Under-Dash Air Conditioning Components

[CACWBY]

Good Luck getting any needed replacement parts, like switches, etc.
The newer compressors and under dash universal units cost more but IMO they are better, and can accept new refrigrant. Not to say a good mechanic can't make the old stuff work...

[MAK]

Held the one in the first pic up under the dash and it seems like it will mount under the dash with no problem since it's flat across the top and would stop before it got all the way over to the contoured drop on the driver side. Unfortunately, like has been pointed out, it's probably more trouble than it's worth by the time I deal with all the issues and parts like condensor I would still need.

What has to be done to these old systems to convert to the new R134 refrigerant?

How do you handle heating if one of these is installed? Does the old heater core remain or what?

Thanks for the help.