Zone A/C Difference in Temp?

[CornersWell]

Well, yesterday was a LONG day for the tech. We believe the problem is now fixed. Fingers crossed, as some warm weather is due in the next week. So, I'll confirm that. BUT, here's the report...

The problem is, most likely, the driver's side servo (which is this part number: 4B1 820 511...note the lack of an alpha number code at the end). The problem is that this servo is buried behind a structural support beam and plate. VERY difficult to access. I was charged 5 hours of labor. Arrived at 9a. Didn't leave until 530p. I added an oil change, since I was there, and it was almost due, anyway. That was a few more $, but the total invoice was in the $1,150 range.

As I said, the "A" and "C" servos are confirmed to be easy enough, per the video, and my own experience. But, the " " part is a b*tch.

CW

[lswing]

Well, yesterday was a LONG day for the tech. We believe the problem is now fixed. Fingers crossed, as some warm weather is due in the next week. So, I'll confirm that. BUT, here's the report...

The problem is, most likely, the driver's side servo (which is this part number: 4B1 820 511...note the lack of an alpha number code at the end). The problem is that this servo is buried behind a structural support beam and plate. VERY difficult to access. I was charged 5 hours of labor. Arrived at 9a. Didn't leave until 530p. I added an oil change, since I was there, and it was almost due, anyway. That was a few more $, but the total invoice was in the $1,150 range.

As I said, the "A" and "C" servos are confirmed to be easy enough, per the video, and my own experience. But, the " " part is a b*tch.

CW

It's a pain finding out just which one controls what, not sure if it's in a bentley or etka manual maybe.

Here are some links i found of the part you're referring to...4B1 820 511...note the lack of an alpha number code at the end

Appears to just control the driver footwell though, and I think from reading about the other A-passenger footwell, C-central/dash flaps, and D-fresh air part options that you replaced, SOME of those also control the drivers side vents, probably dash and defrost, just not driver footwell? Driver and passenger footwell appear to be separate.

https://www.audiusaparts.com/oem-par...otor-4b1820511

https://parts.audiusa.com/p/Audi__A6...4B1820511.html

https://www.ecstuning.com/b-genuine-...eft/4b1820511/

So my guess is you will get cold air through the dash vents, and defrost vents, but not your driver footwell. Wouldn't be the worst, just toggle off the footwell fans so it's not blowing warm air at least.

Luckily i've got another car to drive as it this problems sucks when it's 90+ out...my footwell and dash drivers side blowing full on warm air, all passenger vents nice and cool, doh!