Heater control cable 1972 GTX

[Robliepse]

Working on the heater control on my 1972 GTX with factory air. My 1972 340 RR with factory air had the heater valve located on the heater hose under the hood. The car I just bough a few weeks ago doesn't have this valve is I assumed that someone over the past 42 years removed it. However, I looked in the service manual this morning and noticed a reference that the heater valve is located under the dash. I found replacement cables on line at Jimsautoparts.com but he references the valve being placed in the engine compartment. I have verified that the cable is completely missing from the control side but I have not looked for the valve under the dash.

Can anyone verify where the valve should be on the 1972 Roadrunner GTX?

Does anyone know a good source for the cable and all the clips?

Thanks

 

[challenger6pak]

Do an internet photo search for your 72 and see what is under the hoods. My 71 Charger had it under the hood and they are the same generation of cars. Look halfway down the page at this 72 Charger.

http://www.forbbodiesonly.com/moparforum/showthread.php?70105-72-Dodge-Charger-Hard-top-Project

 

[SureGrip]

I'm pretty sure all B-bodies have the control valve in the engine compartment.

I think the C-body cars could have them under the dash due to a different option for Heat/AC.

 

[Robliepse]

Thanks SureGrip, that was always my thought too but there aren't any holes in the firewall to hold the bracket. Hummmmmm, got to figure something out cause that hot air is killing me.

 

[old_skool]

Thanks SureGrip, that was always my thought too but there aren't any holes in the firewall to hold the bracket. Hummmmmm, got to figure something out cause that hot air is killing me.

ok, let me try and help you out here, we have the same year b-body, and I'll bet dollars to doughnuts the setup is the same, I have an Ac car as well. is your dash the rallye style or regular long speedo?, regular style has the heater/AC control on the lower left side of the dash, and the cable control feeds through the firewall adjacent to the emergency bracket up the firewall from your foot control high beam switch, comes out next to the master cylinder power booster and runs along the firewall behind the engine to the passenger side, then follows the heater hoses half way along the inner fender. That's where the heater control valve is mounted, 2 hose in, 2 hoses out cable controls the valve allowing the fluid to either return to the engine without going to the heater core or continue to it. I have an oem heater control valve, I'll get you a picture of it today.


And the only difference with a rallye style dash would probably be the firewall entrance and possibly the length of cable.

 

[Robliepse]

Thanks old_skool, that's the exact set-up my that was on my 340 Roadrunner so I'll have to find a control valve and a cable. Do you know where the AC control vacuum hose should exit the firewall? I have the service manual and it appears the black hose with the check valve goes to the engine but mine disappears over the AC unit under the dash and it appears to never reappear.

 

[old_skool]

Thanks old_skool, that's the exact set-up my that was on my 340 Roadrunner so I'll have to find a control valve and a cable. Do you know where the AC control vacuum hose should exit the firewall? I have the service manual and it appears the black hose with the check valve goes to the engine but mine disappears over the AC unit under the dash and it appears to never reappear.

I'll re-look at my engine compartment when I get pics of the heater control valve, but if memory serves me, the AC vacuum exit/enters the firewall on the passenger side somewhere close to and just below the heater blower motor.
I believe this is the vacuum that controls all the various vent settings to open/close

 

[Robliepse]

Thanks, I found and bought a NOS control cable on E Bay and an aftermarket control valve from AutoZone. Yes, after market AutoZone valve because I want to get everything working and road tested, have some fun and then decide if I'm going to wait for the budget to go all in and bring it to the next level. My only concern now is that I might not have the required clips to hold the cable on both ends. I remember I had a similar issue on my old RR. Please send me an up close picture of the vale's mounting location and clips.

Thanks again,

This site rocks

 

[old_skool]

Sorry I haven't gotten pics yet, been pouring down with rain and my car is parked outside under a tarp, I also went with an aftermarket valve as my oem was leaking. I'll get them as soon as I can.

 

[old_skool]

Still haven't forgotten you yet, we had several tornado warnings last night, had to setup a second pump to prevent my septic from backing up, we had an actual touch down not far from here, was only approx 100 yards in diameter, be we had severe rain lightning and hail, car is still under covers, as were getting more storms tonight tomorrow and the next 6 days, I was actually working in the trunk area today in between all the weather, but the front of the car is buttoned down pretty good. I have some firewall rust and don't want the water to get into the newly laid carpet.

 

[Robliepse]

Holy cow Old_Skool, stay safe and hunker down in the basement with a 6 pack

 

[old_skool]

So sorry it's been so long, here are a few pics, disregard where mine is, mine is aftermarket and it's currently mounted wherever, the holes depicted with the red arrow I believe are the original holes for the valve, and align with the oem one I still have.

 

[sleepar]

On the cars with ac it's under the dash.... mopar had a dual heater core system that was supposed to heat the air before it got cooled to act as a dryer... and they rusted out the floor and the complex system usually got a valve under the hood to by pass the system... classic auto air is your best friend here... my coronet has the air temp system which was a dealer installation and both heat control valves are in the dash or heater box. One for heater heat and one that opens one or both heater cores... every confusing system...

 

[old_skool]

Mine is an AC car, must of had it installed in the wrong place by the PO

 

[72RoadrunnerGTX]

 

[old_skool]

THAT...is the exact one I have that's been removed, and from the exact spot that one is located...mystery solved.

 

[Robliepse]

Thanks,
II bought one from AutoZone but it didnt fit right so I found an original mounting bracket and going to find an original.

 

[idrivemopar]

Classic Auto Air in Florida sells the correct valves.

 

[Robliepse]

That is one beautiful blue engine compartment. I hope my 1972 GTX grows up to be just like yours. You must have been feeding it right in it's younger years.

 

[72RoadrunnerGTX]

Thanks, but unfortunately, previous owners did not feed it right, full resto was in order.
Before;

After;