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11-22-2014, 08:01 PM | #1 |
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Question about automatic climate control...
So as a new owner of a 2013 35i, I'm finding one of the most baffling systems on the car to be the automatic HVAC. Damn thing seems to have a mind of its own, but then maybe that's by design! Adding to this obtuseness is that the section in the owners' manual dealing with this has got to be the worst section of this generally useless publication!
So let's start with a simple question. How in the hell do I get this thing to simply pass ventilation air through the cabin without heating it? Is this simple function a lost art among Bavarian engineers? I have tried everything I can think of and the system always seems to add heat to air coming into the cabin, even on the lowest temp setting. This, as you can imagine, is not helpful when it's 75 degrees outside here in Calif.! |
11-22-2014, 10:49 PM | #2 |
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Have you tried moving the dial (located inbetween the two center vents) towards the blue side (cold)? If it is turned towards the red/ hot side you're going to get heat even if the temperature dials are set colder than ambient temp.
Seems as if this simple mechanical dial overrides whatever temperature is set even if it is just the air out of the upper vents. |
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11-24-2014, 09:09 AM | #3 |
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I think you can turn off the AC via the button and then turn the nobs down to be lower than the outside/inside temperature and it will just vent.
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11-24-2014, 09:14 AM | #4 |
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11-24-2014, 09:18 AM | #5 | |
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Drives: 2012 E89 Z4 35is, 2017 F87 M2
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Current: 2012 E89 Z4 35is, 2017 F87 M2 Previous: 2008 E92 335i Coupe, 2007 Subaru Legacy 2.5GT spec.B, 1993 Dodge Stealth R/T Twin-Turbo AWD, 1994 Ford Taurus SHO |
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11-25-2014, 12:53 PM | #7 |
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If I'm not mistaken (and I haven't got the car here now) the system automatically defaults to auto mode upon startup. Is there a setting to defeat this?
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11-26-2014, 01:06 AM | #8 |
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I previously had a E92 335 with an N54 engine that exhibited the same behaviour and I have the same issue with my Z4 (which also has an N54). Based on numerous posts on the 3 series forum, it appears to be largely attributable to the N54 - the engine gives of a significant amount of heat that is not effectively dissipated, affecting the temperature of the air flowing through the vents when the AC is off. In the 335 this also manifests itself in reports of the sides of the transmission tunnel in the footwells also being hot to the touch. If you search the 3 series forum you will find a number of posts from E90 and E92 owners with the N54 engine citing these issues.
In my experience, although it is an issue in the Z4, with its less densely packed engine bay (which seems to allow for better heat dissipation), it is comparatively less of an issue than it was in my E92.
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11-26-2014, 09:43 AM | #9 | |
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11-26-2014, 10:56 AM | #10 | |
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1) Turn on the A/C. 2) Put the roof down. You fail if you select option number one. |
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11-26-2014, 12:01 PM | #11 | |
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By the way, I tried my suggestion above and it puts ambient temp air into the cabin. I wasn't hammeriing on the car so I can't verify whether or not the air would have been heated by the engine (oil gauge was at 210F when I gave up being eco and turned the AC back on) |
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