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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-27-2012, 09:39 PM   #1
KY325iMan
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It's ALIVE again, but now....

Well, after multiple delays (mostly being very busy) my 325i has started living again! I totally re-did the cooling system, ala Mango, and it's all working perfectly on the first try...(A HUGE thanks to Jperry666 for all his help on the reinstalling of all the new parts. Learned a lot about my car in the process. But naturally, it didn't solve everything! When the AC is on, it seems to come out simi-cold (but still not a/c cold) from the far left and right vents and constantly warm from the center vents. (yes, the dials are all the way on cold) Is this an external air temp sensor problem, or maybe the system just needing a recharge? Tips/suggestions always very helpful

Oh..The display on the center console says -40 where the clock used to be as well....

Last edited by KY325iMan; 09-27-2012 at 09:43 PM.
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Old 09-28-2012, 12:27 AM   #2
330i ZHP
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I would check sensors and make certain all are plugged in - or not being grounded correctly - the AC not blowing coldly is likely due to the compressor clutch not being engaged

the -40 part sounds like a bad ground (broken wire) on the outside air temp sensor
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Old 09-28-2012, 06:36 AM   #3
shanneba
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The Ambient temp of -40 on the display indicates you have a problem with the ambient temperature sensor, wiring problem, disconnected or missing.
This can prevent the A/C compressor from running.

See page 5 for a great DIY for the fender liner / temp sensor-

http://forum.e46fanatics.com/showthread.php?t=358114
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Last edited by shanneba; 09-28-2012 at 06:37 AM.
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Old 09-28-2012, 05:24 PM   #4
smolck
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Originally Posted by shanneba View Post
The Ambient temp of -40 on the display indicates you have a problem with the ambient temperature sensor, wiring problem, disconnected or missing.
This can prevent the A/C compressor from running.

See page 5 for a great DIY for the fender liner / temp sensor-

http://forum.e46fanatics.com/showthread.php?t=358114
This. In a pinch you can twist the two wired together which will make it read 122 degrees and your air will work all the time if that is the problem.
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