nismofreak1208

Hey all,

So all the buttons work on my climate control to include vent controls but no air blows at all. No hot air, no ambient air, nor any cold air. Any thoughts on what this may be?

MP4.2+6.0

Sounds like the obvious to me--no HVAC fan. Check fuse as one preliminary item.

And for my usual question on these fan questions...do you have a solar roof by chance?

nismofreak1208

Yes, my car came with the solar sunroof option. Is the fuse located on the driver side panel?

nismofreak1208

So is it possible my hvac motor is shot since my fans run during the day?

JohnnyJ A6Q

Your statement is confusing, "since my fans run during the day", does the fan work at all ?

It is only one fan, as in one fan motor, not "fans", So if your fan is not running at all at any time of day, then replace it, WHAT MP is saying is that if you have the solar roof then the fan motor's life is shortened because it has run much more then the non solar units.

JohnnyJ A6Q

https://www.audiworld.com/forums/a8-...2847341/page2/

MP4.2+6.0

BINGO! It's now like 100% across a bunch of D3's in past year or so that as soon as someone says fan issue, it invariably has the solar roof each time I ask. FWIW, seems like Audi forgot to tell owners that besides the solar option cost, they would be upping for a new fan every ten years or so.

Editorials aside, consistently w/ no fan action and solar roof, the HVAC fan is headed south. Had it on my C5 4.2 too...and don't intend to repeat it with another one given the consistent long term reliability issue. If it is erratic right now, figure brushes may be right on verge of their full wear limit, and ability to still work/connect is temperature dependent. Also, forget the fuse if it runs at times; it is getting juice as that shows.

Fix is new HVAC fan. Or a few have been doing brushes if you are up for it and intend to DIY rather than use shop. Search and you will find posts on the removal and replacement and/or the brushes idea and sourcing. To be clear, there is only one fan even though you might think you have separate driver and passenger control. You actually don't; two squirrel cage fans on one motor shaft and either set of console fan speed buttons raises or lowers fan speed for both sides.

nismofreak1208

Sorry for the confusion. I test my HVAC this morning and the fans came on but would stutter in speed. On a hot day, they will refuse to work at all. Thank you all for the info. The HVAC seems like a easy job to undertake after seeing the thread. Even though it's too late, I still turned off my solar operation.