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Intermittent heater blower fault - 2009 A4 2.0TDI 143

Number8 Aug 10, 2018

  1. Number8

    Number8 New Member

    Hi there,

    Could anyone offer some advice? I have an intermittent heater blower fault, and haven't come across a similar problem in other threads.

    Car – 2009 Audi A4 B8 Avant 2.0 TDI 143, 130,000 miles

    Problem – Intermittent heater blower/air-con

    Scenario – First thing in the morning on daily commute, the blower comes on as soon as the car is started (normally goes to auto). I can then switch the air-con on and adjust the blower speed up and down and air direction as required. The air-con is fine – icy cold when it comes on. However, if I go to use the car during the day, or when I drive the car home in the evening, the blower refuses to function in any setting.

    I have tried all of the following combinations while driving to get it to work without success:

    - air-con on/off
    - leaving all settings in auto
    - changing blower speed
    - recirculation
    - nothing at all (off), then on again repeatedly
    - parking the car in shade
    - leaving windows open
    - even stopping the car halfway from home, locking it and coming back to it!

    None of these make a difference. Sometimes the blower will suddenly come on when nearly home (a distance of about 30 miles from the office), sometimes not at all. Occasionally if I go out later on in the evening, for example, to move the car off the drive later at night, the blower will come on again at full blast.

    As you can tell, it’s quite annoying, and seems to have a mind of its own, although does seem to follow a distinct pattern. I’d normally ignore it and open the window, but having a new baby, sometimes I need to cool the car down more quickly, so I could do with rectifying this fault. I have tried the following:

    - disconnecting and reconnecting the battery
    - checking for fault codes with OBD-II reader - none detected (I do not have access to VAG-COM)
    - clearing all vents inside and out, cleaning leaves etc. from the engine bay
    - taking the blower motor out from behind the glovebox (now I have the infernal airbag warning light on!) – spins quite freely
    - parking in shade/leaving windows open
    - shouting at the car!

    This feels like the classic intermittent fault that I’ll never fix – unless I chuck money at it, but at which parts? Does anyone have any suggestions?

    (Side note - I am about to take the car to an independent garage to have the cambelt and water pump changed as I'm not sure when/if it was previously done).
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  3. Kennyken

    Kennyken New Member

    Could be the blower resistor, that's what it's been on previous cars I've owned with this problem. I currently have this issue on my 09 a4 also

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