Henry's 70 Dart Swinger

Mine had an aftermarket AC installed at the dealer. It had been hacked on and didn't work. I pulled it all out and it's nice to be able to work on things with some room. They had the AC hoses on mine entering the firewall on an angled up panel between the master cylinder and the wiper motor. Water ran down the firewall and right into the slightly upfacing holes. I found plugs at Ace Hardware that fit and sealed them with a dash of clear silicone around the inner lip. The drain holes are in the trans hump up under the dash. Two of them. I sealed them with shortened rubber stoppers from Ace with a little weather seal cement to hold them snug. The carpet covers them up and you can't see the holes in the carpet.

When you work on that dash I really recommend taking the seats out and laying thick foam down. You'll be so comfortable that you might even take a nap. The underside of the dash is easy to work on with the underdash AC unit gone. Also take out the glovebox and the instrument cluster and you can really clean things up under there and fix all your wiring woes. I took that time to replace my wiper shaft to cowl seals and reattached the underdash jute. I pulled the heater box and cleaned out 42 years of leaves and pine needles and bug remains. I added instruments in the dash and a stereo. It's my daily driver so I wanted it functional. I also painted the dash at that time to freshen it up. There had been only a little messing with the wires because an old lady owned it for most of it's life but it gave me a chance to clean things up and reattach wiring to retainers and such. Took me about a month after work and weekends but it was worth it.

If you pick up the factory manual on CD it will really help. Print out the pages you need and toss them if they get greasy. The wiring diagrams are very helpful and it's fun to learn the wiring. It's like a puzzle for the mind to track, trace and correct the wiring.