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  1. #1
    Veteran Member Four Rings
    Join Date
    Oct 14 2012
    AZ Member #
    102231
    My Garage
    Empty...for now...
    Location
    SE PA

    2015 S4 - HVAC behavior

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    Over the past month I have finally gotten to my breaking point and started using the air conditioning in my 2015 S4. I have noticed what seems to be an unusual behavior, which is that I can crank the fan speed up to 8 and above, i.e. to the point where the fan noise becomes very loud, yet it does not feel like there is much air coming out of any of the vents, regardless of which distribution setting I have it on (i.e. feet only, center only, top only, Auto, etc.). There is some air flow coming out of the vents, but the amount of fan noise seems far too much for the relatively small amount of flow coming out of the vents.

    Eventually, the air coming out of the vents becomes cool enough to make the car comfortable, but in no way is it forceful or cold.....just gentle and cool. And it takes probably ~10 minutes in hot weather for the air to even start being cool. Meanwhile my wife's 2015 GTI will start giving you frostbite if it's on full blast for 5 minutes.

    In my 2012 S4 I had the pressure switch in the aircon unit fail, but the symptom was elevated air temperature and not decreased air flow. Admittedly I have not changed out the cabin air filter in the 2015 and I have 22500 miles. Does the description above sound like a symptom of a dirty cabin air filter?
    SOLD 2015 Daytona Gray S4
    6MT / Sport Diff / B&O / Tech Pkg / Carbon Atlas / Black Alcantara
    Mods: Xpel Ultimate, 3M Color Stable Tint 35%, Bilstein PSS10, Euro Code Alu Kreuz, Eurocode Sway Bars, Moog Endlinks, CR-15, Eurocode Meisterwerk ASTS, AWE Resonated Touring Exhaust, 034 Transmission Mount, HCX LED 3000k Fog Lights, Apikol Rear Diff Mount

  2. #2
    Senior Member Three Rings
    Join Date
    Jun 20 2015
    AZ Member #
    338411
    Location
    NC

    Might be a dumb question, are the vents open all the way ?

  3. #3
    Veteran Member Four Rings
    Join Date
    Oct 14 2012
    AZ Member #
    102231
    My Garage
    Empty...for now...
    Location
    SE PA

    Quote Originally Posted by Sceanzo View Post
    Might be a dumb question, are the vents open all the way ?
    Fair question! Yes they are all open fully.
    SOLD 2015 Daytona Gray S4
    6MT / Sport Diff / B&O / Tech Pkg / Carbon Atlas / Black Alcantara
    Mods: Xpel Ultimate, 3M Color Stable Tint 35%, Bilstein PSS10, Euro Code Alu Kreuz, Eurocode Sway Bars, Moog Endlinks, CR-15, Eurocode Meisterwerk ASTS, AWE Resonated Touring Exhaust, 034 Transmission Mount, HCX LED 3000k Fog Lights, Apikol Rear Diff Mount

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