Do we have one??? If so, where... and how to change it.
Most cabin air filters are installed exactly for that reason. If they are not changed, they will screw up your heater and AC core, and degrade efficiency.If it's involved, it probably means PIA. I may be tempted to not replace it when it would come time to R&R. Pull it and chuck it, button'er back up.
For me, a cabin air filter is most important in the winter for airborn road salt dust. And in my ownership, my Spider will never be exposed to winter driving.
ps- hold on... I suppose the filter is placed upstream of the heating/cooling coils, eh? Argh. Well, you want to keep those clean. Actually, that's an hvac system air filter's first duty, to keep heat exchangers clean. Noses and lungs are far secondary.