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Hello All
I have a '50 3100 with a EA Deluxe Heater w/ defroster does anyone have any histroy on these? are they dealer installed or added later by someone else I haven't be able to find much information on these only one mention of one I found searching here.

THanks

Cletus1950,

Those heaters are discussed about twice a month. They were made by Harrison, which I think was a division of GM (Harrison also made the radiators).

The truck did not come from GM with a heater installed. All styles of heaters were accessories - this means they were installed by the dealer, or by an owner, or by a friend.

There were two styles of 47-55 Advance-Design "DeLuxe" (Air Flow or, or Fresh Air, or maybe Flow Control?) heaters, 1947-1952 and 1953-1955.

http://chevy.oldcarmanualproject.com/accessories/1951am/51aim36.htm

Excuse my ignorance.
What does EA stand for?

I am glad you asked.

http://www.thecj2apage.com/forums/a-tale-of-two-heaters_topic3264.html

Ah, a Redhead DeLuxe model DL 51, EA Laboratories, Brooklyn N.Y. USA

That is a non-GM accessory heater of a different color?

Please excuse my ignorance, too. A picture is worth a few thousand words.

Thanks, DADS50

Here is a piture of mine all the ones I had seen were different than this. Mine is square with a door on the front that exposes the core. It has EA Deluxe written vertically on the front

https://www.dropbox.com/s/vtrp4sotdf0c3gg/IMG_4457.JPG?dl=0

"E. A. Laboratories Inc - Makers of Aircraft, Automotive and Marine Appliances"
early aftermarket supplier of car & cycle accessories

Bill

They made a lot of horns (mechanical and electrical horns) in the teens and twenties.

What is this Heater it is from the 1951 Chevy Accessories Installation Manual it does not look like the round recirculating type.
It has more of a square box. Is this the same Heater
The article states it is a 1947-48 GM recirculator heater.

Recirculating type looks like the 1st two pictures in this THREAD.
It has more of a rounded box with a round heater core.

I thought General Motors offered from 47-55 1st series truck
A rounded box recirculating type heater with a round heater core.
And a fresh air/air flow HEATER semi-round box with a rectangular heater core.

Was there more than 2 types of heaters offered By GM?

I have seen numerous examples of this heater (here is an NOS example).
https://www.flickr.com/photos/advance-design_parts_co/15240469173/in/album-72157631868452754/
It does not meet the mounting example as it clearly has only two attachment studs, and no visible motor.
https://www.flickr.com/photos/advance-design_parts_co/15674350667/in/set-72157631868452754
The heater above and these are the only heaters appearing in the Salesman Data Books and the full-line sales folders (1947-55 1st).
https://www.flickr.com/photos/advance-design_parts_co/8129448404/in/set-72157631868452754
I have no photo reference for this heater nor have I seen one. I will be curious to see if someone has a photo of it and any corresponding hardware.

That heater in the 1951 Accessory Installation Manual is an oddity (enigma)? (part number 986544)

It is not shown or referred-to in the 1951 Truck Data Book (October 15 1950), which shows the:

1. "Outside-Air Ventilator, Heater and Defroster"
which is also referred-to as the "Fresh Air Heater"
but it is listed in the Price Information booklet as "Heater, Airflow and Defroster" for $59 (January 10th 1951)

Just to further confuse, the CHEVROLET ACCESSORIES for 1951 PRICE LIST of November 15 1950 contains:
"Heater and Defroster - Air Flow" $59.00 (part number 986104 - same number as listed in the Installation Manual)

2. "Dash Recirculating Heater and Defroster"
which is also referred-to as the "Recirculating Heater"
but is listed in the Price Information booklet as "Heater, Dash-Type De Luxe w/Defroster" for $35.50 (January 10th 1951)

Just to further confuse, the CHEVROLET ACCESSORIES for 1951 PRICE LIST of November 15 1950 contains:
"Heater and Defroster - Recirculating" for $35.90 (part number 986248 - no shown in the Installation Manual)

So to summarize, from 1947-55 there were 4 Accessory truck heaters that were offered by the GM dealers.
(1) Recirculating box type, Years ?
(2) Recirculating round type 1947-55 1st series
(3) Air flow 1947-52 (no doors)
(4) Air Flow 1953-55 1st series (with doors)

(5) ? Drawing only, Mr.Oddity Years ?

