My FSR finally gave in at 15y/140K, so I took the opportunity to take some photos for those who need to trouble-shooting HVAC Blower Motor and FSR circuit. In 90% of the cases, the FSR fails. In 10% of the cases, the HVAC panel fails. There are 2 ways an FSR can fail: 1. Not working at all (this is my case) 2. If the fan does run, then the water pump is most likely the culprit. Rule #1 with BMWs: The very second you see any evidence of an overheat warning, you pull off the side of the road, shut off the engine, and call a flatbed. No delays. No exceptions, because if you think maintaining a BMW is expensive, get a quote for an engine rebuild. BMW E90 Thermostat Replacement – 2007-2013 3 Series – N52/N54/N55. By Staff Writer. September 17, 2020. 0. 43658. Affiliate link disclosure – The BMW Repair Guide uses affiliate links in their site. For more information on affiliate links, please click here. Repair Summary. Repair Difficulty and Cost. Bmw E90 Fan Assembly 4 PIN . R4,250.00 R3,399.00. Add to Cart. Add to Wish List Add to Compare. Coolant Thermostat 80DEG .for BMW E87/E90/E46 318 . R465.00. I bought a 2011 F25 x20d on the 27/12/20. I knew it had some issues but it was cheap and I like a project. One of the main things was that the heated seats didn’t work - the three stage switches for the front seats lit up as usual but there was no heat and the rear heated seat switches didn’t light up when pressed and had no illumination to Conversely, twisting the knob all the way to the heater’s highest “4” setting was tantamount to opening the doors to 765’s firebox. That quick little bit of troubleshooting told us that the heater core was good and that the blower motor had power—the fan just wouldn’t work at the “2” fan speed. How to remove and replace blower motor resistor on BMW E90 E91 E92 E93 316i 318i 320i 323i 325i 328i 330i 335i 316d 318d 320d 325d 330d 335d 325xi 328xi Products used in the video: Blower Motor Resistor: The one in the link is the AUC sensor which monitors outside air quality for the auto recirculation function.. the interior sensor is located in the IHKA control panel right by the fan speed buttons. Located in the module behind the little screen.. hope this helps. edit: and as for no heat, I've never seen one of these sensors cause said problems. .

bmw e90 heater fan not working