Working on mine now. Seems it powers in both directions. I put in a test piece of heater hose and pulled the valve out. I have lots of heat now. It works in both directions out of the car but must have been stuck. It did not throw any codes.
Oddly I have found a couple of Passats that have not had Bluetooth installed in but had the NAV radio installed.
So would a highend Passat not have Bluetooth with a RNS510 installed?????
My VW manager said that some came with the MDI cable only. He did a search of the 2014 Passat VIN and...