MK7 Climatronic upgrade with instructions and pictures.

[Belthasar]

Air now goes where I want when I want, it's glorious. I've got a fault for recirc flap position, gotta see what I screwed up... thinking I may have mispinned at the HVAC, which is an easy fix.

Excellent work! I am in awe over your diligence.

Do you also have the ability to do defrost + floor simultaneously now?

 

[Cuzoe]

Excellent work! I am in awe over your diligence.

Do you also have the ability to do defrost + floor simultaneously now?

Yes I do, any single selection or combination of selections work. Max defrost also works. I had to the flap whatever basic settings a few times but after that it's been great.

I did scan again this morning and got a "short to ground" and "short to pos or ground" fault for the recirc/backpressure position sensor so I'll need to fix that, then I'll be golden I think. I'm really hoping I mis-pinned and that it's not the motor. I swapped that motor from the climatronic box I got on eBay as it's different from the manual HVAC motor. They are cheap enough (like $25-40) on eBay but I'm not particularly interested in removing the glovebox again to replace it (although I imagine it will go much quicker the second time around).

It's not possible to get the fresh air intake in with the motor/gear assembly attached. So you have to get it all clocked after the fact. Luckily it's all sort of keyed and only goes in one way. But then you've gotta get the screws in too... it does indeed suck, haha.

 

[Cuzoe]

Checked the wiring between panel and the fresh air motor, all good. Seems the position sensor in there is bad . That piece was brought over from me climatronic box I picked up. I'll order a motor on eBay.

I can connect it electrically first to make sure the only fault is missing basic settings. After that I'll have to find a few hours to remove the glove box and get it replaced.

 

[Cuzoe]

Went back and looked my pictures, the V425 that came on the climatronic box I ordered is PN 5Q0907511L. Per parts.vw.com the part number should be 2Q0907511F (Valeo, which I have) or 5WA907511C for Denso. I'm hoping that's the reason I'm getting the position sensor short to ground.

I clearly got too excited and mixed the part numbers when I was "confirming" everything was correct. it does mean the glove box is coming back out, but the hopefully correct 2Q0907511F was only $18 shipped so that's a win.

 

[cbaldan983]

Hello World!

Me first post around here, mates!
I've been postponing this retrofit for a while in my 2020 GTI S, but I like so much the Auto functionality that I decided to do it. What is one more retrofit to drive me crazy and then I love it at the end, right??!

First of all, nice to see such a nice comunity as we got here.

Second, I did the installation in an easy-peasy way that I'd like to share with the forum, but I don't want to derail the conversation, this thread has been going for many years and @Cuzoe is miles away from where I am. I got pictures to share. Should I wait a better time?

As of now, I have both temp sensors installed, the sun sensor, but I used a NAR 2015 GTI control unit, PN 5G0907044AN. But no matter what I tried to do the initial run-in using key press combination, or in OBDEleven, it would not engage the AC clutch, I had to put the original control back in the car.

I'm returning it and I bought a "VW Golf R Climate Control Switch HVAC MK7 MK7.5 15-19 OEM 5G0 907 044 CF".
I hope it being a 2019 model makes it more suitable for a 2020 GTI.

 

[Cuzoe]

@cbaldan983 I say post away. One might argue that most of my posts are off (to the far left or right of) topic... And I'm not even just talking about this thread .

 

[Goodbar]

Amazing work, @Cuzoe. I haven't gotten thread notifications for months and just caught up. FWIW, the recirc flap reversal issue I had was due to coding, see post #390, not wiring polarity.

So it looks like most of the limitations can be resolved by swapping defrost and recirc motors, which doesn't require ripping out the dash?

Can the Climatronic harness be installed without ripping out the dash? I have the retrofit harness and DIY sun sensor harness and would prefer to not keep cobbling for the recirc motor wire additions.

 

[Goodbar]

Went back and looked my pictures, the V425 that came on the climatronic box I ordered is PN 5Q0907511L. Per parts.vw.com the part number should be 2Q0907511F (Valeo, which I have) or 5WA907511C for Denso. I'm hoping that's the reason I'm getting the position sensor short to ground.

I clearly got too excited and mixed the part numbers when I was "confirming" everything was correct. it does mean the glove box is coming back out, but the hopefully correct 2Q0907511F was only $18 shipped so that's a win.

Are those the wires you swapped? ETKA lists the "L" part, I'd be surprised if that's the problem.

 

[Cuzoe]

Amazing work, @Cuzoe. I haven't gotten thread notifications for months and just caught up. FWIW, the recirc flap reversal issue I had was due to coding, see post #390, not wiring polarity.

So it looks like most of the limitations can be resolved by swapping defrost and recirc motors, which doesn't require ripping out the dash?

Can the Climatronic harness be installed without ripping out the dash? I have the retrofit harness and DIY sun sensor harness and would prefer to not keep cobbling for the recirc motor wire additions.

On our non-climatronic cars you have to remove a blue arm that currently allows the air distribution motor to also control the defrost door flap. And you install a defrost flap motor (and gearing) on the right side to control that door. You have to pull the glove box, but not the dash.

As for the recirc, the entire intake door assembly is replaced with one that has two doors. It does however use one motor (V425) and some gearing/arms to control both doors. The motor goes from a simple 180 degree (full open or full close) to a 340 degree motor (which is why it needs a position sensor). The intake box is above the blower fan, also accessed with the glove box removed. It's tight, and pain, and requires bending (and then bending back) of metal bracket... see post 489 and 490.

