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Moss Motors, Ltd » MGB/C » Mechanical » Smiths Heater

Smiths Heater

Last post 10-16-2006, 3:05 PM by Pakfan. 2 replies.
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  •  10-15-2006, 4:32 PM 1057

    Smiths Heater

    Reply Quote
    Why do I have a "drive resistor" (Moss part #131-560) attached to my heater box? The green wire (hot side) is pluged into one side of the resistor and two other wires come off of the other side. The blower motor does not work with the resistor installed but when I hook the two wires up directly bypassing the resistor the fan blower works.  Any reason that I need this part on there? It looks like someone just screwed it through the fan box and hooked the wires to it.  Oh by the way the car is a 79 B
    The early bird may get the worm but the second mouse gets the cheese.

  •  10-15-2006, 7:37 PM 1069 in reply to 1057

    Re: Smiths Heater

    Reply Quote
    I don't know your situation exactly, but what you described is a typical heater motor resistor. Yours appears to be defective. There should be a two position heater switch which directs juice either to the motor directly, or through the resistor. You can check it with an ohmeter.

  •  10-16-2006, 3:05 PM 1109 in reply to 1057

    Re: Smiths Heater

    Reply Quote
    Oops, you are right. I didn't know there was a 3 position switch in the car (off, low and high). The motor is very quiet in low but it is working. I don't know how much air it blows on low but the high does work when I push the switch all of the way down.  Thanks much for the help.
    The early bird may get the worm but the second mouse gets the cheese.