What's worse is when it's in your car, you can look at it, touch it, turn the knobs but it hasn't worked in over 20 years. I guess a Vintage Air unit will go in one day; might even rip out the heater core and seal the air vent whilst I'm at it.
Lucky the Z's have the two air ducts that don't trap rubbish (in the cowl), rust out the top of the firewall, drip into your cabin and rust out the floor, make you swear whilst lying upside down ...