Mopar Deluxe Model 36 Heater Ducting Routing

[jwolf]

Have a Mopar Deluxe Model 36 Heater in a '49 B-1-D 126. Interested in how any venting or heater ducting would have been routed through the interior? All of the interior heater ducting was rotten beyond recognition when we pulled out the truck, so I don't have any reference. How much ducting ran under the dash and where did it go? Thanks for any help. Also if anyone has a schematic drawing of the heater parts, I'm looking for photos of any of the duct routing pieces, all we have is the heater box (though it works and is in great shape!)

[Los_Control]

2 minutes ago, jwolf said:

Interested in how any venting or heater ducting would have been routed through the interior?

The only ducting would be to the defrosters if your model 36 has a defrost option? Other then that it just sits under the dash and you have doors to open or close to direct the flow of air.

 

The heater was never installed at the factory, if you wanted a heater you either chose a model at the dealer and had them install it ... or you bought a heater yourself and installed it.

 

A really poor picture, I just painted it 15 minute ago and letting it dry. and it is hanging upside down.

My model 61 heater has a Y adapter on the side that has a cable operated flap on it.  I can connect two 1.5" defrost ducts to it and route them to the defrost vents under the windshield. .... that is the only duct work these old trucks would have. ...... My truck never had a heater in it so it never got the tin adapters under the dash to connect the hoses to the vents .... I will need to fab something up.

 

 

 

 

 

 

 

 

 

 

 

[jwolf]

Here’s a photo of the piece you’ll need to help with fabrication. 

[jwolf]

If anyone has good photos of the defroster diverted piece with a scale so that we could make CAD drawings, I think we’re going to try and fab one up, as extensive search has come up empty as far as finding one. 

[Los_Control]

Not really sure what scale would help. I do have a model 61 heater and is different then a model 36,

 

 

 

This is how the 61 looks. currently the flap is closed blocking heat to the defrost hoses .... so air blows to the floor.

 

Here is the flap open, it allows air to go through the ducts and blocks air from going to the floor.

 

 

Real simple operation. ..... close all the doors and open the defrost ducts .... or close defrost and open the doors for heat.

 

As far as size goes, you want to measure your hose size in the photo you posted. Mine measure 1-5/8" od.

Searching for defroster duct hose, I see 1-1/2" available? I'm hoping it will stretch over the 1-5/8" connections I have.

 

I figure if the model 36 did not come with the defroster option, you will need to fabricate from scratch. first figure out the pipe for the duct hose .... match what you have under the dash.

Then you will need to modify your case .... my Y is located in the upper left hand corner of the case pointing to the vents under the dash.

You need to figure out how much room you have and make it according to the size available. .... Then figure out your flapper for the door.

 

Why the only dimensions I'm including is for the hose, you just need to match what you already have then make something work .... while my flapper is fancy cable operated, a simple lever on the flap would work just as good.

 

But I will gladly provide measurements of anything you think you need.

[billrigsby]

 

This is for the Model 504, but may help with hose routing.

 

 

 

[Los_Control]

There is a older thread here on the model 36 and shows the defroster duct.

 

[Merle Coggins]

Defrost ducts look like this. Sorry, nothing to show scale. I never pulled them out of the cab for stand-alone pics. 

 

[ggdad1951]

On 11/29/2023 at 2:43 PM, jwolf said:

Have a Mopar Deluxe Model 36 Heater in a '49 B-1-D 126. Interested in how any venting or heater ducting would have been routed through the interior? All of the interior heater ducting was rotten beyond recognition when we pulled out the truck, so I don't have any reference. How much ducting ran under the dash and where did it go? Thanks for any help. Also if anyone has a schematic drawing of the heater parts, I'm looking for photos of any of the duct routing pieces, all we have is the heater box (though it works and is in great shape!)

Routing the ducting is just point to point under the dash as "tight" as you can.  My heater distro box has the two vent lines runing straight up so it is a direct line almost to the pass side and then up on over to the diver side.  I can get pics later if you still want to see.

[jwolf]

Any ideas on where to source vent hose that will fit the defroster ducts?

[Los_Control]

Just curious if you have measured yours? Mine measure 1-5/8 od .... Rock auto sells it .... probably many local parts stores also.

 

Seems like 1-1/2" is standard size ..... no idea if it will stretch over my 1-5/8" vents.

 

https://www.rockauto.com/en/tools/hoses/lines+&+clamps,defroster+hose,defroster+hose,308

 

[ggdad1951]

40 minutes ago, jwolf said:

Any ideas on where to source vent hose that will fit the defroster ducts?

 I used a "hose" with a plastic spriral support in it that allowed SOME stretch to go over the metal bits.  I believe (memory hazy) parts spec'd for Packards.

[billrigsby]

 

It is my understanding that THESE are as close to original that have been found,

a little pricey, but if it is a restoration.

 

[ggdad1951]

Here are some pics if they help.  Looks like I need to dust under the dash! 

 

passenger side over glove box

  

 

center under the cowl vent

 

looking towards the driver side

 

heater distro