Use contact cleaner on the connectors and and then reseat them. About an hour. Then tackle the blower assembly if needed. The replacement of the "resistor" (actually a controller) and the motor is a deep dive into the console assembly. You have to move and remove a good number of the pieces to get to the units. 15 posts · Joined 2009. #1 · Feb 15, 2010. I've noticed recently that my heater only blows hot air - even when at its coldest setting. The centre vent is set to cold, the temperature on both sides is set to 16c. The temperature out of the upper and lower vents is hotter than the centre vents. With the AC on max, fan speed at its highest Genuine BMW Blower Motor: http://amzn.to/2ek9D9DOEM Blower Motor: http://amzn.to/2dUSrcnJust Resistor: http://amzn.to/2eFwGigT-Socket Set: http://amzn.to/2ek Take the car to an independent shop. For around $100-150, they will evacuate the system and recharges with uv dye to check for leaks. It most likely just needs to be recharged, but by a professional. The dealer cost is about $250. The A/C system is too expensive and more with labor, to quick fix with a $20.00 can. M. Hi guys, I noticed that the AC cents on the foot area only blow cold air if I turn the temperature to LOW. Otherwise the vents in foot area will blow warm air anyone has the same experience? Thanks. The rest vents all work fine. E.g when I set temp at 68 F, all vents blow cold air, except the vents on foot area blow warm air. Appreciate 0. WHY BMW AC BLOWS HOT AIR, AC BLOWS WARM AIRIf you have BMW and your AC A/C blows hot air / warm air instead of blowing cold air we will explain what can caus The tech called me half way to the dealer and said he was experiencing the same thing as me! 10 minutes in to the ride the car was not blowing out cold air. Keep in mind I’m not saying the car interior is hot and cold air is coming out and just taking a while to cool the cabin. I’m saying no cold air. For like 10-15 minutes. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor 1. I get no hot air from the air blowers. 2. I still get chilled air. 3. I can vary the air flow, ie: fan still works. I've had a look about the forum and people seem to be mentioning the FSU ( final stage unit ), although this seems to be more appropriate when the A/C has a mind of its own. My only issue is that I get no hot air from the blower. JimLev. The compressor should kick in if the Aux fan is not working, it's 2 different circuits. However once the condenser coil gets hot because the aux fan isn't working your cooling capacity will drop off, you'll get warmer and warmer air out of the ducts. New Sig, per Hitdog's request, it’s done and burning rubber. jETr94Z.