Ac heater box rebuild

[Shoooter]

yes that is it in sure. any pictures or know what hole it comes out of the firewall in? it doesn't seem like it is long enough to reach the passenger inner fender

[71GranCoupe]

yes that is it in sure. any pictures or know what hole it comes out of the firewall in? it doesn't seem like it is long enough to reach the passenger inner fender

Check out this thread.

https://forum.e-bodies.org/engine-transmission-and-rear-end/4/70-challenger-heater-control-valve-440-with-ac/4841/msg68322#msg68322

[Shoooter]

great info on that tread. that's the cable I'm talking about! I still can't see where it comes thought the fire wall though. also does the cable go through the mount that the steering coloum is mounted to or below?

[71GranCoupe]

There is a drain tube right under the blower motor and if memory serves me correctly, there is a spot where the cable comes through the firewall. On later years I think it was moved to exit out the driver side and run on the outer firewall and then to the water valve. Unable to locate pictures at the moment but will keep looking.   

[Shoooter]

found this. looks like it goes on the drivers side of the steering coloum.  the cable didn't look long enough to reach the passenger side. would there be a grommet in the firewall?

[71GranCoupe]

If you are working on a 71-74 the cable is routed through the firewall on the driver side as in your picture above and the one below. however, if a 70 it comes through the firewall next to the blower motor. Still looking for a pictures for the 70 application.

[Shoooter]

it's a 71 cuda I'm building. I wounder why the two pictures have different holes. maybe there from different years.

[71GranCoupe]

Most likely a revision from the designers/engineers. Updates were made all the time. The orange firewall is from Moparts and supposedly a 71 Cuda. Maybe a little research will firm up the correct hole for your application.

Here is a quick google search for 71 Challenger firewalls, both cuda and challys pictured.

https://www.google.com/search?rlz=1C1CHWA_enUS600US610&biw=1366&bih=588&tbm=isch&sa=1&ei=egsyWo_QAoLijwOlk7lY&q=1971+dodge+challenger+fire+wall&oq=1971+dodge+challenger+fire+wall&gs_l=psy-ab.12...281426.282267.0.284814.2.2.0.0.0.0.209.396.0j1j1.2.0....0...1c.1.64.psy-ab..0.0.0....0.ma0-P-_NhsU#imgrc=oPKjTGqXve7VxM:

[71GranCoupe]

FYI, The white pictured firewall you have shown above is from a 70 Challenger.

[Shoooter]

that's perfect. I'll check mine tomorrow.  thank you again. I'll be contacting you as I have more A.C. questions and I'm searching for parts as well.


do you think there is a grommet in that small hole?

[71GranCoupe]

I am better versed on 70's but will help in anyway I can, even though I have 2 71's with AC. Yes, to the grommet for the cable penetration. I  have seen them, but have no pictures. Without a grommet, it would slide in the bare hole, let in outside air, fumes and other unwanted issues.

[71GranCoupe]

As long as this has been brought up here is a picture of 1970 firewall cars with AC. You can see the grommet just to the right of the blower motor and down a few inches. It has 2 passages, one for the vacuum line and one for the temperature cable.

[cataclysm80]

The grey primer Challenger firewall pic is my car.
It's a 1970 early built car, and was originally equipped with the cable that passed through the firewall under the blower motor.

The orange firewall is a 1970 'Cuda that belonged to a guy called Snoopy.  I don't think his car originally had air conditioning, he labeled that picture to help other people.

The change to the cable that passed through the firewall by the brake booster is a bit of a mystery.
It happened during 1970 production, but it's not a simple change over on a certain date, both styles are found throughout the production year.

The cable is a different length depending on where it passes through the firewall.
The cable which passed through under the blower motor was longer than the other cable.  This cable has not been available anywhere for many years, so if you need a cable, you'll probably have to use the only style available, which passes through by the brake booster. 

The hole will already be there.
This cable passes through where one of the plastic insulation retainer pins would go.
The new cable will have the rubber grommet already on the cable.  The grommet is rubber and is shaped similar to an insulation retainer pin.

The 1971 and later cars all use the cable that passed through by the brake booster.

[cataclysm80]

Regarding why the two pictures have different holes, the only difference is what options each car has.
The Challenger has less holes because it's an automatic transmission.  It also has a cruise control wiring hole.
The 'Cuda is a manual transmission which is a few more holes, and it also has a fog light wiring hole.

[CudaHead]

http://www.hotrod.com/articles/1971-plymouth-cuda-gets-heater-ac-box-refreshed-restored/