Temp Cable for heater valve control

[Olacmot]

Does anyone have pictures of how the temp cable goes from the heater control slider in the dash to the valve under the hood? I guess I am assuming that’s how temp is controlled. My car didn’t have the cable, and I didn’t see a good diagram in the manual. I have a four seasons aftermarket valve that I manually change under the hood to control coolant through the heater core. The car has factory AC.

I bought this cable a while back and it seems the ear that mounts it to the dash is the opposite orientation of how I’d think it should go. The picture with the screw installed is how it lines up best, but the ear seems upside down.

Also, how long should it be? I have a 1971 challenger and this cable is 48” long. I think it is supposed to go through the firewall on the drivers side, but that path means this cable is too short.

Thanks!

 

[tonysrt]

On non AC cars the cable moves a door to block heat from the heater core. That cable you have is hooked up to the door to block heat from the heater core and is hooked up on the top of the heater box. So I don't think it'll do what you want with an AC water valve. Check to see if they list it for AC cars or non AC cars.

 

[sixpactogo]

You have the cable for Non AC. You need this one.
https://www.ebay.com/itm/404807841338?_


By the way. That keeper in your last picture, goes on top of the cable eye not under it.

 

[Olacmot]

You have the cable for Non AC. You need this one.
https://www.ebay.com/itm/404807841338?_


By the way. That keeper in your last picture, goes on top of the cable eye not under it.

Thanks, just ordered it!!

 

[EV2RTSE]

As far as routing the cable, at first they ran them out the driver's side (first pic) but by mid-late 70 they started running them out below the blower motor (second pic).

 

[Olacmot]

As far as routing the cable, at first they ran them out the driver's side (first pic) but by mid-late 70 they started running them out below the blower motor (second pic).

View attachment 128464

View attachment 128465

Interesting. That spot below the blower motor is where my vacuum tube for the AC was routed. Did they start bringing the vacuum tube out the drivers side holes? Wondering if mine is switched…

 

[EV2RTSE]

No they shared the same spot, here's the grommet.

 

[Olacmot]

No they shared the same spot, here's the grommet.

View attachment 128475

View attachment 128476

Interesting. I don’t remember my grommet having the second hole, or that part that sticks out. Could have been changed over the years I suppose.

So, what’s the preferred path? My car is far from original so I don’t care. I kind of like the idea of keeping it behind the dash and out of the engine bay for most of the run.

 

[EV2RTSE]

Ya know, I think I may have gotten it backwards. I know on my car March 70 built car above it definitely exited by the blower motor but I'm thinking for 71-74 they may have exited by the booster. Hopefully others can confirm.

 

[tonysrt]

I have a non AC car and put a 3/8 ball valve on the water pump to keep the hot water from going into the heater core. Shut off in the summer and open it in the winter.

 

[Challenger RTA]

I'll draw a quick picture.

 

[Challenger RTA]

I have a non AC car and put a 3/8 ball valve on the water pump to keep the hot water from going into the heater core. Shut off in the summer and open it in the winter.

There should be a bleeder hole or crack it open now and then. The engineers put one there for a reason.

 

[Olacmot]

I'll draw a quick picture.
View attachment 128486

I appreciate you drawing this just for me

 

[MoparCarGuy]

Does anyone have pictures of how the temp cable goes from the heater control slider in the dash to the valve under the hood? I guess I am assuming that’s how temp is controlled. My car didn’t have the cable, and I didn’t see a good diagram in the manual. I have a four seasons aftermarket valve that I manually change under the hood to control coolant through the heater core. The car has factory AC.

I bought this cable a while back and it seems the ear that mounts it to the dash is the opposite orientation of how I’d think it should go. The picture with the screw installed is how it lines up best, but the ear seems upside down.

Also, how long should it be? I have a 1971 challenger and this cable is 48” long. I think it is supposed to go through the firewall on the drivers side, but that path means this cable is too short.

Thanks!

Yes, the second cable you ordered for an A/C car is correct and it is 71" long. The first one (pic below) you ordered is 48" and non-A/C.

The description for HEAT in the Plymouth Service Manual notes the vacuum-control of the "fresh air-recirculating door" to supply air through the heater core. It also notes the amount of heat using the temp cable you are replacing and the "setting of the water flow control valve lever".

Diagram showing the water flow control valve to HVAC control panel annotated for cable length of 71".

And the routing, as noted by @EV2RTSE, changed from exiting the interior on the driver's side (early-70) to exiting on the passenger's side (mid- to late-70).
Here is the Early-70 routing of the cable (LEFT) and the mid-year change routing location in the rubber grommet with the vacuum tubing (RIGHT).

 

[Olacmot]

Interesting, thanks for the info. Mine was built in August of ‘70. I think I am going to route it from the drivers side, as my grommet only has one hole in it and there is an abandoned aftermarket wire sticking out of the firewall that I need to remove anyway. If anyone ever sees my car in the wild and points out that this route is period incorrect, I will buy them a beer

 

[MoparCarGuy]

Those pics, especially your grommet, show you plan is accurate. Touche'!