GOLFMK8
GOLFMK7
GOLFMK6
GOLFMKV

MK7 Climatronic upgrade with instructions and pictures.

sofro88

New member
Location
italy
Car(s)
golf mk7.5
someone checked if the air quality sensor works? if I put the car in reverse it stay open, if I was the windscreen it's stay open and even in area with a lot of pollution the sensor always says "clean air" (I checked with live data in obd eleven). thanks
 

sofro88

New member
Location
italy
Car(s)
golf mk7.5
someone checked if the air quality sensor works? if I put the car in reverse it stay open, if I was the windscreen it's stay open and even in area with a lot of pollution the sensor always says "clean air" (I checked with live data in obd eleven). thanks
Update: I changed the sensor today and now it works (I can see form live data changing the value), but the flap still only close if I press the button, not automatically. Can be the hvac module the issue? Even if I don’t see any error in it?
 

Belthasar

Go Kart Newbie
Location
PA (USA)
Car(s)
Mk7 GSW 4Mo 6MT
It's about time I finally fix the partial retrofit status of this project and follow the lead of @Cuzoe, @Jachas and company. I'm having trouble fully wrapping my head around the last 4-6 pages, though. I verified that I do have a Valeo box.

My understanding is that the V107 changes described in the last few pages address the inability to direct air where it needs to go (e.g. defrost + floor), and the V425 changes address the inability to properly set recirc/fresh air. I took down way too many part numbers in following along, and I found myself confused regarding what was the wrong part number, what was Denso vs Valeo specific, and what was simply defective. Here's what I have as a tentative part list to bring the partial retrofit up to speed, along with some questions in parentheses:

V107 Defrost Door Motor - 5Q0907511L (am I correct in reading that D or K should work, but L solved Cuzoe's ground fault problem?) Edit: this was incorrect
Defrost Flap Lever Kit - 5Q0898001A (Are these the gears that you have to install when you remove our non-climatronic blue arm?)
V107 Connector - 6Q0972706 (Any suggestions on where best to source this? Looks like options vary wide, from VW parts counters to aliexpress).
V107 Screws - N10424102 (How many of these do I need?)

V425 Recirc Door Motor (with position sensor) - 2Q0907511F
V425 Connector - 6Q0972706 (This has 2 additional pins, right? But where do they connect to? Am I soldering something? Crimping something? Tapping a wire at the climatronic panel?)

Another thing I'm having trouble understanding is the references to needing the climatronic door assembly. Specifically:

As for the recirc, the entire intake door assembly is replaced with one that has two doors.

@Jachas, I think you recently called this the recirc flap, but I don't see any part number in the thread. Just the 2Q0907511F motor. Am I missing something?

Thanks in advance!
 
Last edited:

Jachas

Go Kart Champion
Location
PL
Car(s)
A3 8V
V107 Defrost Door Motor - 5Q0907511L (am I correct in reading that D or K should work, but L solved Cuzoe's ground fault problem?)
According to Partslink, 5Q0907511L is superseded by 2Q0907511F (Valeo POTI 340), 5Q0907511D is superseded by 5WA907511B (Valeo POTI 180) and 5Q0907511K is superseded by 2Q0907511G (Valeo POTI 180), so MAYBE D would be compatible with K. AFAIR, 340 and 180 can be "position 0" of the motor or degree of range of it, but anyway, 180 and 340 are not cross compatible, as I explained in my post #469

Defrost Flap Lever Kit - 5Q0898001A (Are these the gears that you have to install when you remove our non-climatronic blue arm?)
Yes, together with V107 defrost motor

V107 Connector - 6Q0972706 (Any suggestions on where best to source this? Looks like options vary wide, from VW parts counters to aliexpress).
V107 Screws - N10424102 (How many of these do I need?)
The best is to buy used V107 with connector and few cm of cable, or aliexpress, these 2 options wouldn't ruin you, as VW is very pricey when it comes to wiring stuff (especially wires with pins)
You need 3 screws

V425 Recirc Door Motor (with position sensor) - 2Q0907511F
V425 Connector - 6Q0972706 (This has 2 additional pins, right? But where do they connect to? Am I soldering something? Crimping something? Tapping a wire at the climatronic panel?)
This part is nicely explained in Cuzoe post #470 , one wire you connect to AC unit, other one to LIN bus.