Just had a brain wave, would the COVER from the Air Flow heater with doors fit on the Air Flow heater without doors.
If it did fit, you would be able to use two cables.
One cable to operate Defrost/Floor damper.
One cable to operate Fresh Air/Recirculating doors.
You would kinda have a hybrid heater.

The cable support bracket on the left would have to share both cables.
And you would have to find room next to the existing under dash Cable Knob (54 dash shown)

This is my experience in helping date the heaters as you have them detailed with some clarifications.
1. This is a carry over heater used in cars trucks back to at least 1941 and perhaps earlier. It is common on Chevrolet and GMC trucks 1947-48 as stock was consumed. This heater appears in my 1947 and 1948 (just has drop in updates) Salesman data books. the GMC/Chevrolet versions carry a unique identifier plate on the front for each make.
2. There are at least two versions of this heater in trucks (a modified version was available in cars with a shroud as shown).
https://www.flickr.com/photos/advance-design_parts_co/8129344483/in/set-72157631868452754
early version 1947-some 50's comes with an aluminum plaque and has corresponding slots for it to fit into. My 1950 3600 (original owner) was equipped with a plaque recirculating heater. I have owned six other 50's and it was a mix of the two.
https://www.flickr.com/photos/advance-design_parts_co/8129304429/in/set-72157631868452754
The later version comes with a decal (no holes)some 50's through 55 1st (color changes apply for certain years and GMC/Chevrolet).
https://www.flickr.com/photos/advance-design_parts_co/8129330842/in/set-72157631868452754
3. As described except the early versions as described above are punched for a plaque, sometime in 1950 this changed to a decal? All of the 47-55 1st heaters were accessories except the 1947 version of the Air Flow which in the 47-48 Salesman Data Books has an R.P.O. option number (I am traveling so do not have ready access to list it).
4. As described, there are color differences and these heaters all have decals.
As I stated earlier I have never seen the "oddball" mentioned in the previous posts but would love to if someone has one.

The 1947 Chevrolet Truck Specifications manual (10-1-1947) shows at least one heater as an RPO for some models
(the chart instructions are as clear as mud):
Heater & defroster (fresh air) - RPO 385B (for at least some models?)
https://dl.dropboxusercontent.com/u/30524403/1947-Chevrolet-Truck%20RPOs.pdf

The Truck Data Books indicates this heater is available on all models of trucks (this is the "deluxe" Fresh-Air Ventilator, Heater and Defroster).

That same 1947 Truck Specifications manual also shows three model numbers for "Heater".
Part Numbers ("UNIT IDENTIFICATION") and names:
986101 Heater Car (Deluxe)
986104 Heater And defroster (with fresh air inlet)
986102 Heater Blower defroster
https://dl.dropboxusercontent.com/u/30524403/1947-Chevrolet-Truck%20accessories.pdf

A 9-15-1947 Accessories Parts List shows 5 heaters, but it is not clear which are available only for car or truck (or, available for both).

986104 is listed as: Heater & Defroster - Fresh Air 1947 Truck
986101 Heater Dash-Type is listed but car/truck is not specified

The Truck Data Book shows a " Heater and Defroster, De Luxe" that is completely different from GM Advance-Design other heaters (no part number is given). It has two electric switches to independently regulate heater and defroster motors.

The EA Deluxe Heater w/ defroster referred-to in the original post, made by EA Laboratories, Brooklyn N.Y. USA, would have been a non-GM accessory heater (installed by dealer, owner, shop, friend)

You Two Guys are a,

Thanks,

Hope the information is useful to all, thanks.

http://devestechnet.com/Home/HeaterRestore

Like this one?