My GMC's heater/defrost seem normal to me, because the heater in my Festiva and my previous cars was also kinda slow. I have noticed that fog won't leave the rear window and the backs of the door windows unless you have been driving for a while or the sun hits them. However, other than that, they are good and work fine for down to - temps.
A screen sure would be a great idea, I'm tired of the leaf collage coming out the ducts every time I open them.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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