I Bought a 72 Riviera about a yr ago and it has the rear "deffoger" I think it would be called. It actually has a blower and vents in the large rear package tray instead of the heated glass with the wires in it. I have a 72 Sedan Deville with the same setup. I suspect it is not nearly as effective as the heated glass type. My Riviera also has power windows, locks, tilt wheel, road wheels, electric trunk release, cruise control and AC. It is a pretty typically optioned Riviera. I like the climate control when it works. The unit on my 72 Electra worked great, the one on my 65 Eldorado didn't work at all and they are very difficult and expensive to diagnose and repair Speaking of options. I recently bought a 2003 Impala LS with heated seats. I can honestly say it is one of the most valuable options on a car I have seen since power windows. It will heat up your tush well before the car starts blowing heat out the vents. I LOVE IT!