How do I disable auto a/c defrost?

Discussion in 'Interior' started by SnowDrifter, Nov 29, 2018.

  1. SnowDrifter

    SnowDrifter Full Access Member

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    I don't necessarily want my a/c trying to dry out the air for defrost. My last car was a subaru and it had this little actuation lever I could remove inside the HVAC controls. Mechanical control, easy easy.

    I have auto climate control in my rig now. Not really that simple. I'm loathe to snip wires and try to install a manual switch. Having switches to control my a/c just feels janky as hell.

    So... I mean... Is there something I can program? Flash? Solder? What I want, is for the a/c compressor to stay off, independent of anything else, until press the button to flip it on
     
  2. Tonyrodz

    Tonyrodz Full Access Member

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    Back in the simpler days of GM, I would just unplug the ac compressor in the winter, for this exact ssme issue. I never understood why GM did that, until someone told me it takes the humidity out of the air.
     
  3. Doubeleive

    Doubeleive Elite Member Supporting Member

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    ya the auto systems act as a dehumidifier
     
  4. SnowDrifter

    SnowDrifter Full Access Member

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    Yeah I know what it does but I don't necessarily want that functionality all the time. There are a lot of times it works against me TBH
     
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  5. mikeyss

    mikeyss Full Access Member

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    I think... If you mode select to defrost and floor, it will light up the A/C button. Just press it and it turns the A/C off but it'll still blow on the windshield and floor. I'm not 100% sure about this, but it's worth a try, haha. My 09 Tahoe has auto climate, I'm gonna try it in the morning.
     
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  6. CountryBoy19

    CountryBoy19 Full Access Member

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    Correct, when you press defrost it defaults to the AC compressor being on, you have to manually toggle it back off. The OP is asking if there is a way to "tune out" the auto-on feature so he doesn't have to manually toggle it back off.
     
  7. SnowDrifter

    SnowDrifter Full Access Member

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    Wasn't aware I could do that. Will give it a try later today.


    Having it default to off would be ideal but I can live with toggling it
     
  8. Justinj360

    Justinj360 Senior Member Supporting Member

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    So does this mean when you manually turn off the AC it's not actually off? I've always suspected that because even in the hottest months in the summer I almost never have to hit the snowflake to turn it on. It gets plenty cool without it.
     
  9. SnowDrifter

    SnowDrifter Full Access Member

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    Verified it works. That's a neat trick!

    Wonder what other hidden gems these vehicles have
     
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  10. Fless

    Fless Full Access Member

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    I have heard that the A/C compressor cycles from time to time to keep the seals intact.

    If you won't use it all winter, removing the A/C drive belt might be something to consider.
     

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