Heater and A/C

I installed this, which replaced my old worn out heater with both heat & AC.

http://www.vintageair.com/download/pdf_singles/42.pdf

suki243 said:

But I was wondering, if i'm planning on getting an A/C installed as well should I get a different heater repair kit?

When you install the a/c are the controls the same as the heater? and do all a/c kits come with the under the dash register? Is the under the dash register a unit on its own (independent of hte condensor etc...) cause I've seen it and it looks like an entire cooler itself.

Click to expand...

The underdash units are independent of the heater box/core/etc. If that's what you're going to get in the future, then non-A/C heater parts will do. Just think, my car has factory in-dash air. It's going to be twice of a job to replace the core.

I dunno, though, I would just get a heater core first. Should be about $25-40 through a major parts store and most likely they'll have to order it.

For the "original" appearing AC (evaporator is under the dash) simply rebuild your current heater box, you can use any of the Mustang supplier's kits (NPD, Mustang Plus, etc). Just be sure to replace the core at the same time. If your '66 did not come with AC, you might want to use one of the aftermarket sets which combines the AC and heater into one unit and mounts it under the dash where your current heater unit sits. You will lose some glove box area. Classic Auto Air sells a "daily Driver" or the "Perfect Fit" unit. These same systems are sold by Mustangs Plus and NPD. The Daily Driver version mounts the evaporator under the dash as the original unit. With these units, if you didn't have AC originally, you will have to cut a hole in the firewall for the hoses. If you go for the "perfect fit" unit, it runs all the hoses out of the hole in the firewall where the heater motor used to be. One advantage of these kits, you can get them with a Sanden compressor, which is lighter and more efficient. Cost is just about the same for either system

I believe both the heater and AC hoses with the aftermarket unit come out through the bigger hole where your heater motor sticks through the firewall. Those holes you have now with the current heater hoses will need to be pluged/closed off.

We have the Perfect fit kit for our '65, but have not installed it yet The "Perfect Fit" conversion by Classic Air, provides plugs for the two holes where the current heater hoses go. You will have to modify one of the plugs provided, to allow a control cable to go thru to a valve in the heater hose, provided in the kit. This kit also includes a new plastic glovebox, which is much shallower than your current one ~ 4 inchs deep. You will not be able to put much in the glovebox after the installation. All 4 connections (AC and Heater) exit tlhru the larger hole where your heater blower motor is currently located (next to the heater hoses), just out of site in the photo. I assume your vehicle does NOT have factory air. If it does, you will have to make a cover for where your current AC lines go thru the firewall.