What your seeing is the cars radio antenna. Your defroster is on your back window.
rear defroster
Yes they have a heater/defroster.
Check that the wire on the rear defroster is connected to the defroster. If broken off repair it.
you have to make sure there is no short and check for voltage amount at the strips of the window to make sure defroster is working
Yes, in fact in most modern cars the AC automatically comes on with the Defroster.
you either have a blowed fuse or a wire crossed
starting pay for working on cars
most likely your air conditioner needs recharged per my mechanic brother-in-law
The ac unit compressor will run when it is in defroster mode and heat setting is on.
fast and convenient I use it to get around my car is my friend a rear defroster hubcaps and windshield wipers aspects of my car
Yes, they were working on steam cars in the late 1700s.