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7 Series / 8 Series
The BMW 7 series and 8 Series Forum

 
 
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  #1  
Old 02-05-2010, 04:26 AM
740ilbmw1090 740ilbmw1090 is offline
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Location: Wilmington de
 
Join Date: Feb 2010
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Mein Auto: 740il
00 740iL A/C problem

I was having a issue in the summer months the AC on the passenger side was blowing warmer then the driver side. I had it pressure tested by a BMW mechanic and he said the Freon level was perfect. Also the back vents were blowing warm if not hot air with the ac on. What is causing this? someone told me Bmws have weak ac systems. I would hate to believe my 98 20k z28 has a better ac system then my 2000 740il that cost almost 70g when new. any help thanks? also someone said about a ac filter where is it located i know next to the blower motor but where is that? thanks
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  #2  
Old 02-13-2010, 06:40 AM
drivinfaster's Avatar
drivinfaster drivinfaster is offline
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Location: in the sticks you piney
 
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Posts: 10,602
Mein Auto: rescued bmw's
i am not 100% certain of all of the little actuators and controls on the hvac system for the 7, other than my own e32. they only get more complex, though, as they progress.

anyway, in general terms, dual control systems, be they on bmw, mb, or domestics, have a series of blend doors and actuators (control devices), temp sensors and settings (inputs). when you get a situation where one side is delivering the requested temps and the other is not, my first check would be to verify the full operation of ranges on each side.

you could have a temp sensor that is reading incorrectly, blend door motor that is worn, or even an obstruction that is restricting the proper operation of the blend doors. or something else altogether.

ac systems are expensive to fix, and have always been, but they tend to be one thing that people have become accustomed to and will refuse to do without.

i am sorry that i am unable to give you a 'simple' fix, but i believe that your guy checking the vehicle needed to have a better understanding of the system before scratching his head and stating the refrigerant level appears to be sufficient. not that it was a wrong thing to do, but it was a 'zig' when he should have 'zagged'.

i would check with the fellow festers to see who in your area is recommended for ac repairs and go see them.

df
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