MQB Webasto or Eberspächer parking heater retrofit

Tutorial made while retrofitting Webasto into Audi S3 8V, which shouldn't be supported.

Research

Schematics

Webasto aux heater system contains couple elements:

• Webasto heater unit with water circulation pump, exhaust, and intake
• fuel dosing pump with fuel lines
• water hoses
• wiring harness
• remote start receiver with antenna
• remote control

Webasto unit communicates with related modules like infotainment unit (Audi MMI, VW Discover, Seat Navi...) and HVAC (Climatronic). It will also check ambient temperature, car battery charge, and car fuel level.

Parts

Audi A3 8V webasto retrofit OEM kit

Retrofit kit for Audi A3 8V is available as a whole set of needed parts and accessories:

• 8V0-054-960-E - TDI, front-wheel drive (PR-1X0)
• 8V0-054-960-D - TDI, all-wheel drive (PR-1X1)
• 8V0-054-965-C - 2.0 TFSI, front-wheel drive (PR-1X0)
• 8V0-054-965-D - 2.0 TFSI, all-wheel drive (PR-1X1)
• 8V0-054-965-E - 1.0, 1.4, 1.5 TFSI, front-wheel drive (PR-1X0)

I can't see an option for 1.8 TFSI, but I assume that it will be the same as for 2.0 TFSI, since both engines are from EA888.3 family and share a lot of components.

Also there's no option for Audi S3 and Audi RS3. Most likely this it caused by the two additional radiators. The one on the right side is taking the space that normally would be available for the Webasto unit. Also the washer fluid reservoir is relocated to the right side of the vehicle, which obstructs the path for water hoses.

In case of Audi RS3, you have some room under the hood, because the battery is relocated to the trunk.

Webasto Heater

Audi S3 (8V) 2.0TFSI extra radiator on the right side

There are two versions of the Webasto Thermo Top Evo heater unit:

• Diesel (Thermo Top Evo D)
• Petrol (Thermo Top Evo B)

Telestart Module

• 4H0-963-271-E - Audi Telestart module by Eberspächer.

Antenna

There's a fakra connector on the Telestart module. If Audi A3 is factory fitted with Webasto, module is connected with the roof antenna module. For retrofit there's an additional antenna that you can stick to the cars body.

I will also try to use a generic antenna from AliExpress, just to see if I can pair the remote with it. If there's a change of accessing bottom the OEM roof antenna, I would love to wire the module to it. I believe the roof antenna will provide better signal and higher remote range.

Remote

There's couple of remotes that you can use. Of course Audi has the coolest one, with the display. But I believe other remotes (VW, Skoda...) should also work, since the heater module is the same for those cars.

• 4N0-963-511 - Audi, two buttons
• 4H0-963-511-A/B - Audi, 4 buttons, red backlight (Eberspächer EasyStart R+)
• 4H0-963-511-C/D - Audi, 4 buttons, white backlight (Eberspächer EasyStart R+) by Eberspächer
• 3G0-963-511-D - VW, two buttons
• 7N0-963-511-B - VW, two buttons (T91R)
• 8K0-963-511 / 7E0-963-511-B - Audi, two buttons

Wiring kit

I've got one of those, new:

• 8V0-054-931 - wiring installation kit for Audi A3 8V. (8V0-054-931)

Paid ~€50 for it. And it contains a lot of little things that I believe will be necessary during the installation.

Installation

OEM installation tutorial was available to download:

• https://pim.audi.com/pdf/EBA/EBA_8V0054960B_pl_190315.pdf
• https://pim.audi.com/pdf/EBA/EBA_8V0054960B_en_190315.pdf

When it comes to fitting Webasto unit into Audi S3, I had to remove the units exhaust, units intake, circulation pump, and both mounting brackets. Webasto unit alone has a compact shape and will be easier to find a safe place for it. It will also require to use an universal exhaust once the unit is mounted.

TBC

Coding & Adaptation

TODO

Basic Settings

TODO

Demo

TODO

Costs

• Aux heater unit - 760 PLN
• Wiring kit - 219 PLN
• Telestart module - 180 PLN
• Telestart remote - 92 PLN
• Antenna - 10 PLN
• Fuel Pump - 299 PLN
• Fuel line - ???
• Coolant Pipes - 269 PLN

Research & Reference

• https://www.drive2.ru/l/462004891460567069/