Hmmm.... in my real post didn't work as expected - should have taken to the actual header - instead took into the beginning of lengthy post.
Trying the same below:
EDIT: Indeed, doesn't take to the end of the post where the chapter "Heater unlocking" resides
Trying the same below:
From the factory T6 Webasto aux/parking (water) heater comes configured to heat cabin only.
Up here in Finland the vans come with overhead control/timer panel to allow the use of timer or remote to switch on engine and cabin preheating before setting off. The heater is configured by dealer to heat both engine and cabin.

The trick that makes the heater to warm both engine and cabin is to configure the coolant change-over valve as "not installed". See coding screenshots below.


In this configuration the flow of coolant will be as shown in the picture...
Up here in Finland the vans come with overhead control/timer panel to allow the use of timer or remote to switch on engine and cabin preheating before setting off. The heater is configured by dealer to heat both engine and cabin.

The trick that makes the heater to warm both engine and cabin is to configure the coolant change-over valve as "not installed". See coding screenshots below.


In this configuration the flow of coolant will be as shown in the picture...
- mmi
- how to guide t6_modified vcds webasto webasto air top
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- Forum: VCDS-VagCom / Carista / OBDeleven
EDIT: Indeed, doesn't take to the end of the post where the chapter "Heater unlocking" resides
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