zakress

My blower motor went out upon research seems to be an issue with the control module that causes premature failure in the motor (and will for the life of the car). I got a replacement off of Amazon for $60 with a 1 year warranty, took 45 min to install at first try and its been 18 error-free months thus far. I would recommend saving the $200+ dollars over dealer, value prop is hard to beat.

frqflyer

In that pic it looks like the brushes had plenty of life and the commutator looked pretty good still. I'm sure any carbon or oxides are on it that it could be cleaned up with a little 600/800 grit sandpaper. With people saying that it squeals and varies with temp it sounds more like a bad bearing. If that's the case you could probably service the existing motor for a few bucks. The bearing codes are usually stamped on the side of the bearing to get a replacement online. If you're looking for a simple fix though it is easiest just to replace the darn thing if you can find one cheap.

ryan2036

I have the same issue. Resistor and blower replaced but still no luck. Have you sorted yours?

Amandao

Is this what is sounded like when your blower motor was going? I put a video of how mine sounds, with the heat on it’s really loud now and without the heat on you can still somewhat hear it

Lawlor

I'm having the same issue!
Did replacing the motor sort the problem for you?

guho

Hello, I need to do this replacement on my 2007 Q7. Part number 7L0820021Q for the fan. Now the question is whether the aftermarket $50 versions are a lot noisier or lower-quality than the OEM ($300) part. For instance, for a while I had an aftermarket rear wiper motor in my Q7 and it was a lot noisier than the OEM motor. Now I got a used OEM wiper motor in there again and it is a lot quieter. Does the same hold true for this blower? Thanks.

B490MTL

I can tell you that you will hear a difference. I got one from TYC and the first few months you definitely heard a difference. But as the brushes machined themselves it got quieter.

Mogambo88

I have same problem did you resolve this.

'10Q7TDI_Prestige'

Nothing works on this car if the battery management system (BMS) is unhappy. If a low battery is sensed, it shuts down all sorts of useful accessories, like the blower fan.... Invest in a VAG-compatible scantool, and see what your car can't tell you...you have to look.

uconnkoala

How did you end up getting the fan cage off without opening up the rest of the motor? 4L1820021B

I recently tried this surgery with my motor (teardown video coming soon....) and I wasn't able to pull the fan without completely destroying the whole thing, since I couldn't get the shaft to stop turning to get a good grip.

I ended up destructively taking apart the rest of my motor, cleaned the copper and brushes, re-lubed, and tested just the standalone motor....which then turned ok, but could not be permanently reinstalled because of having to bend the metal tabs holding the components in.

I should note that I also replaced the blower motor resistor (3C0907521F), as I have heard that sometimes the failures come in pairs, with the resistor output causing wear to the motor, making it difficult to troubleshoot.