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Old 06-14-2015, 09:59 AM   #1
mp333
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*** AC Outside Airintake Flap shut all the time?

My AC Outside Airintake Flap are shut all the time. Doesn't matter if I change the setting to both recirculate mode or turn it completely off. When the recirculate is turned off is it suppose to open the flap near squirrel cage fan to pull in fresh air?
The flaps only open when the car is turned off.
Any thoughts?

Thx
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Last edited by mp333; 06-14-2015 at 10:33 AM.
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Old 06-14-2015, 11:04 AM   #2
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Does it change when you set the 3 buttons on the left (windshield / face / legs) to ON and turn the recirculation fully off?

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Old 06-14-2015, 11:09 AM   #3
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Does it change when you set the 3 buttons on the left (windshield / face / legs) to ON and turn the recirculation fully off?
I dont think it did...
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Old 06-14-2015, 11:12 AM   #4
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Please make sure, switch all 3 of them to ON and put the fan on full blast, make sure its not on AUTO, on my car they tend to be closed when in AUTO mode. Just put your hand over the hood intake holes, you should definitely feel lots of air being drawn in.

If not, I have no idea what's up with it.
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Old 06-14-2015, 11:58 AM   #5
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Thanks. I will check.
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Old 06-16-2015, 06:46 PM   #6
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So, what's up with it? Does it work properly afterall?
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Old 06-16-2015, 06:53 PM   #7
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Sounds like a faulty AUC Sensor (that's the little rectangular box on top of the fan shroud about 4"x1.5"x1" with a two wire connector. A scan of the IHKA system will verify if this is the cause.

Here's how it works:

AUC SENSOR(V):

Automatic recirculated air control (AUC) is an additional feature controlling the automatic operation of recirculated air. The AUC feature uses an oxidizable gas sensor usually mounted behind the right side of the radiator or the right side upper portion of the fan shroud (samples air quality as coolant fan pulls across the radiator). The AUC sensor contains a combined heating element (powered by the IHKA module) and a gas sensor. The gas sensor requires heating to work efficiently. The sensor produces a varying voltage based on air quality (concentration of hydrocarbons, NOX, SOX, and CO). The voltage increases as the air becomes more polluted. After it reaches a preset value, the IHKA closes the fresh air flaps. To prevent glass fogging, the system has built-in time limits: 3 minutes when heating and 12 minutes when cooling. With normal air quality, the AUC sensor reads about 0.5V. If the AUC sensor voltage increases to 3.0V, the ventilation or fresh air flaps will close (0%). At about 2.5V, the fresh flaps will read about 20% and 100% (fully open) at 2.4V.
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Old 06-16-2015, 06:56 PM   #8
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That's only used if he has set the recirculation in automatic mode, and he said he had it completely off and it made no difference, so that's an incorrect assumption.
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Old 06-16-2015, 10:01 PM   #9
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Quote:
Originally Posted by FrozenHaxor View Post
That's only used if he has set the recirculation in automatic mode, and he said he had it completely off and it made no difference, so that's an incorrect assumption.
I haven' t read the op say that at all. I saw you had told him to turn off auto but he never said that it was only that he'd check and three was no response.
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Old 06-16-2015, 10:02 PM   #10
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FrozenHaxor - I have not had the chance to check. Will update as soon as I can.
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Old 06-20-2015, 03:56 PM   #11
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Does it change when you set the 3 buttons on the left (windshield / face / legs) to ON and turn the recirculation fully off?
Frozenhaxor - It does not open when I have the three buttons on the left lit and recirc off as you suggested. I did remove the AUC sensor and cleaned it. Also replace the dried up foam.
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Old 06-20-2015, 04:12 PM   #12
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The AUC sensor is only used when you have set recirculation mode to auto. It should open the flaps when the recirc is fully off regardless of it.

I have no idea why would it act like that, could there be something wrong with the flap actuator itself?

You've mentioned that the flaps open when the car is off. I believe they should close then, it's somehow inverted for you. Maybe someone who had closer previous experience with the blower motor and the actuators could share their thoughts. I was only there to spray in some evaporator cleaner, never disassembled it.
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Old 06-20-2015, 07:45 PM   #13
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So I did more testing...
I have tried all combination of switches. The only time I can get the flaps to open is when I turn off the AC. The flaps open with the recirc off. When recirc is on with AC off the flap closes. So it seems to work fine with the AC off. When AC is on cant get the flaps to open with recirc off.
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