Another thing I'm having trouble understanding is the references to needing the climatronic door assembly. Specifically:


@Jachas, I think you recently called this the recirc flap, but I don't see any part number in the thread. Just the 2Q0907511F motor. Am I missing something?
You have all the info needed in Cuzoe post #473
 

Belthasar

Go Kart Newbie
Location
PA (USA)
Car(s)
Mk7 GSW 4Mo 6MT
Thank you for pointing me in the right direction, @Jachas. I hope you can appreciate that I did read all of those posts (multiple times), and dug through all of those pages (even contributing some findings myself earlier in the thread). But trying to follow what was conjecture, what failed, what was a faulty part, what could be an alternate part, and what ultimately worked is proving difficult to wrap my head around. For example, post #470 is predicated on "While this is all in theory" and it is difficult to follow what combination ultimately formed a solution. While all of the information is, indeed, buried in this thread, I'm still not able to get a solid parts list going. I suppose when I'm actually holding the parts this will all be painfully obvious. Can I pick your brain with more specific questions?

According to Partslink, 5Q0907511L is superseded by 2Q0907511F (Valeo POTI 340), 5Q0907511D is superseded by 5WA907511B (Valeo POTI 180) and 5Q0907511K is superseded by 2Q0907511G (Valeo POTI 180), so MAYBE D would be compatible with K. AFAIR, 340 and 180 can be "position 0" of the motor or degree of range of it, but anyway, 180 and 340 are not cross compatible, as I explained in my post #469
So, ultimately, am I tracking down 5Q0907511D/5WA907511B, or 5Q0907511K/2Q0907511G? Re-reading post # 473, is it that V107 supposed to be a 180 degree motor for climatronic function and V425 must be 340 degrees?

The best is to buy used V107 with connector and few cm of cable, or aliexpress, these 2 options wouldn't ruin you, as VW is very pricey when it comes to wiring stuff (especially wires with pins)
You need 3 screws
Thanks!

This part is nicely explained in Cuzoe post #470 , one wire you connect to AC unit, other one to LIN bus.
I re-read 470 and this still confuses me. First, what's the "AC unit"? And LIN bus? Are these items anywhere else in the earlier part of the incomplete retrofit? Am I adding pins to the retrofit harness? Do I have to buy some 22awg wire, appropriate pins, and a crimping tool to pin the other side of a connector?

You have all the info needed in Cuzoe post #473
So Valeo-equipped cars should swap out their box with 5WB898304? Looks like this is a few hundred bucks - oof.


Thank you for your patience in helping me gather a parts list. And thank you, @Cuzoe. I hope your travels go well and I appreciate your advice when you are in a better place for it.
 

Jachas

Go Kart Champion
Location
PL
Car(s)
A3 8V
First, what's the "AC unit"? And LIN bus?
By "AC unit" i mean AC control unit and LIN bus is one wire communication protocol to gather and transfer information in places where hi-speed data transfer is not needed, but simplicity and low cost is needed (Violet wire on pictures with schematic)

So Valeo-equipped cars should swap out their box with 5WB898304? Looks like this is a few hundred bucks - oof.
Not the box, but only recirc/back pressure flaps. Maybe doing the retrofit by buying entire HVAC box with motors and wiring would be cheaper option? Motors, plugs and pins for motors and AC control unit, recirc flap,etc. All will be included

I hope you can appreciate that I did read all of those posts (multiple times), and dug through all of those pages (even contributing some findings myself earlier in the thread). But trying to follow what was conjecture, what failed, what was a faulty part, what could be an alternate part, and what ultimately worked is proving difficult to wrap my head around. For example, post #470 is predicated on "While this is all in theory" and it is difficult to follow what combination ultimately formed a solution. While all of the information is, indeed, buried in this thread, I'm still not able to get a solid parts list going.
Hmmm, I think I would be good idea to make new thread on "comprehensive" climatic to "one zone" climatronic easy-ish retrofit, with parts listed for Denso and Valeo HVAC boxes and wiring needed to be done. I will do parts listing of things needed (and maybe coding required) but in my case, without practical aspect, as I don't had the opportunity to do it by myself.
 

