Alright, I have a challenge for you all! I need to find a source for a 12 volt reversible blower motor. What I mean by this is that it has 4 wires coming out of the case and that it can be reversed at the switch. I have one, but cannot seem to find anyone who sells them. The numbers on the bottom of the case are 12v 508 586 0FT M-846. Any help locating will be much appreciated.
Drop on over to your favorite auto parts store and tell them you would like to buy a 12v blower motor for your heater
If you ask to see their Siemens Automotive Catalog and you should be able to find one that suits your needs. The catalog has pictures in it for comparison. I think I paid about $30-40 for mine.
I don't think you'll find a reversible motor though. I am not sure why you'd want to reverse a squirrel-cage fan anyway.... (but since it's a DC motor just swapping the +/- leads will reverse it.....)........Well, evidently not. I went out and tried it on my old motor................turned the same way regardless of how it was hooked up!!
the 41-48 ford car heaters had reversible motors, they would spin forward to push air out of the core, and spin backwards to pull hot air up to the defrosters. I have one, but it is rusted so bad i cannot use it.
My 50 is a 12 volt. I was gonna mess around and find a switch that can hopefully reverse polarity. My heater is very simple. Has a blower motor mounted above a flat core (no squirrel cage). All the heat blows out the bottom after its pushed through the core by the fan. To be honest, I haven't looked that hard for what I need just yet. But its gettin cold around here. I need to get on the stick.
You don't need 4 wires to get reversible, you just need to make sure the motor isn't grounded to the case (one wire). All the Siemens motors have two wires. Some are listed as "non-reversible", I don't know if that's really true, but a lot of them are listed as reversible.
Here are some promising possibilities I saved from a previous thread:
'49 Ford -- NAPA. PN 455-1020, $23.55 + tax
'50 Merc -- NAPA # 655-1020
'46 Ford car with 3 doors: Balkamp replacement-BK6551022
The stock motors had 4 wires, one for each brush and one for each field coil. I have taken a standard single speed motor and made it reversible, but my problem has been finding the correct size case and shaft diameter that is reasonably priced.
We both posted above why we wanted them to reverse. And like I said above, mine is a 50 F1. And I have no idea what brand the heater is. Not a single mark on either of mine. But I can tell you neither of mine are magic aire.