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How to cancel Auto ventilaton?

Discussion in 'General 4Runner Talk' started by taco_runner, Jan 7, 2022.

  1. Jan 7, 2022 at 2:53 PM
    #1
    taco_runner

    taco_runner [OP] New Member

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    Is there a way to disable this feature, when you select windshield to defog, it always automatically sets the ventilation to (fresh) ouside air. I live in a dusty and heavy construction area and the air is polluted so I want to switch to "recirculate", but it won't allow me.

    On my cheap vehicle, this is enabled by default, but it can be disabled so I can switch to recirculate.

    Is there a way to do this on the 4Runner? Thanks

    Recirc.jpg
     
  2. Jan 7, 2022 at 3:01 PM
    #2
    LandCruiser

    LandCruiser I have Toyotas

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    No, when you are defogging the windshield, you cannot re-circulate. This is for obvious reasons because you’re a human and you make lots of water vapor when you breathe.
     
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  3. Jan 7, 2022 at 3:40 PM
    #3
    Beachguy

    Beachguy Normal turned up too loud

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  4. Jan 7, 2022 at 4:34 PM
    #4
    taco_runner

    taco_runner [OP] New Member

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    At least toyota should have made it cancellable.
     
  5. Jan 7, 2022 at 4:36 PM
    #5
    LandCruiser

    LandCruiser I have Toyotas

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    Nope. The air conditioning also comes on with the defogger, and it can’t be shut off either.
     
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  6. Jan 7, 2022 at 4:38 PM
    #6
    taco_runner

    taco_runner [OP] New Member

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    Of course the A/C should come on so it will heat up... but the ventilation, like in my case, I drive in heavy construction and dusty road every morning. So I will have to suffer because toyota "thinks" outside air is good for me?
     
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  7. Jan 7, 2022 at 4:55 PM
    #7
    jmkulbeth

    jmkulbeth Have you tried turning it off and on again?

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    Bone stock!
    Doesn't the cabin air filter catch the dust and crap?
     
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  8. Jan 7, 2022 at 4:58 PM
    #8
    Mtbpsych

    Mtbpsych New Member

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    If you select the defogging and feet vent setting, it’ll allow you to recirculate the air. That’s what I do.
     
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  9. Jan 7, 2022 at 5:00 PM
    #9
    Snickel Fritz

    Snickel Fritz Do not develop this member's app

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    I was bothered by this, too. One of the things that didn't make sense to me is that despite my breath causing moisture, some days the fog outside was far worse than anything I could be causing inside a sealed cab. I'm okay with the A/C being on, because that helps remove excess moisture... but drawing in from outside, on a foggy morning or night, I have to have the heat on full blast with the fans on high to make the windshield usable. My older Toyotas were so much easier to drive in similar conditions. I had to pull over and wait for a couple of hours once because the outside humidity was so bad, and it was so hot, that my air couldn't fight the steam coming in.
     
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  10. Jan 7, 2022 at 5:04 PM
    #10
    taco_runner

    taco_runner [OP] New Member

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    Yes that's what i am doing now, but there are times when you want the windshield to defog quickly.

    Nope, it's like wearing a mask to prevent covid...LOL.. but that's a different topic
     
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  11. Jan 7, 2022 at 6:11 PM
    #11
    ElectroBoy

    ElectroBoy Ad astra

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    This feature drives me crazy too. Like when following a diesel truck and trying to recirc and defrost the windshield fast. Can’t do it.

    I had no trouble with my old 2000 3rd Gen. The HVAC was all manual so I could shut out all external air, turn on the A/C, and set it to deflect to full windshield. It worked great in all conditions in cold winter snow, rain, fog, etc. Can’t do that on the 5th Gen.

    What *kind of* works for me is setting it to A/C on, fan speed high, recirc, and the diverter set at the halfway point between all floor and windshield/floor. You have to press the button to set the recirc on every time you start the vehicle, otherwise it defaults to outside air.
    8C0AF9A4-8FB2-49E2-BCD9-373BB3BEB671.jpg
     
    Last edited: Jan 7, 2022
  12. Jan 7, 2022 at 6:39 PM
    #12
    ElectroBoy

    ElectroBoy Ad astra

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    @Old Red has reverse engineered a lot of the 5th Gen electrical, computer, and HVAC systems and has quite a knowledge base. Maybe he has a solution.
     
