Heater Motor

[meadowbrook]

Greeting folks.

 

Are the heater motors on these old Mopars (1950 D34 in particular) pretty weak as far as air flow?

 

Mine is located just behind the grille and while it does work, it sure doesn't blow that forcefully.

 

Mind you, the heater core puts out a lot of heat, and it heats the interior pretty well as I drive down the road.

 

Just wondering. I will likely power it directly to see if it's just a matter of old connections or worn brushes.

[greg g]

There is a far piece of territory that between the fan and the cabin, but that said air flow is air flow.  I would think the meager flow in the cabin is more likely the result of air leaks out of the system at seams and junctions or some blockages, rather than the weakess of the fan, assuming the motor is running at proper speed.  Does it respond properly to the fan speed switch.  Is it getting its full voltage through the switch to the motor.  Most heater switches work i resistance with higher resistance at the switch leading to lower voltage at the motor to control speed.  Fan should be getting the full 6 V on the high setting.      

[Niel Hoback]

  My son had that problem with a 65 wildcat. It seems the local rodents had stuffed the heater ducts with Wendy's napkins stolen from the glove box.  Check for blockages, its worth a shot.

[48mirage]

I had a number of holes in my duct work.  That asphalt coated paper didn't have a lot of strength.  What I did was to pull the duct work cleaned it up (brushed it off with a wire brush) and then fiberglassed the duct.  I did 2 sides at a time as had it done in a couple of days.  Sanded off the rough edges and spray painted it black.

 

That was nearly 10 years a go and it still looks good.  I did have to replace the fan and found one that fit with minor modifications only problem was it was 12 volt.  I worked around that since I am running dual voltage (6 volt and 12 volt negative ground).

[Grdpa's 50 Dodge]

My guess is a door isnt opening on cue OR heater core is plugged on outside

[DJ194950]

In 1950 Mopar had at least three diff. heaters. Per my repairs manuel a 100- a 300- and a 550. slightly diif problems Could be Your problem. 1 speed blower?  2sp. blower? Separate blower for defrost..

Some did not have the fresh air flap with a lever to open/close .

I'd agree most likely block in the heater core box or duct/ducts inany of the models.

They really don't blow the cfm of your modern car. Mine was tottally replaced-all new/repaired even on high.

 

Check/clean/enjoy.

 

Best,

 

Doug

[OldDad67]

Greeting folks.

 

Are the heater motors on these old Mopars (1950 D34 in particular) pretty weak as far as air flow?

 

Mine is located just behind the grille and while it does work, it sure doesn't blow that forcefully.

 

Mind you, the heater core puts out a lot of heat, and it heats the interior pretty well as I drive down the road.

 

Just wondering. I will likely power it directly to see if it's just a matter of old connections or worn brushes.

Most of these old stock motors need a good shot of oil, sometimes you can drill a very small hole in the back of the motor over the rear bearing and put a few drops of very light oil such as 3in1 oil. Then oil the front shaft where it comes out of the housing. This will save you from having to split the motor in half. It doesn't always work, but most of the time your motor will like you for your efforts. Very seldom do you see bad brushes. Just my two cents........