I just installed a webasto tsl 17 in 04 passat tdi.
It was a bit of work and was almost done when i found this pdf file for webasto blue heat.
The tsl 17 is an over the counter webasto product meant for any vehicle.
The main differences are that the blue heat comes with heater hoses and has fan control wiring harness, also had to build my own mounting brackets
I am going to make my own fan control which requires a wire to run from pin #4 from the heater unit.
Does anyone knows where i can get the proper pin(female) that inserts into the plastic connector that connects to the unit?