Audi A8 D2 - is my interior fan broken?

[Baryonyx]

Copied from the thread I made on the A8 parts forum...

Afternoon,

I've finally got round to bringing my A8 home today. As I was driving along, I've noticed that I don't seem to be able to get the interior fans blowing air.

I've included a picture below of the fan setting I had as I parked up:





Now, unless I'm missing a master control button somewhere (I don't have an owner's manual), there just doesn't seem to be any air coming out of the vents. When I'm driving along, there is the faintest wisp of cold air coming through the vents, as though cold air is being forced through the system but it's not actually doing anything.

It doesn't make any sound, even on the max setting here. I was speaking to a mechanic friend at lunchtime and he thinks it could be the fan itself that has packed in, and that removing it and testing it's circuit would be a good idea.

Or perhaps I am just missing a trick, and I don't really need a whole new fan motor? If I do need to get at the fan to test it, how would I go about doing that?

[Waugh-terfall]

This might be of some use.

http://forums.audiworld.com/showthread.php?t=27559...

[Baryonyx]

Thanks. I've also asked over on the A8 parts forum. It seems I'll need to run an multimeter on some parts to see if there is still a circuit going there. It looks as though it could be the relay for the solar roof panel causing the issue, that seems relatively common.

Either that, or it'll need a new blower motor. Both jobs look doable myself, either changing the relay for the solar roof in the driver footwell or opening the blower compartment behind the glovebox and replacing the motor in there. Now, to go and get a multimeter...

[Traveller]

There should be a decent blast of air coming from the central vents, you should also hear the fan when on the maximum setting.

[Baryonyx]

Something is definitely amiss. Not to worry though, I've ordered a multimeter and I'll start chasing up the problem when it arrives.

I took my brother out for a spin in it earlier, the first time he has seen an A8 up close. He was blown away by it. I still am myself!

[grecomarchetta]

I had my multimeter in hand and was ready to really dig in to the complexity of this issue on my 98 A8 D2. Then I read a post about many of the A8D2s coming out with the main blower fan wired backwards. I got into the blower compartment and upon inspection of the wiring going into the blower it seemed pretty strange the the brown wire from the loom was connected to the red wire on the blower. I disconnected the connector and with a few jumper wires reversed the wiring and the fan volume doubled at least. After testing I permanently flipped the wires and sealed everything up. And it works like a charm. Three Audi mechanics had looked at this and I think that everyone, including me, was looking for a complex solution to what was a simple fix. Good luck!