Thanks. I'll have to look further over on the left (opposite side from the fuel filler) underside of the car.Not sure but if you look through the Adblue FAQ it gives a video of draining using a suction pump on a Benz. In researching Adblue fluid safety and handling, I found that the Urea will come out of solution below 11oC. I don't know if the Touareg TDI and Audi Q7 Adblue tank are automatically heated even if the car is off but that makes the most sense to me. Otherwise it'll be all crystals and water at very cold temps. Does this mean that you have to leave a trickle charger on the car if temps get that low? If the adblue tank is heated even if the car is off, I'd say yes.
Here is another view with just the adblue tank and pump in place for just the Audi Q7 TDI.
At this point, I don't know. My guess is that it probably works pretty much the same as the Touareg AdBlue tank.Is it automatically heated at 11 degrees C even if the car is off or is the adblue tank only heated if the car is running?