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Disco 2 Air-conditioning upgrade

Discussion in 'Land Rover Discovery' started by mad85, Jul 1, 2022.

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  1. sierrafery

    sierrafery Well-Known Member

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    I have no doubts about what the instructions do say but for a D2 those instructions have absolutely no effect nor logic as long you understand how the system works so next time when you top up you can let the internal settings as they were believe me...the system's pressure has nothing to do with the blower or flaps position
    that seems like a weak contact on the circuit somewhere which gets hot and cedes under load, can be the relay "tired" too
     
  2. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

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    I'm sure you are right , you very nearly always are!!!
    Which is why i always pay full attention to what you say.
    And true, the instructions are aimed at anyone with an air-con system on their car.;)
     
  3. lynall

    lynall Well-Known Member

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    D1/2/3 I have owned all the same come the real heat of summer, they work just fine, but do take a minute or three to get some proper cold air coning out of the vents, they do seem to work better if you are on a fastish road straight away, in town there does not seem to be enough air flow over the condenser.
    D3 and the 3 even had rear a/c, but still the same.

    Huge internal volume compared to normal cars, most trucks hold less gas than the discos.
     
  4. discool

    discool Well-Known Member

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    As far as the AC fitted to my 25year old disco I has 6c out of the dash vents even on the hottest days in the UK.
    The disco was my first vehicle fitted with AC so interested in what it did, my fingers on the steering wheel felt they were freezing, the vent temp was less than the 6c today, so the system was switch off and later back on when I was in France/Belgium at the time, then the outdoors ambient temp at the time was 40c plus… it seems to get HOT over there in summer.

    The discos AC system still has the refrigerant it had when it left the factory, so no leaks, possibly because its used summer & winter, it looks after the seals I understand :)

    Now we have climate control i’m still playing with the AC dash control, I thought I could just dial the temps for both sides and that is that, but the system thinks differently. :(
     
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  5. NPG

    NPG Well-Known Member

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    AFAIK the electric fan is 12" in diameter and is rated at 4000 cfm. Airflow is not just a question of wattage or rpm but depends very much on the size and pitch of the blades. You'll notice that the blades on the original fan are curved, which gives them more surface area and therefore can move larger volumes of air. You might also want to ensure that the condenser is not damaged or blocked and thus obstructing air flow. The typical performance readings for the A/C with the vehicle stationary and the engine running at 1500rpm are as follows -

    upload_2022-7-2_0-19-46.png
     
  6. kermit_rr

    kermit_rr Green Member Full Member

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    I learned fairly recently, that's an urban myth.
     
  7. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

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  8. kermit_rr

    kermit_rr Green Member Full Member

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  9. kermit_rr

    kermit_rr Green Member Full Member

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  10. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

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    I don't think it is a question of anything attacking the seals more a question of them drying out if not lubricated by the lube in the gas.
     
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  11. kermit_rr

    kermit_rr Green Member Full Member

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    Maybe not the right word.. but it's exposure to air that causes rubber to deteriorate/dry out/crack. There's no air in an ac system
     
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  12. marjon

    marjon Well-Known Member Full Member

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    Why does it leak when a seal does deteriorate then?;)

    Cos at least 1 side is exposed to air, no?;).

    Too technical for me now going to the joke fred:).

    J
     
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  13. sierrafery

    sierrafery Well-Known Member

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    Guys, i beg you all those who claim to use the aircon in the winter to keep it fit to try to understand how that system works... there are sensors involved so the compressor will not kick in unless the selected inside temperature is lower than the ambient... in the winter the heating system will work which has nothing to do with the aircon side.... period, thats in a nutshell while it's more complicated but to keep the A/C system's seals lubricated you need a working compressor which will not kick in if it's cold oustide whatsoever ... i hope you all see what i mean.

    for those who doesnt believe me here's an analogy: put the refrigerator out in the yard when it's 0*C outside and see if the compressor will kick in or not to keep your food at 6*C cos even that simple thing has a thermostatic switch in it:cool:
     
    Last edited: Jul 2, 2022
  14. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

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    I'd be surprised if there was no water or other liquid in there, and we all know what that can do it not moved around a bit from time to time.
    Wonder if they are just telling us to use it regularly to spread out their work load rather than it all falling in the first hot spell.
     
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  15. DanClarke

    DanClarke Well-Known Member Full Member

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  16. discool

    discool Well-Known Member

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    You have moved to AC with climate control, which I find a pain, winter and summer But with manual controlled AC as fitted to my D1 works fine, and yes the compressor will engage with 500cm of snow on the vehicle.
     
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  17. kermit_rr

    kermit_rr Green Member Full Member

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    Running the ac wouldn't have an impact on that? My brain hurts now. Doesn't take much
     
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  18. NPG

    NPG Well-Known Member

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    Indeed, cold drink vending machines are normally equipped with heater coils to control the inside temperature when it gets too cold outside.
     
  19. lynall

    lynall Well-Known Member

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    My first posh D1 a 300 ES manual would not pull away on a steep hill with 7 people on board and the ac on, D2 not much better.

    I will have the measure the vent temps on my D3 and report back
     
  20. lynall

    lynall Well-Known Member

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    Iirc some better quality freezers have two stats in case they are installed in an out building.
     
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