Xoutpost.com - View Single Post - Airconditioner not blowing to front dash & footwell

MRV99 · #2 01-08-2014, 04:05 PM

I have come across this issue before on my 2012 and 2013 E70. If you have a high discharge on your battery, the blower fan which runs the air in the car will not blow above a very slight amount. The blower motor does draw a fair amount of power so BMW has programed this functionality to prevent Over discharge of the battery. You may ask why does the "defrost" or windscreen blower works at max speed. Well that is due to a safety. If a person needs to use the windscreen fan/defroster, it may be because the individual is loosing visibility and BMW does not want to prevent a greater safety issue by preventing the clearing of the windscreen. How did I find this out, my 2011 was a BMW buyback because of major electrical issues(63 days in the shop). Through this process and the fact the SA is my friend, I was given access to information most people don't get. I had many conversations with the PUMA technician which was brought in because of the PUMA case. Actually he was a very high up PUMA tech because the first one working on the case could not solve the issue.

To back this up, it is -10 degrees F here and when it is this cold, the fan is on high, seat heaters on, Heated steering wheel on, and rear defrost is on. This absolutely drains the battery especially on a short trips, The X5 will NOT charge the battery due to the efficiency Dynamics BS. After 3-4 trips like this, I can assure you that I will get a "High Battery Discharge" When that happens, the blower will not work other than for the windscreen. If I put the car on the charger, bring it up past the point to where the "high discharge" alert is not present, the blower fan works exactly how it is supposed to.

Sorry for the long winded answer but I just wanted to be clear how I came across this and hopefully back it up with some facts. Good luck

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