Heater Box... inlet?

[OUTFXD]

With the rainy season comes fogged up windows.  And on that note,  Jacquilines defroster works marginly at best.

 

I crawled under the dash to make sure all the hoses where attached and I notes I sizable hole in the bottom of the Heater box (the stamped kind,  not the cancer kind).

 

My first impulse was to partially cover it up to promote airflow to the Defrosters and I got to thinking, Odd I know.

 

What if this hole was not an exhaust vent as I assumed but an intake.  Limiting incoming air could be detrimental and would definitely have the opposite effect of what I was trying to accomplish.

 

So... Here is a picture, what is it?

[Sniper]

I'd imagine it is an intake as well.  Turn the fan on and use a piece of paper to see.

 

When heaters don't, I usually flush them with a garden hose, flow bot ways till it runs clear.  Then they heat.

[OUTFXD]

Heat is.... okay.  Just not getting airflow.Taped up the hose connections to the defroster and that seems to have helped.

 

Will probably get some hoseclamps to hold them in place (currently none present).

 

 

[capt den]

the motor may not be turning at full speed due to age or othe rissues. i got mine rebuilt and it made a difference.    capt den

[YukonJack]

The opening on the bottom is the air intake. Plymouth didn't start using fresh air intake until 1950 I believe, unless you had the dual heater option which got fresh air from the cowl vent. Defrosters never work very good on the P15's. I think Rain-X makes a product you put on the inside of the windshield to prevent fogging. 

[Dan Hiebert]

On D24s there are plugs in the windshield's interior garnish on each side of the defroster vents.  I don't know if P15s have the same setup, but it could be worth checking.  They serve to channel airflow from the heater unit to the vents.  If those are deteriorated too much, or missing, you won't get good airflow to the defroster vents. 

[SteveR]

I think on my 37 Plymouth they must have changed the heater as I no longer have any way to get ventilation to the windshield. I just open the windshield up a little and that clears it. I don't know if you have that option on D24s.

[Marcel Backs]

by the amount of rust built up on the inside of the heater box and the fan blade, it is probably time to pull the unit appart. Hammertone paint is widely available and easy to apply on the heater box. Clean all moving parts making sure the motor bushing has a bit (a drop) of 3 in 1 oil applied. Check frayed wiring to the heater and replace accordingly. Your heater probably slowed down a bit with age like I have. M

[OUTFXD]

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4 hours ago, Marcel Backs said:

by the amount of rust built up on the inside of the heater box and the fan blade

 

The whole car has a decent build up of rust, I am cleaning and repainting as fast as I can!  

 

However some things must take priority.  Getting the exhaust manifold/system squared away so the car will run proper beats out fixing the heater so I am a bit more comfortable.

 

Not criticizing your post, Just making a statement.

[OUTFXD]

The heater hoses are in bad shape.  they fit loosely over the fittings and fall off if left to their own devices,  the cloth is so brittle that any attempt to clamp them in place just dusts the cloth.

 

Something else for the "later" pile then.