Just general comments really, I fussed about this when I had my 2000 VW Passat 4Motion and at that time, maybe round about 2005, the "AC bombs" seemed to have a long tube and that needed feeding into the air plenum box - but I didn't actually complete that task! By the time that I got round to re-visiting that task with later cars, all the "AC bombs" had done away with the long tube, and the plan was now to just start up the car with all windows closed, turn on the AC on recirc, place the bomb on the floor in the rear of the car, and set it off, close doors and leave the car for a certain length of time, then open the door, switch off the engine and remove the now empty bomb container - job complete. I've used that method but removed the pollen filer first then closed the pollen filter cover, and fitted a new Frecious pollen filter after running that AC bomb. Edit:- sorry that I didn't answer your question exactly, but in all these cars the AC evaporator is inside the cabin heater box, along with and beside, the heater matrix. So, that is a closed mainly plastic box and getting into that area in a way that allows full access to the evaporator - will be a very big job, so all you can try is to use one or two of these "AC bombs" and that should kill the bugs and most of the smell.