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| 04-26-2011, 08:13 AM | #1 |
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In The Flesh
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A/C ON when starting the car - question
Here is something that is puzzling me and I can't seem to set it up properly.
Every time I start the engine of my Z4 35i, the A/C turns ON and is in AUTO mode. I turn the A/C OFF, turn the car off, take out the key, lock the car... Unlock the doors, start the engine, and their you go the A/C turns ON and in AUTO mode... Any idea how to disable this function??? Thanks! |
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| 04-26-2011, 09:53 AM | #2 |
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Lieutenant
 
Drives: '09 Z4 s35i & '03 Z4 3.0i Join Date: Nov 2009
Location: Calgary
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What's the big deal? Just reach over and press the AC control button, and the Auto button if you want the auto off as well.
It's kind of handy if you want to cool down the car before you get in, start it, lock the door from the outside with the other key and it cools down or heats up to whatever temp is set...if the auto and AC are on. 
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
'03 Z4 3.0i Sterling Grey (Hers) '01 Z3 3.0i Sapphire Black, M sport package (Mine) |
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| 04-26-2011, 10:03 AM | #3 |
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Mechanical Dunce
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It's not the A/C that's in Auto mode, it's the climate-control system that's in Auto mode.
Auto climate-control defaults to having the A/C on. The A/C will not run, though, unless it's needed. For example, in the depths of winter in New Hampshire, sometimes running the A/C will dry the air enough to make a difference while defrosting, though it's pretty unusual that it will switch on. It doesn't hurt anything to have A/C on if you're actually using the Auto temperature control. If you want more granular control over climate features, turn off Auto mode and set the temperature, airflow, fan speed, and A/C the way you want them. If you turn Auto mode on then later turn it off, the system will revert to your most recent manual settings.
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| 04-26-2011, 10:51 AM | #4 |
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In The Flesh
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I was under the impression that starting the engine with the A/C on (ie compressor on) will do harm to the engine on the long run... Are you guys saying that this assumption is not true??
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| 04-26-2011, 11:56 AM | #5 | |
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Mechanical Dunce
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Quote:
It's possible that some engines (or, more accurately, starters) might not be able to handle the additional stress of starting while also running a compressor. This could conceivably cause the starter to wear out prematurely. I can't picture any way in which the engine itself could be harmed by this. It's perfectly capable of running the compressor for hours on end. Besides, the engine never starts with the compressor on, anyway. Modern cars are smart enough not to run the compressor while starting the engine in the first place.
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| 04-26-2011, 12:25 PM | #6 |
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Resistance is futile...
Drives: BMW Z4 E89(N54) Porsche 997 4S Join Date: Nov 2010
Location: Greece/Canada
Posts: 503
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Starting the engine with the AC ON has an impact only in smaller engines (under 1.400cc) and older technology vehicles but then again all you risking is a fuse or two, in our car there isnt such a problem and also, as mstevens said, there is a relay that turns the AC on a second or two after the engine starts.
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