A/C to Heat ONLY conversion on 68 Dart Sports Special

I would recommend just using the a/c hevac unit and not hooking up the evaporator...

In addition to the fit issues with the firewall, the wiring harness is different for the heater only vs the A/C car and you need to know your way around electrical wiring to get it right...

We were going to go heater only from a/c in our 71 valiant and ordered the new inside wiring harness for heater only, and then realized it would be better to just keep the a/c hevac unit and not hook up the evaporator... I had to adapt the old a/c and heater wiring to the new harness that was wired for heater only... I found a few tricks to get it to work, but it took me a while to figure it out...