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Thread: Cleaning fins of the A/C evaporator coil

  1. 16th March 2018, 08:22 PM #11
    prelude
    prelude is offline Wizard Supporter
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    Steve,

    I can see where you are coming from the KISS method is always preferred but (hence the nickname) I come from the honda world and I have built in climate control in prelude's that were never fitted with them. Sure, I used JDM spec parts but I really do like that complexity. My main gripe with landrover (valeo) is the quality of the stuff combined with the complexity. Most honda's built in the UK from the 90's are as reliable as their japanese counterparts, except for the crap that is put in there to make europe happy. ie. valeo anti-theft stuff, wiper motors etc. GUESS what breaks down? exactly.

    So I am looking to build a complete climate control system, initially controlled by simple buttons, that I can expand further on into say a touchscreen display like in the tesla model 3 and many more modern vehicle's. I would love to keep in touch regarding the metal stepper servo's. I can figure out quite easily how to make a bracket to mount them but I have yet to figure out how to deal with the plastic gear on the heaterbox. Should I replace it with a metal one (and how to go about that) or just leave it be for the time beeing.

    Anyhow, keep us posted mate! I will gladly borrow some of your ideas

    Cheers!

    -P
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  2. 17th March 2018, 06:54 PM #12
    zzsteve
    zzsteve is offline Master Supporter
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    OK, the servos on push-pull cables won't work as the friction makes it a bit marginal with the standard servo torque. Looking at direct drive on two and a short bell crank on the other. I have some bracket/mount drawings ready for laser cutting. Will post as it goes. I also wanted to convert the temp sensors (evap, heater, and ambient) to 10K thermistors to make the interfacing easier.
    BTW what is the 'plastic gear' on the heater box you refer to? It's all plastic from that I can see.
    Cheers,
    Steve
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  3. 17th March 2018, 09:19 PM #13
    prelude
    prelude is offline Wizard Supporter
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    Hi Steve,

    trying to keep my quota on the site in check so I am linking to external pictures, let's hope this works

    I was referring to this specific cog: https://ixquick-proxy.com/do/spg/sho...4911248bca8b3f

    that fit's into this contraption: https://ixquick-proxy.com/do/spg/sho...caa8348830f279

    when the blend flaps start to run heavy with age, a lot of stress is put on these two parts no doubt and I am not sure I can make that out of metal personally

    Cheers,

    -P
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  4. 17th March 2018, 10:32 PM #14
    zzsteve
    zzsteve is offline Master Supporter
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    Gotcha.
    Yep, that splined thing is just way too exotic to contemplate copying. I think I can fix a servo wheel directly to the plastic surrounding the female part. The servo can then engage with it's own splines on the wheel. This may not work for all three so a short push rod is in order for one of them. You will see they all have a 5mm hole on a lever for a cable actuator which must have been used in some way, either on a LR or some other manufacturer Valeo conned into using this heater box!
    Hopefully some pics of some components this week to make it clearer.
    Cheers,
    Steve
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  5. 20th March 2018, 10:59 AM #15
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    Scouse
    Scouse is offline OldBushie Gold Subscriber
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    Why don't you source the parts from a non-climate control P38?
    The panel might not have the A/C switch fitted but I'm sure parts could be swapped over.

    Cleaning fins of the A/C evaporator coil-range-rover-p38-breaking-manual-non-climate-hevac.jpg
    Range-Rover-P38-Breaking-Manual-Non-Climate-HEVAC.jpg
    Scott
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  6. 21st March 2018, 12:21 PM #16
    zzsteve
    zzsteve is offline Master Supporter
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    Thanks Scott,
    Yep, saw these, but would have had just as much effort sorting out drive to the blowers, recirculation motors and A/C request signals to the ECM.
    BTW: Which models/years had these fitted?
    Steve
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  7. 21st March 2018, 02:43 PM #17
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    Scouse
    Scouse is offline OldBushie Gold Subscriber
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    Quote Originally Posted by zzsteve View Post
    BTW: Which models/years had these fitted?
    As far as I know, all non-A/C P38s had this control panel. All cars sold here had A/C though so you'd need to get one from Europe somewhere.
    There's only one fan switch so the blowers would be linked & controlled manually. I don't know if the blend motors were electronic or cable operated though.
    Scott
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