No hot or cold air blowing from my Audi A4 B6 2004 - help: child on board

[audipen]

Hi folks, wondering if you guys can help: I have no air blowing through the vents/windscreen of my 2004 B6 and it doesn't matter if its hot/cold. All the forum posts point to either hot or cold air or one-sided air but in my case, I have NO air at all. With winter looming and a child, I really need to get this fixed.

The dual climate control works (I can set the vents and temperatures etc.) and having removed the glovebox, I can confirm the actuators work (as do the RED/GREEN lever arm thingies). However, nothing actually blows and I'm driving with a handkerchief to wipe the mist - not ideal.

I do recall the blowers intermittently working for a couple weeks or so before something packed in completely which suggests it was a gradual death of a key component. I don't have any equipment to test fault codes and I've checked the fuses which seem ok. I'm thinking it must be a local fuse or fan/blower perhaps? Forums refer to a resistor and fan but I there are no detailed instructions on how to swap out.

Any advice folks?

[pdlh]

To clarify,

If you open the 4 vents on the dashboard, and press the middle button on the right side of the dual A/C controller, then turn up the fan speed, does the air blow out the vents that face the driver/passenger seats?

If this is working fine, this really points towards one of the stepper motors which has stuck or jammed, which when you select the windscreen, diverts the air to the screen. This is what happened on my car. I went through a bad winter 2 years ago, with a rag in the car! But I found it started working properly again when the weather improved.

If you have VCDS and the cable, I believe there is a setting you can run, where it forces the stepper motors to run the full length of their movement. It's like a test function. If something is jammed, it might be enough to clear it.

Alternatively, if a stepper motor has packed up, I'm not sure how much replacements are, I guess £100 each? I'm not sure what is involved. I personally have already set mine to screen, and I'll use it this way thoughout the winter months, just to ensure when I need it most it does not fail to blow on the screen.

Last thing I'm thinking, when you have the glovebox out. you could try and identify which stepper motor moves the air to blow on the screen. If this is not working, you could maybe manually remove the motor and force the vent by hand into the screen position? Just a cost free thought.

Hope this gives you some ideas

Paul