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How to test heater blower motor.

Discussion in 'Defender 90 / 110 / 130' started by mercanlandy, Nov 28, 2010.

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  1. mercanlandy

    mercanlandy Active Member

    Jan 8, 2010
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    Hi, I have set about getting the blower working on my 1988 110.

    I have just ordered a new dash control switch, the original had been disconnected and a dodgy sitch fitted that was wired wrong to start with. I have checked that power is going to the motor via the purple wire, and at the cab end I have power showing at both green wires that go onto the control switch. the black is an earth, or so the wiring diagram shows.

    Can I put a "link" somewere at the fan end to bypass power directly onto the motor to see if it will spin? I am hoping not to have to remove the heater fan just yet incase it is actually in working order. I am suspecting the carbon brushes will be worn out though. I did an enquiry about replacement brushes but they are not a service part you can obtain from landy dealers. I have had an email from a carbon brush supplier though who reckons he has brushes that are exactly the same and will do the job.

    If there is a known test I can do to see if the fan will run by using a link wire,


  2. Ghost

    Ghost New Member

    Mar 18, 2007
    Likes Received:
    Reviving this thread after a search as I've got a similar question. Is the heater blower motor fitted to my 91 Defender 90 a permanent live with a switched earth? From examining the wiring diagram this is the only possibility I can think of.

    I have two heater blowers, one fitted to the vehicle which has a live at the purple wire going into it but nothing at all at either of the green wires coming out, and the resistance across the motor is OL. I have a second heater motor which has zero resistance at all but when plugged in just blows the fuse as soon as it's switched on.

    Am I right in assuming that the first heater motor is buggered, probably due to worn brushes, and the second has a short circuit in it somewhere?

    Also, will the blower from the 1995 Discovery I'm breaking fit?
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