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Thread: Disco2 heater always on

  1. 21st November 2017, 04:48 PM #1
    Phil_Seymour
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    Disco2 heater always on

    The heater in my Disco 2 is always on even with the climate control unit set to LO on both sides I get hot air... any ideas why?
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  2. 21st November 2017, 04:53 PM #2
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    Eevo
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    aircon working?
    Current Cars:
    2013 E3 Maloo, 350kw
    2008 RRS, TDV8
    1995 VS Clubsport

    Previous Cars:
    2008 ML63, V8
    2002 VY SS Ute, 300kw
    2002 Disco 2, LS1 conversion
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  3. 21st November 2017, 05:38 PM #3
    JR1
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    No gas??
    .............
    Cheers, Josh
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  4. 22nd November 2017, 09:15 AM #4
    strangy
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    A couple of reasons possible.
    1/ Blend motors not working - electrical circuit.
    2/ Obstruction of the blend motor mechanism - linkage fail or obstructed possibly, from some additional accessory wiring etc.
    3/ HEVAC control ECU fail.

    https://www.google.com.au/url'sa=t&r...igOP4xQVl81ZRK
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  5. 22nd November 2017, 09:52 AM #5
    DiscoMick Guest
    You might also check if there is any gap in the ventilation piping in the engine bay, which is letting in hot air. Our Defender has this problem. I must get around to fixing it.
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  6. 4th December 2017, 07:43 PM #6
    Phil_Seymour
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    No aircon

    Quote Originally Posted by Eevo View Post
    aircon working?
    No. Clutch engages and spins compressor. Engine just rebuilt (V8 slipping sleeve problem) so maybe installers goofed. However even without aircon I would have thought fresh air should be able to bypass the heater core.
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  7. 4th December 2017, 08:19 PM #7
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    singlecell
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    Does the hot air come out of all the vents or just certain ones?
    2003 D2a TD5 Auto
    1960 Series 2 Petrol
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  8. 4th December 2017, 11:05 PM #8
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    trout1105
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    The coolant flows through the heater matrix Full Time and the temperature is controlled with various flaps to allow hot or cold air flow.
    If your air con is working and yet you still have only hot air coming through then I would be investigating why these various flaps aren't operating correctly.
    You only get one shot at life, Aim well

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  9. 5th December 2017, 08:41 AM #9
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    Pedro_The_Swift
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    Quote Originally Posted by trout1105 View Post
    The coolant flows through the heater matrix Full Time and the temperature is controlled with various flaps to allow hot or cold air flow.
    If your air con is working and yet you still have only hot air coming through then I would be investigating why these various flaps aren't operating correctly.

    X2
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  10. 6th December 2017, 12:02 PM #10
    Jazzman
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    Just to cover off the simple things that are sometimes easily missed. Is the econ button pressed, it will display econ at the top left corner? Because if it is the aircon compressor is not turned on.

    Also if the aircon is working you should be able to see the clutch on the front of the compressor spinning with the pulley. When the econ button is pressed the clutch will disengage and only the pulley will spin.
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