I got a bunch of old heaters when I got my 51 3100.
Can anyone tell me what heater I have installed? I'm assuming it's a recirculating heater? The blower has a switch under the dash and there is knob on the heater to direct flow. I also have a valve on the side of my thermostat. Is that to let coolant into the heater core?
What are the two other heaters I have? I think one is the fresh air heater, but not sure about the other fan?
If look at the assembly manual, there are a bunch of holes on the firewall for "Heater LD". Is that the fresh air heater? I'm going to use a bunch of stainless bolts and fender washers to seal them up, but what do people do about the big oval in the firewall? My floor is rust free, I'd like to keep it that way...
Thanks for all the info Brad. If the truck came with a recirculating heater was there a plate to cover all the access holes for the air-flow heater? Are they available or am I on my own to make one?
If a truck had the air flow heater, did that suck in water through the passenger side vent?
The bottom front of my cowl under the vent is solid, but there is trash in there I have to clean out before any water can sit in there for long.
On the firewall/Dash there was only a round plate to cover the fan motor hole. Brad's Photo
The other holes for the heater, the (oval Ranco temp control hole) and the (heater core hoses holes) were apparently covered by the Inner Firewall Cover/Pad at classicparts.com There were never any plates for those holes. The heaters were not installed at the factory when the trucks were being assembled. Heaters were considered a accessory and installed buy the dealer or by the owner of the truck..
According to the air flow heater installation manual you had to cut holes into the Inner Firewall Cover/Pad insulation.. Page 1 read # 2 Page 2 finish reading # 2, then read # 6. Air flow heater installation Drawing.
Once the holes in the pad were cut you have to ether replace the Inner Firewall Cover/Pad or figure out anther way to cover the holes
The heaters were not installed at the factory when the trucks were being assembled. Heaters were considered a accessory and installed buy the dealer or by the owner of the truck.. Accept for years 1947/48 there was a factory supplied Regular Production Option RPO 385 Fresh-Air Ventilator, Heater and Defroster.
All of the heater hose holes were originally covered by a stick-on firewall sound deadening/heat deterrent pad on the inside of the cab. It did not deaden much sound, nor deter much heat, but one thing that it did do was stay in place. Nuclear adhesive. Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
Are there any plates to cover up that huge oval hole?
I notice the oval hole has small bolt holes above and below it. Make a sheet metal rectangle to cover the oval and use the small holes to bolt it on. Paint to match the firewall and it will look factory.
There is a picture of a light colored cab in the Factory Repair Manual which shows that all unused holes in the cab were black. It is actually the adhesive side of the glued-on sound deadening/ heat resisting material on the inside of the cab for the most part. I am not getting all preachy about originality, I am just sharing what I have seen. These are y'all's trucks. They are the coolest looking trucks out there no matter these trivial details. Carl
Last edited by 52Carl; 06/11/20191:20 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
If the truck came with a recirculating heater was there a plate to cover all the access holes for the air-flow heater? Are they available or am I on my own to make one?