bobloblawGTI

Autocross Champion
Location
DC
Car(s)
19 GTI SE 6MT
Hmmm, I think I would be good idea to make new thread on "comprehensive" climatic to "one zone" climatronic easy-ish retrofit, with parts listed for Denso and Valeo HVAC boxes and wiring needed to be done. I will do parts listing of things needed (and maybe coding required) but in my case, without practical aspect, as I don't had the opportunity to do it by myself.
I would love this personally; the retrofit was off the table for me when certain features were left inoperable, but now that a full swap is possible I’d be much more inclined to give it a shot!
 

Cuzoe

Autocross Champion
Location
Los Angeles
I have a thread drafted already, but I'm not at home, or even in home country. Dealing with this for internet at times...
Screenshot_20250206-191346.png
 

Belthasar

Go Kart Newbie
Location
PA (USA)
Car(s)
Mk7 GSW 4Mo 6MT
By "AC unit" i mean AC control unit and LIN bus is one wire communication protocol to gather and transfer information in places where hi-speed data transfer is not needed, but simplicity and low cost is needed (Violet wire on pictures with schematic)
My apologies - I am still confused about this. So are you referring to the three-knob climatronic control panel when you say “A/C control unit”? And your mention of LIN bus is just information about how it communicates, and you are not referring to separate location to add wires to? I think that’s what I’m missing from the back-and-forth over the last four pages. What exactly do the two 6Q0972706 connectors connect to? I see the wiring diagrams, but I’m trying to understand what gets pinned and where things connect on the complete opposite sides of V107 and V425. Am I pulling something from the retrofit harness and adding new pins to it? Further, it seems like one 6Q0972706 connector is completely new in this revised setup (it connects to V107, which isn’t present in manual hvac), but the other 6Q0972706 connector replaces the two-wire one attached to V113 (recirc motor for manual HVAC) with a five-wire one. Do we just leave this one dangling when we install V425? Where exactly do the five wires for the new 6Q0972706 connector connected to V425 connect to?

In trying to source 6Q0972706 connectors on eBay, aliexpress, or anywhere else, none of them seem to come with wires long enough to reach from the V107 and V425 locations to the center console behind the climatronic control panel. I’ll ask my earlier question again: am I crimping or soldering anything? Do I need to buy a set of N90764701 pins and a non-insulated open barrel crimping tool? And a spool of 20awg wire to extend the 6Q0972706 pigtails (that are usually around 15cm on Ali, and similar-length used on eBay)?

Not the box, but only recirc/back pressure flaps. Maybe doing the retrofit by buying entire HVAC box with motors and wiring would be cheaper option? Motors, plugs and pins for motors and AC control unit, recirc flap,etc. All will be included

What exactly are these “flaps”? When I read this, I imagine flat plastic panels that are deeply set inside the ducts and controlled by motors, and not something that has a separate part number. If this is way off the mark, do you have a part number for these flaps? This is the heart of what I’m having difficulty understanding. @Cuzoe bought a whole hvac assembly off a car with climatronic, and he replaced the one-flap “intake box” with the two-flap climatronic version. This had the effect of changing V113 (recirc motor for manual hvac) with V425 (5Q0907511L, 340 degree motor). So is the information in post #470 incomplete in the sense that it suggests that only V425 motor and connector are required to fix the recirc issue? As I am re-reading all of these pages yet again, it seems to me that the missing “flaps” were installed by Cuzoe because he just happened to have the expensive intake box from buying the whole assembly. But what do we do if we are not following his path and buying the intake box?

My apologies for the many questions. I deeply appreciate the work you all have done. Having held these parts and made connections, I’m sure much of this seems obvious to you. But there’s a lot that is not obvious to us who haven’t physically seen how this all fits together. I appreciate your patience.
 

