Here in VA, one of the items for a State inspection is that warm air from the defroster vents has to blow on the windshield. Not just while driving, but when vehicle is stationary. A JC Whitney 12v auxiliary heater (powered by cigar lighter plug, and sits on the dash) is not good enough. Tried that in an old VW Beetle. No bueno.
Went to pay, started it up . . . defroster blowing high...mechanic came to see, "How did you do that! We tried everything!" So he signed off on safety. Went to leave, blower shut off
Drove straight to e test as engine light was off . . passed with flying colors . . . pulling out of parking lot, engine light came on
All stuff I can fix in good time...
Thanks to everybody here for the help and encouragement, special thanks to Turtle for the extremely detailed info