Windshield defrosters are a federal requirement. You can't get a streetable vehicle without it.

I think the previous couple of posts were referring to REAR window defrost...which is electric.

As for the 2nd button from the right...yeah the manual says that some air goes to the windshield, but the Fiero does not have a separately operated a/c control so that air will not be a/c i.e. dehumidified, to it's not going to help much in clearing the windshield.

I at least fixed that on my car in that I added a separately operated A/C control so I can get a/c air coming out of the heater and defrost vents at the same time.

I sometimes close the center console vents, aim the side vents at the side windows & switch between vent and defrost as needed to keep the side windows & windshield clear.

This was my first information post and I think it's cool that there is so much interest! i drove in 0 temp yesterday just because I'm bored out of my mind recouping from surgery, What I found is, way more heat in the cabin on vent with fan on low. It actually cooked me out. My left foot got a bit cold. Now if I went to heat I had to put blower on 3/4 just fo stay mildly warm. I hear all the flappers working but can't even tell you where the (heat) is coming from. Vent good, heat bad, defrost fair.

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( Create a team, analyze, make a plan, then ask the wife if it's OK.)