Jachas

Go Kart Champion
Location
PL
Car(s)
A3 8V
My apologies - I am still confused about this.
No need to apologies.

So are you referring to the three-knob climatronic control panel when you say “A/C control unit”?
Yup. Climatic control unit is J301, and Climatronic control unit is J255. J301 has one big and one small connector, when J255 has one big and two smaller connectors

And your mention of LIN bus is just information about how it communicates, and you are not referring to separate location to add wires to? I think that’s what I’m missing from the back-and-forth over the last four pages. What exactly do the two 6Q0972706 connectors connect to? I see the wiring diagrams, but I’m trying to understand what gets pinned and where things connect on the complete opposite sides of V107 and V425. Am I pulling something from the retrofit harness and adding new pins to it? Further, it seems like one 6Q0972706 connector is completely new in this revised setup (it connects to V107, which isn’t present in manual hvac), but the other 6Q0972706 connector replaces the two-wire one attached to V113 (recirc motor for manual HVAC) with a five-wire one. Do we just leave this one dangling when we install V425? Where exactly do the five wires for the new 6Q0972706 connector connected to V425 connect to?
V107 needs new wiring. Pins 2,5,6 goes to climatrionic unit, when 1(LIN) and 3 (ground) can be connected to any other place on the wiring, as long as is LIN or ground (so you need to tap in existing wires, and if you do this close to the control unit, or close to the existing V68 or V428, doesn't matter, as long as you connect it correctly. In place of V113 (2 wires for motor only) you need to install 3 new pins for G644 position sensor inside this motor. Pin 2 goes to climatronic unit, 1 and 3 same as V107, 1 to LIN and 3 to ground. Can be tapped in the same spot with V107.


What exactly are these “flaps”? When I read this, I imagine flat plastic panels that are deeply set inside the ducts and controlled by motors, and not something that has a separate part number. If this is way off the mark, do you have a part number for these flaps? This is the heart of what I’m having difficulty understanding. @Cuzoe bought a whole hvac assembly off a car with climatronic, and he replaced the one-flap “intake box” with the two-flap climatronic version. This had the effect of changing V113 (recirc motor for manual hvac) with V425 (5Q0907511L, 340 degree motor). So is the information in post #470 incomplete in the sense that it suggests that only V425 motor and connector are required to fix the recirc issue? As I am re-reading all of these pages yet again, it seems to me that the missing “flaps” were installed by Cuzoe because he just happened to have the expensive intake box from buying the whole assembly. But what do we do if we are not following his path and buying the intake box?

So, above cabin filter, you have small box that makes possible to connect HVAC box to the firewall and having seal with firewall. Being separated from the rest of the box, make is makes it replaceable without need to change entire HVAC box. Climatic has one flap with simple, 2 position (fully open or fully closed) motor. Climatronic on the other hand, has 2 flaps and V425 motor with extra gearing + position sensor, that make possible to not only open or close flap, but makes possible for AirCare (extra air filtration) and backpressure (speed dependent opening or closing recirc flap, to allow constant air flow, no matter the car speed) functions. That's why you need to change flaps and 2pin V113 motor to V425 with position sensor
 

Belthasar

Go Kart Newbie
Location
PA (USA)
Car(s)
Mk7 GSW 4Mo 6MT
V107 needs new wiring. Pins 2,5,6 goes to climatrionic unit, when 1(LIN) and 3 (ground) can be connected to any other place on the wiring, as long as is LIN or ground (so you need to tap in existing wires, and if you do this close to the control unit, or close to the existing V68 or V428, doesn't matter, as long as you connect it correctly. In place of V113 (2 wires for motor only) you need to install 3 new pins for G644 position sensor inside this motor. Pin 2 goes to climatronic unit, 1 and 3 same as V107, 1 to LIN and 3 to ground. Can be tapped in the same spot with V107.

