I'm looking for the return air intake. I need to spray some Wurth A/C & Heating System Treatment into it. Does anybody know where it is on the Z? On the directions it states to look under the passanger side, but I cannot seem to find anything under that looks like a vent. The only thing I see are the vents where the air comes out from when you set it to come out from the bottom.

Did not know if this was the right section.

 

generally, when you have the vent or floor vents on.. the air (when in recirc mode anyways) is returned via the defroster on the dash.. not sure about normal mode..

 

Have not checked but on almost every car it is btween hood and windshield