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| | | | Joined: Nov 2005 Posts: 324 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 324 | I am modernizing a '47 1/2, and a '48 panel. Does anyone know of a multi speed 12v heater motor? The original 6v motor uses a resistor in the switch for two speeds, high and low. With my 12v system that's high and blastoff. The resistor burned up. I used a rheostat for awhile, but it got so hot the plastic knob melted. Now I am ready to replace the 6v motor with a 12v. Napa has a 12v motor that will go right in, but it is only one speed. Similar to the American Classic part. American Classic also has the rheostat for speed control. Is the rheostat the way to go for heater motor speed control, or is there a multi-speed motor available? A multi-tapped motor. 5/16" shaft, 3 1/4" case, 2 studs 2" on center. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | any motor is one speed, you just need to get the variable resistor sw for 12V, which works fine - NAPA should have them or one of the vendors have them like this Bill | | | | | Joined: Jan 2006 Posts: 586 Shop Shark | | Shop Shark Joined: Jan 2006 Posts: 586 | I used a Comfort Temp part number 35576 motor and cut the shaft to length.This is a 12 volt reversible motor(PM motor).I used an orignal style two speed switch that clamps under the dash.It works well.
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| | | | | Joined: Nov 2005 Posts: 324 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 324 | I see now, I have checked three shop manuals and they all have the one speed motors with resistor networks for speed control. I liked the potentiometer I had because it was for a variable speed, but I think the multiple position switch type is more robust. I had replaced a fan motor in a window air conditioner that had multiple taps for the different speeds, but that doesn't seem to be an option for automotive. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | actually Walter, the sw on these ol trucks is a multiple tap ceramic resistor, high, med, low, like this original Bill | | | | | Joined: Dec 2005 Posts: 2,557 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 2,557 |
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams." "Look deep before you leap !!!" / "Everything is Everything" "If I say a mouse can pull a house, hitch him up"
| | | | | Joined: Nov 2005 Posts: 324 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 324 | Yup, I burned mine up, replaced it with an aftermarket rheostat, the one with the lighted plasic knob. Melted the knob. Now I will get a 12 volt motor, and one of those three position switches so it will look stock. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Even the BMW I used to have had a multi-tap resistor for blower speed instead of a multi-wound motor. Its very common.
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