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Thread: Heater fan - best way to diagnose?

  1. 13th July 2017, 10:52 PM #1
    RaZz0R's Avatar
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    Heater fan - best way to diagnose?

    Hi All,

    So I have been reading up as much as I can and also searching here.

    Before I go ripping the dash apart and trying to get in to the scuttle pan I wondered how could I diagnose the following;

    Issue - Heater fan not working. No fans work unless aircon switch is on and the fan switch on high;

    Could be either the blower itself or the resistor pack?

    I also came across this;
    You cannot buy the resistors anymore, only aftermarket ones are available. The aftermarket ones are just made from resistors that you can buy in you local electronics store, so you can make them yourself. You need a 2.0 ohm, 1.5 ohm, and 0.5 ohm resistors. No real need to pull your dash apart as you only need to unplug the old resistor wiring under your dash and plug in your made one.
    So with that in mind - I wonder how I could test to figure out if its the resistor pack or the blower; and if its the resistor pack, has anyone done the above where they have made their own?

    Thanks in advance!
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  2. 14th July 2017, 06:42 AM #2
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    Watching with interest.
    My resistor pack has failed and the fan only blows on the high setting.
    Cheers, Kyle



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  3. 14th July 2017, 07:07 AM #3
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    what yr is it?
    I recently picked up a 91 RRC, the fan works on all speeds with AC mode but I have no fan at all when switched to heater. even on high
    I think the heater fan is burnt out...
    89 RRC
    92 RRC Sherwood
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  4. 14th July 2017, 10:15 AM #4
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    Quote Originally Posted by roverv8 View Post
    what yr is it?
    I recently picked up a 91 RRC, the fan works on all speeds with AC mode but I have no fan at all when switched to heater. even on high
    I think the heater fan is burnt out...
    Its a 94 - I too have a 91 still parked in my carport so I can rip in to that for parts.

    But I am keen to know more about not having to do that ****
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  5. 14th July 2017, 10:56 AM #5
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    Before doing any of the above checks, make sure that either or both of the three-position switches are not broken or that the connectors have not come adrift. The switches are notoriously flimsy and expensive to replace, but at least they are relatively easy to access.
    Be careful removing the connectors as the terminals are riveted on and can easily fall off! The switches are sort of repairable, but being so flimsy makes it difficult.

    2013 D4 expedition equipped
    1966 Army workshop trailer
    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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  6. 14th July 2017, 01:55 PM #6
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    Quote Originally Posted by DieselLSE View Post
    Before doing any of the above checks, make sure that either or both of the three-position switches are not broken or that the connectors have not come adrift. The switches are notoriously flimsy and expensive to replace, but at least they are relatively easy to access.
    Be careful removing the connectors as the terminals are riveted on and can easily fall off! The switches are sort of repairable, but being so flimsy makes it difficult.

    Awesome tip! I'll be doing this tomorrow for the first bit of work for the weekend. I'll report what I find

    Cheers!!
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  7. 14th July 2017, 11:25 PM #7
    Davo
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    I found the resistors on a '92 under the decker panel, so you might be able to see them through the intake vents.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  8. 15th July 2017, 07:23 PM #8
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    Quote Originally Posted by RaZz0R View Post
    Awesome tip! I'll be doing this tomorrow for the first bit of work for the weekend. I'll report what I find

    Cheers!!
    Well - I found that the switch is fine - funny enough we found with all settings set to heater - that the aircon fans turned on but not very fast... and very quite as well.
    But no heater blower thats for sure.

    So next up will be the resistor pack. Fun times!
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  9. 15th July 2017, 08:11 PM #9
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    Do you have a wiring diagram? PDF attached FYIEFI aircon wiring diagram.pdf.
    2013 D4 expedition equipped
    1966 Army workshop trailer
    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
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  10. 16th July 2017, 10:21 AM #10
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    Quote Originally Posted by DieselLSE View Post
    Do you have a wiring diagram? PDF attached FYIEFI aircon wiring diagram.pdf.
    Thats for that. so yeah I can see the two step resistor there that comes on with the heater fans.

    As much reading as I have done - I am lucky in one way that I have a 91 RRC sitting here still with these parts working.

    BUT - thats going very soon to a mate that owns AMV, he going to rip out the 4.6 V8 for him self while i get the transfer case to keep as a spare.
    SO I need to rip all parts out that I might want or need before it goes. So Going to rip out the heater box and the resistor pack so I can see what I am dealing with.

    I also found this on rover parts that shows the wiring for the resistor pack and how to splice in their one... makes ya wonder
    Splicing In New Resistor On Range Rover Classic

    I did also come across a thread where some tech heads were talking about replacing the resistor pack with new technology using fetts? \ solid state setup.
    However this is getting in to an area of electronics that past my understanding
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