Are those the wires you swapped? ETKA lists the "L" part, I'd be surprised if that's the problem.
View attachment 305468

The wires for the position sensor are not present in a non-Climatronic car, so they were added. It's possible this motor just has a failed position sensor.
The wires I swapped were the two existing motor wires. These now check good per the wiring diagram, they did not check good prior.
- At this time all my wiring matches the schematic.
Also not the first (second or third) time parts.vw has steered me wrong. Good thing is the eBay motor I ordered was only $18.




I guess there are a few things to try...
- Swapping V425 pins 5 and 6 back (this would make them wrong per the schematic though, and does not make sense to me)
- Changing Byte 6 Pin 3 as you did (but then reverted?) in Post 390
--- This is odd to me, maybe something "funky" with this bit is why the retrofit harness swaps these wires???
- Obviously I can plug in the motor I ordered on eBay and see if the fault remains.
--- If the fault clears, I could order another of the current motor since that's what ETKA shows.

 

[Goodbar]

Thanks for the info. Guess I need to confirm the retrofit harness pinout for recirc.

I will probably try to put in the fresh air intake door assembly and defrost servo with gears. Guessing retrofitting the factory Climatronic harness is not feasible without pulling apart the dash?

I've been burned by parts.vw.com, so always try to corroborate with another source. In this case it looks like those two V425 PNs interchange if you believe the multiple eBay listings for knockoffs servos.

 

[Goodbar]

View attachment 305484


I guess there are a few things to try...
- Swapping V425 pins 5 and 6 back (this would make them wrong per the schematic though, and does not make sense to me)

Note that V425 pins 5 and 3 are linked to ground internally, so maybe swapping motor wires is shorting to ground and affecting the position sensor? I agree that correcting the wiring to the schematic seems like the right call.

Side note: I still don't understand how the Climatronic module can detect the position of the recirc flap with a V113 installed, which doesn't have a ground or position sensor (post 388). But, if your intake assembly + V425 retrofit works, great.

 

[Jachas]

Guessing retrofitting the factory Climatronic harness is not feasible without pulling apart the dash?

Nope

Side note: I still don't understand how the Climatronic module can detect the position of the recirc flap with a V113 installed,

By current. When current starts to climb, it knows that flap reached it position.

 

[Cuzoe]

@Goodbar And to add to @Jachas comment, V113 only has two positions so the manual HVAC module doesn't need to know any position except the end stops (opened or closed) which it senses when the current increases. That's what the end stop learning procedure is taking care of.

You don't need to pull the dash out to lay in the new harness, but will need to remove the glovebox, sides of the center console trim, and all the trim in the driver footwell area. I ended up just stealing parts of the spare harness I bought and adding to the existing harness, zip tied right along with it.

Swapping the pins to not match the wiring diagram is easy enough to try, although as we all seem to agree it doesn't make sense. For what it's worth I did NOT do wiring checks of my spare factory harness (or the harness that came with the full climatronic box from ebay) so maybe they are in fact swapped from how my car is currently wired. That would mean the Erwin drawing is wrong (and is wrong in all the other drawings I have from Erwin... Golf R, Passat, Atlas, Tiguan etc. which doesn't seem likely).

I also did NOT look at Byte 6 bit 3. I suppose if swapping this bit reversed the operation of your (@Goodbar) V113 door maybe it is changing where the HVAC module "expects" the ground side for that motor.

 

[Goodbar]

I just bought a complete Climatronic "heater" assembly (Valeo) on eBay, so I'll be following in your footsteps, @Cuzoe.

Still not convinced on the V113 position. Running the end stops procedure shows 0% and 100% as actual values, but in operation, fresh air is 32%. I've visually confirmed this, too. But this is largely academic, since it appears that it won't work correctly without the Climatronic intake and servo.

 

[Cuzoe]

Still not convinced on the V113 position. Running the end stops procedure shows 0% and 100% as actual values, but in operation, fresh air is 32%. I've visually confirmed this, too. But this is largely academic, since it appears that it won't work correctly without the Climatronic intake and servo.

That's interesting... If I were programming something like this, given specs for the motor, I suppose there's no reason I wouldn't be able to estimate (with decent accuracy) the position of the motor/flap if I had determined the end stops.

Agreed it's all academic but it's still fun/interesting... were you looking at V113 position when using the manual HVAC panel? I wonder in what situations it would (although it could via estimate) command anything other than fully open or fully closed.

Or were you looking at position with the climatronic panel, so physically V113 but the panel expecting V425 with position sensor?
- Did you happen to see @Jachas post here about how the Climatronic Intake (dual door, and V425 works?
- Maybe the 32% you're seeing is also an estimate.

AFAIR, at least in Denso style witch have second door, it works in way that 3/4 of the maximum range of the motor and gearing is for opening and closing bigger flap for recirc function, 1/4 left is for aircare and back pressure.

And this range is "divided", like aircare and back pressure had its own, separated range. To visualize what I want so say



0-------|---------------------50--------------------|-------100

Aircare/Back pressure | Recirc | Aircare/Back pressure


At the beginning and at the end of engine range, the extra flap is opening or closing (This is what I remember form facelited Euro-spec A6 Jetta with climatrionic, with similar mechanism like in MQB Denso)