will only go to high if the temp gets to 99. You can test the aux fan by doing 2 things. First think is get a battery or battery charger, at least with something that gives 12v DC. Then unplug the aux fan connector and give it juice on the positive and negative. Don't get excited too soon! That DIY by "PENER" on bimmerforums is for 1997-98 models. Your 1999 model has a different setup. Search for info. Very often the whole assembly has to be replaced. But again check to be sure that the Aux Fan is the culprit. The 1999 Aux Fan is pricy though, about $320-350 range or so.

bmw ac fan not working