My understanding for V107 is that, being an entirely new addition to this setup, it requires a new 6Q0972706 connector. But are you saying that V113's connector stays in place but you just add 3 new pins to it? I ended up ordering a five-pack of 6Q0972706 with 6 wire pigtail, and a five-pack spool of 20awg stranded copper-tinned wires on aliexpress. I figure the extra connectors can be opened up and I have plenty of pre-crimped N90764701 pins to place wherever they need to go.

As for tapping, I'll have to look back at my pictures from when I did the first "partial" retrofit, as I recall tapping a wire behind J255. When the updated thread is created, pictures of where these connections should happen would be helpful.

So, above cabin filter, you have small box that makes possible to connect HVAC box to the firewall and having seal with firewall. Being separated from the rest of the box, make is makes it replaceable without need to change entire HVAC box. Climatic has one flap with simple, 2 position (fully open or fully closed) motor. Climatronic on the other hand, has 2 flaps and V425 motor with extra gearing + position sensor, that make possible to not only open or close flap, but makes possible for AirCare (extra air filtration) and backpressure (speed dependent opening or closing recirc flap, to allow constant air flow, no matter the car speed) functions. That's why you need to change flaps and 2pin V113 motor to V425 with position sensor
This is what I'm still not understanding - Where do I get these flaps? Do we have part numbers for them? Do they have to be cannibalized from a climatronic intake box ($$$)?

Here's my current parts list that I have on order:

V107 Defrost Door Motor - 5Q0907511K - $24ish on eBay. I went with an older one from a 2015 A3 that was marked Swiss-made. Seems like these Valeo units are typically made in Poland or Mexico, depending on the year. I imagine these are all pretty reliable actuators regardless of where they are manufactured.
Defrost Flap Lever Kit - 5Q0898001A - About $21 at my local dealer for pickup.
V107 Screws - N10424102 (3 total) About $3 at my local dealer for pickup.
V425 Recirc Door Motor (with position sensor) - 5Q0907511L - About $28 on eBay for a newer Swiss-made unit from a 2018 Audi Q8
V107 and V425 Connectors - 6Q0972706 - $11ish for a five-pack of six-wire pigtails on aliexpress
Five spools of different color 20awg wire, 5 m length each - $11 on aliexpress.

Help me fill in the rest:
Recirc flaps - ???????
Anything else?



As an aside: why are some of the Valeo actuators labeled 13v and others labeled 12v? It seems like the 13v ones tend to be sourced from European models. Is this something we have to take into consideration? It's moot since the actuators I ordered are all from North American models that are marked 12v, but I was just curious why there are different voltage ratings for the same part number or whether it's just a simple round up/round down thing.
 

Jachas

Go Kart Champion
Location
PL
Car(s)
A3 8V
But are you saying that V113's connector stays in place but you just add 3 new pins to it?
Exactly


This is what I'm still not understanding - Where do I get these flaps? Do we have part numbers for them? Do they have to be cannibalized from a climatronic intake box ($$$)?

Here's my current parts list that I have on order:

V107 Defrost Door Motor - 5Q0907511K - $24ish on eBay. I went with an older one from a 2015 A3 that was marked Swiss-made. Seems like these Valeo units are typically made in Poland or Mexico, depending on the year. I imagine these are all pretty reliable actuators regardless of where they are manufactured.
Defrost Flap Lever Kit - 5Q0898001A - About $21 at my local dealer for pickup.
V107 Screws - N10424102 (3 total) About $3 at my local dealer for pickup.
V425 Recirc Door Motor (with position sensor) - 5Q0907511L - About $28 on eBay for a newer Swiss-made unit from a 2018 Audi Q8
V107 and V425 Connectors - 6Q0972706 - $11ish for a five-pack of six-wire pigtails on aliexpress
Five spools of different color 20awg wire, 5 m length each - $11 on aliexpress.

Help me fill in the rest:
Recirc flaps - ???????
Anything else?

