Retrofitting a auxiliary heater to a B7 1.6 TDI CAYC

Hello,

I bought a B7 Variant with a 1.6 TDI engine. It's a BMT Comfortline model, so it's not the standard Bluemotion version.
I would like to retrofit the ThermoTop VEVO, but I have read that it is not possible with this engine. Does anyone have any experience with this?

Regards,
SL

EDIT by DBär: MKB corrected.

Hello,

Are you referring to the connection to the CAN bus, or is there another reason why it might not work?
Unfortunately, I can't offer any insights into what the exact problem might be. But if one knew, perhaps one could also find a solution.

Best regards, Rainer.

I read in a forum that the CAYC control unit doesn't support that feature. Since forums often contain answers based on incomplete knowledge, I'd rather ask directly here. Is there anyone who has retrofitted a VEVO and can tell me what materials are needed?

CAYC or actually CACY?
For CAYC, Webasto provides an installation manual for using the TT Evo 4 or 5 as a heating device. For CACY, this is not yet available.
Furthermore, when considering such a car, the first question that arises is whether the vehicle may already have a built-in auxiliary heater from the factory.
To avoid making assumptions based on incomplete information, I would appreciate it if you could provide the complete vehicle identification number (VIN) of the car. You can send it to me via private message if you don't want to post it publicly.

Hello,
is of course a CAYC
Could you please send me the instructions? I would like to install the original VW VEVO unit so that I can program it via the MFA. Also, the Climatronic would then be controlled. I will send you the vehicle identification number (VIN) later via private message. Thank you.
Regards,
simlesc

simlesc wrote:

I would like to retrofit the ThermoTop VEVO, but I have read that it is not possible with this engine. Does anyone have any experience with this? Regards, SL EDIT by DBär: MKB corrected.

That was the initial question. The answer is :Doh, it is possible to retrofit it. The company Webasto has explicit installation documentation for the B7 model with the CAYC.
The next question was about what materials are needed. These are:
Heater, vehicle-specific installation kit, and an additional wiring harness for models with Climatronic, plus a control unit. You would have the choice between a programmable interior clock, the T91 remote control, the T100 remote control with display, and control via smartphone. The system is called Thermocall.
You can find information about the features and prices of the individual controls online. Going into detail about that would be too extensive for this context.
For the heating units compatible with this installation kit, you can choose between the TT EVO 4 or the TT EVO 5. Not the TT-V. We'll come back to that later.
The installation time is stated as 9 hours. That's quite a significant amount of time.
"Using MFA (Multi-Function Display) for control is not possible with an aftermarket solution. This would only be possible if you already have a supplementary heater and are upgrading it to a parking heater. To clarify this, I wanted to check the part number. It might also work if you retrofit an original VW heater to the car."
The Climatronic system is integrated into this solution.

Eberspächer doesn't have a specific installation recommendation for the CAYC.D engine, but they do have recommendations for other engines within the same model series. However, there isn't a separate recommendation for every engine code. This has always been the case. I would say that you can have a properly installed Eberspächer heater installed there, just like you would with other engines.

Now, let's get to what you want. The TT-V. I didn't even know they made it as an Evo now. But that's not important.
The TT-V is a heater that Webasto does not sell for retrofitting or repairs. It is only intended for original equipment (OE) applications. For example, the excellent auxiliary heater found in the Touran comes from this series. This means that you must purchase all parts for this heater, or for any later repairs, from VW, not from Webasto. Webasto will immediately refuse to provide service if they determine it is an OE heater.
You'll need a VW installation guide for that, not a Webasto one. You'll need to check with the car dealership to see if it's even possible.
I can't send you the Webasto installation instructions because of the copyright on the document. Please ask your Webasto contact. You probably won't be installing it yourself. Otherwise, the document usually comes with the vehicle-specific wiring harness.

Then there's the diagnosis/unlocking: For OE retrofitting, if possible, or upgrading an existing auxiliary heater via OBD. With Eberspächer retrofitting, this can be done through certain control elements. And with Webasto retrofitting, it's not easily possible without additional equipment. You'll need a special adapter and software for that.

Hello,

Thank you for the response. I probably didn't express myself clearly enough... I would like to buy a used Thermo Top VEVO. It should be an "original" VW part, because it can be completely controlled via the MFA (Multi-Function Display), etc. And I read that specifically these "original" VW parts might not be compatible. I have now looked at the corresponding documents on Erwin (siehe Fehlerdatenbank), and there is also a section for the CAYC (model) there. So, it should all fit. Now I just need to figure out which parts I need. Is there a way to view AKTE online? Similar to Erwin (siehe Fehlerdatenbank)?

Best regards,