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-   -   defrost blows hot vents blow cold (http://www.bimmerfest.com/forums/showthread.php?t=658024)

tommyv 11-13-2012 05:49 PM

defrost blows hot vents blow cold
 
a new HVAC problem here...when set on auto at my standard 70 degree setting the defrost vents on the dash all blow warm air as expected on a 40 degree day but all the upper vents are blowing cold air. even if I turn the temp dials up to 80 and adjust the air temp in Idrive for the hotter setting, the air is ice cold from the vents and hot on the upper defrost vents. Any ideas? I've kept my HVAC settings the same for the last 2 years so I noticed this problem immediately.
Thanks!

kushane 11-13-2012 07:02 PM

Go to 'Vent Setting' in the Climate section on your idrive and check the temperature for the center vents (setting between the - and + signs). It probably has one or more blue bars as opposed to the red. Center vent temps are independent of the temperature knob setting. Love this feature since it lets me blows slightly cold air on my face while keeping the car warm.

phlfly 11-13-2012 07:57 PM

+1. Every year for last 5-6 years I read like this post during first cold and than hot weather. Remember BMW has one best dash vent controls in the industry, but just need to remember it.

tommyv 11-14-2012 04:46 AM

I should have mentioned this in my original post but I'm very familiar with the vent settings in Idrive and all vents are set to blow warm air. And it's been cold here for weeks so if it was related to the vent settings I would have noticed it awhile ago. This was a situation where yesterday morning, while on "auto" all vents blew warm air - Got in the car to leave work later in the day and all vents blew cold except defrost which blew warm.

I've done a fair amount of searching and most of what I've found has to do with all vents blowing cold not this situation where the defrost vents still deliver warm air

Oceans10 11-14-2012 05:22 AM

i have something similar where during hot summer days w A/C blowing, it blows scalding hot air into the footwell.
I have not been able to solve it so far.
I know there are some regulator switches for each vent area, and it is computer controlled. Thought one of them needed replacing, but then one day i noticed the little side vents in the upper dash were also blowing hot air. The ones that point towards the side windows.
I had same issue with my old e39 and was never able to solve it.

Have tried diagnosing with Autologic, but nothing comes up.
I am living with it for now as it is colder outside, but at some point I need to leave the car with a genius who can figure this out.

FCman 01-02-2013 07:01 PM

Quote:

Originally Posted by Oceans10 (Post 7193938)
i have something similar where during hot summer days w A/C blowing, it blows scalding hot air into the footwell.
I have not been able to solve it so far.
I know there are some regulator switches for each vent area, and it is computer controlled. Thought one of them needed replacing, but then one day i noticed the little side vents in the upper dash were also blowing hot air. The ones that point towards the side windows.
I had same issue with my old e39 and was never able to solve it.

Have tried diagnosing with Autologic, but nothing comes up.
I am living with it for now as it is colder outside, but at some point I need to leave the car with a genius who can figure this out.

Did you ever get his problem solved? I have hot air blowing through the dash vents too no matter what I do to the dials.

Oceans10 01-02-2013 07:19 PM

No, but now in winter I don't mind.
Will look into it again in spring.


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