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Thread: How-To: Disabling Automatic A/C - Defrost modes

  1. #16
    xfimpg
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    Thanks to everyone who contributed to this solution!
    I just finished mine and am looking forward to the results.

    Mike

  2. #17
    Registered Member willy65000's Avatar


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    Verry nice. Now if you could just tell me how to do that on My Mazda 3.

  3. #18
    goes to eleven chuyler1's Avatar
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    Sorry to ressurect this but I wanted this done from the day I got my P5. I like to run the heat through the defrost-floor in the winter time because it keeps the dry air from blowing in my face (and making my eyes dry out). However, I also like to get good gas milage which won't happen if I'm running the A/C all winter long.

    Excellent post! This should be sticky if it isn't already.

  4. #19
    Thread Killer eting_pro5's Avatar

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    Woah woah woah....mega serious question.

    The ventilation system is always moving air through it, even when it's off. Additionally, although the blower is turned to 0, the temperature dial still has a noticable effect on the air coming out.

    Does this mean if I leave the controls on defrost and the blower to 0, is my AC still on??? If so, I think Mazda owes me a few grand in gas money....I've never gotten good gas mileage, but I always drive with the vent control on defrost.

  5. #20
    Registered Member Bumble G's Avatar


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    Quote Originally Posted by eting_pro5
    Woah woah woah....mega serious question.

    The ventilation system is always moving air through it, even when it's off. Additionally, although the blower is turned to 0, the temperature dial still has a noticable effect on the air coming out.

    Does this mean if I leave the controls on defrost and the blower to 0, is my AC still on??? If so, I think Mazda owes me a few grand in gas money....I've never gotten good gas mileage, but I always drive with the vent control on defrost.
    No your A/C is not on when the switch is at 0.

    The temp dial makes a difference because it's hooked up to a manual "door" that alows engine cooland to either come into the heater core or not. The air flowing in from outside always passes over the heater core. when you turn the dial to hot, hot coolant runs into the heater core, the outside air passes over the hot core and voila hot air with setting still at 0.
    Bumble G


  6. #21
    Registered Member Blown's Avatar


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    Would there be a built in software solution. I know on my 2001 civic, holding a couple buttons while turning the ignition on disabled it.

  7. #22
    Banned Dexter's Avatar
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    ^ Doubt it. I dont think the control board is that intelligent.

    eting_pro5: put it on recirculated air. this closes the fresh air door and you will not feel any more blowing. it feels like the fans are blowing when on "0" but when you are moving it just fresh air coming i.

  8. #23
    Experianced noob loccusst's Avatar

    2003 Yellow Mazda Protege5 Autostick

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    I did this today while in the middle of working on my 95 contour (my winter beater). It took my all of about 20 min. to do, excellent right up and pics were definately the reason why it went quick. My contour also turns on the ac when you have the settings to defrost. Must be a Ford/Mazda thing.
    Anyone can drive fast in a straight line ...... Its driving fast around corners that takes skill.

  9. #24
    i've nothing to type here blynd_spy's Avatar

    2003 LX

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    led out?

    does doing this mod cause the recirculating air led to not come on? i changed the leds at the same time, but the led isnt burnt and the circuit board looks fine..

  10. #25
    i've nothing to type here blynd_spy's Avatar

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    nevermind, ifigured out my mistake.... the solder points for the led were touching...
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  11. #26
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    So, my main concern about this is whether this will actually help me save a little gas. Assuming that since the A/C is on, it wastes gas while I'm trying to de-fog my windows right? So, if I disconnect the A/C as shown, will I still be able to de-fog the windows without using the A/C??
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  12. #27
    i've nothing to type here blynd_spy's Avatar

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    you can still use defrost with out the a/c... however, it will not defrost as fast since the a/c acts as a humidifier and for reasons i dont want to look up causes the window to de-fog faster.
    Im still getting used to it since ive only driven my car once since i did it so hopefully someone will jump in....

    hope that helps
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  13. #28
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    As long as it works, that's all I need. I just hate using my A/C when defogging the windshield.
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  14. #29
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    Hey zap, got a question. you think that just closing the switch is sufficient enough to turn on the AC (as if i had pressed the A/C button on the console?)

  15. #30
    Electro-modder ZapWizard's Avatar


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    Quote Originally Posted by Dexter
    Hey zap, got a question. you think that just closing the switch is sufficient enough to turn on the AC (as if i had pressed the A/C button on the console?)
    I beleave so.
    There are two lever switches:
    One turns on the A/C
    The other activates the fresh air circuit.
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