[ShadeTek]

The smell may be caused by several issues. It may be a bacterial build-up in the evap coils, leaky heater radiator, leaky air-con evaporator, air filter needing replaced, the smell may also be coming from the seats or something else is has been dropped down the side of the chairs like carry-out food. Don't rule out rodent activity.

I bought a car once which had 4 air freshners in it. It was only when I removed them after complaints of the lemon aroma, that the reason why they were there in the first place. The seats STANK of sweaty arze. Cue ordering a set of black leather computer/memory controlled seats from the scrappy.