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  13. Jan 7, 2022 at 6:41 PM
    #13
    LandCruiser

    LandCruiser I have Toyotas

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    So how is it supposed to defog with the recirc on?
     
  14. Jan 7, 2022 at 7:03 PM
    #14
    taco_runner

    taco_runner [OP] New Member

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    by blowing hot/warm air on the windshield
     
  15. Jan 7, 2022 at 8:05 PM
    #15
    LandCruiser

    LandCruiser I have Toyotas

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    Do you ever see those clapped out shitbox cars from the 80s and 90s that have the manual HVAC controls and some dumbass is wiping the windshield because he can’t see out of it?

    That’s because he has the recirculation on and it’s a manual system that doesn’t override you.
     
  16. Jan 7, 2022 at 10:23 PM
    #16
    ElectroBoy

    ElectroBoy Ad astra

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    It’s the A/C that dehumidifies and blows dry air on the windshield.

    This was the HVAC panel on the 2000 SR5. All manual controls. Notice the two positions that diverted air to the windshield also had a suggestion to use with outside air. But it would adequately defrost when recirculating once you turned on the A/C. This technique worked for me for 18 years.
    AE13AA7B-6225-44D7-9D45-B66328FD5C6E.jpg

    As @LandCruiser described the scene, I lost count of how many fogged over people I told over the years about this technique. Whether recirc or fresh air, hot air or cold air, it’s the A/C that does the trick. I guess the car manufacturers eventually figured out that most drivers are stupid so they made it an automatic override.
     
    Last edited: Jan 7, 2022
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  17. Jan 8, 2022 at 9:08 AM
    #17
    alittleoff

    alittleoff New Member

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    And some may not know that most of the newer vehicles made today can not completely close off the outside air coming in.
    It has to do with the threat of asphyxiation, suffocation and carbon monoxide poisoning.
    Yeah, lawyers got involved.
     
  18. Jan 8, 2022 at 9:37 AM
    #18
    Old Red

    Old Red New Member

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    It's a long list...
    Let me do some looking. Off the top of my head, I think having recirculation on with the defogger is only possible on the dual zone system and not the manual. I think @ElectroBoy has the best option with the manual settings. Recirculation is automatically enabled with A/C, so setting it halfway between "fools" the system.

    Let me do some looking through the manuals/techstream because I believe pre-2020 and post-2020 are different. The ECUs changed, and this is all software enabled vs. the old standard true manual HVAC.
     
  19. Jan 8, 2022 at 5:52 PM
    #19
    taco_runner

    taco_runner [OP] New Member

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    I haven't mentioned, where I live, there's always sewer smell and farm smell (animal). Maybe I need to email Toyota to ask if there is a way to make the vehicle recirculate.
     
  20. Jan 8, 2022 at 6:54 PM
    #20
    LandCruiser

    LandCruiser I have Toyotas

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    Than you are really screwed, because even when recirculating, you’re still getting fresh air.
     
  21. Jan 8, 2022 at 7:02 PM
    #21
    taco_runner

    taco_runner [OP] New Member

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    nope
     
  22. Jan 8, 2022 at 9:35 PM
    #22
    ElectroBoy

    ElectroBoy Ad astra

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    I drove over a dead skunk on the road tonight, fan on medium speed, HVAC on recirc, A/C off. I still caught a slight whiff of stench. I’m glad I didn’t have any windows open.
     
  23. Jan 9, 2022 at 10:09 AM
    #23
    alittleoff

    alittleoff New Member

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    I'd rather get the faint smell of skunk than follow the Ford Navistar, half burnt diesel fumes.
    You know what I mean everybody.

    I'll pull off the road before and let that stank muffin roll on down the road.
     
    taco_runner [OP] and ElectroBoy like this.

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