Common part list (for both, Denso and Valeo are the same):

Climatronic control unit J255
G107 sun radiation sensor: Theoretically, there are 2 versions, depending on the windshield. Sensor for PR.4GF windshield is 5G0907451 superdesed by 5G0907451C. For RP.4FW windshield is 5G0907451B superseded by 5G0907451D
G150 left vent temp sensor: 5Q0907543
G151 right vent temp sensor: 5Q0907543
G192 leg vent temp sensor: 5Q0907543A

(AFAIR, you had aliexpress retrofit kit, so you have 2 from 3 sensors, I think if you have them mounted on the left vent and foot well, should be enough)
G238 air quality sensor (black cover): 5Q0907643D superseded by 5Q0907643E
G238 air quality sensor integrated with G657 exterior air humidity sensor (brown cover): 4H0907658 superseded by 4H0907658D
(G238 in black cover is only air quality sensor, G238/G657 in brown cover is air quality and humidity sensor, you need only one of them)
G260 Interior air humidity sensor (is integrated with light and rain sensor, so it requires windshield with bracket to hold it): 5Q0 907 658 + gel foil 8U0 955 609
Connector for G260: 1C0973119B

Denso part list:

V107 demist flap motor with G135 position sensor: 5Q0907511K superseded by 2Q0907511G + repair kit 5Q0898001 with gears to install with V107
V107 connector: 6Q0972706
V107 Screws: N10424102x3
V425 recirculation and back-pressure flaps with G644 position sensor: 5Q0898304

Valeo part list:

V107 demist flap motor with G135 position sensor: 5Q0907511D superseded by 5WA907511B + repair kit 5Q0898001A with gears to install with V107
V107 connector: 6Q0972706
V107 Screws: N10424102x3
V425 recirculation and back-pressure flaps with G644 position sensor: 5Q1898304 superseded by 5WB898304


As an aside: why are some of the Valeo actuators labeled 13v and others labeled 12v? It seems like the 13v ones tend to be sourced from European models. Is this something we have to take into consideration? It's moot since the actuators I ordered are all from North American models that are marked 12v, but I was just curious why there are different voltage ratings for the same part number or whether it's just a simple round up/round down thing.
I think it doesn't matter. Probably some version or other internal labeling. Certainly it isn't voltage, as most probably, all of them work on 5V
 

Cuzoe

Autocross Champion
Location
Los Angeles
And to your question about flaps in that removable "box" above/forward of the glove box... The existing part you have there only has a single flat.

The one you have to replace it with has 2 flaps and some gearing... Which is why you are replacing that motor (and adding pins for the internal position sensor). Where your current single flat unit is either open or closed evil now have two flaps, capable of a range of positions.

I'll try to link the exact post but if you search my post history in this thread you will see some pictures from when I replaced that part. It required removing the glove box and also bending some metal, and then a lot of persuasion to get the old intake out and the new one in.

Absolutely recommend finding a complete climatronic box on eBay. Trying to buy new motors so if you're going to get used once minus well get the whole box. You will have all the motors, harnesses (meaning extra wire and pins), and mounting hardware. And also really helps to see how the gears go together. At install time you will be sort of working blind. Get your head into a spot or your arms but not both 😂. Also do yourself a favor and remove the front seats.
 

Belthasar

Go Kart Newbie
Location
PA (USA)
Car(s)
Mk7 GSW 4Mo 6MT
Good timing, guys. I just popped back in here to say I studied some of cuzoe’s pics and finally clicked - the flaps are integrated into the intake box, so my fears were confirmed - you do have to buy the whole box, which is the most expensive part of finishing this partial retrofit.

I just ordered a 5Q1898304 two-flap intake box from a recycler out of a 2015 GTI for a bearable price, but still more expensive than everything else combined. While I have it out of the car, is there any sort of maintenance that should be done to ensure longevity? I’m guessing there’s nothing to lubricate because the flap hinges and gears are all plastic.

@Jachas , thanks for the extensive part list. And good memory: I did use the aliexpress harness, and I added an extra sensor so I have left, right, and footwell. I also added the sunlight sensor. Regarding all of the air quality/humidity sensors: are they necessary for full recirc functionality? When reading though the last 4-6 pages of the thread, I got the impression that you guys just installed them since you had them, but does your post imply that I absolutely have to have them?
 
Top