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AC fail/light flashing

Discussion in 'Interior' started by h2100, May 21, 2020.

  1. h2100

    h2100 Member

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    Hello All,

    My 2010 'hoe is not blowing cold air and the AC Snowlake flashes three times when it is activated. I tried a trick I read where you try to reset something by pressing the recirculate air button and the snowflake at the same time for 10 seconds. It did not fix the issue.

    A bit more googling pointed me towards the Ambient Air Temp Sensor. Seems to make sense as the AC should not work in the very cold and the light flashes the same way.

    FYI, my outside temp reading seems to be working and accurate.

    So, I ordered two sensors as I saw a video that say the previous model had two. They are not costly, $10 each.

    Finally the question, how many do I have? Are they behind the passenger headlight and/or just in front of the radiator?

    Any other ideas on why the AC may not be working?
     
  2. BG1988

    BG1988 Full Access Member

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    how many times does it flash sometimes that will be the error code


    I also suggest you clean the a/c condenser (with a toothbrush gently) Assuming it has never been cleaned that is 11 years of bug build up even after a few months there is a tremendous amount of bugs on mine... (DON"T spray water on it unless it's distilled water ) Also make sure both fans turn on if the second fan does not turn on the A/C will not clutch

    another thing to check is if some one disconnected the A/C power cable (the part the powers the clutch magnet. ) check the belt for the A/C could be broken?


    Remember there is moving parts in this area when the engine is running


    shops do this all the time to drum up business. I had pepboys disconnect my MAP sensor before this almost caused me to stall out on the train tracks (just a few feet before)
    and a train was coming btw
     
    Last edited: May 25, 2020 at 12:11 AM
  3. wjburken

    wjburken Supporting Member

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    @UmmScott might have some ideas.

    Is this a new condition? Any work done on vehicle around the time this all started?
     
  4. 91RS

    91RS Full Access Member

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    Umm no. Absolutely none of this.

    The light blinking 3 times means that ac request is being inhibited by the ECM. This could be for a number of reasons including something not related to the AC at all or it could have a leak (which would make the pressures out of spec). Throwing parts at it is just wasting money.
     
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  5. h2100

    h2100 Member

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    The catalytic converters went bad before this light came on. Those have been replaced
     
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  6. wjburken

    wjburken Supporting Member

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    One thing you could try for free, albeit it’s a long shot, is disconnect the battery and either turn your head lights on and off or hit the brake pedal a few times. This is a kind of “reboot” on the electrical system and gets rid of and residual voltage. It sometimes helps with odd stuff, but is not a sure fire thing by any means.

    How had your A/C been working before this? Have you visually inspected the A/C belt to drives your compressor to make sure it’s still there?
     
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  7. h2100

    h2100 Member

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    Suggestions
    ?
     
  8. UmmScott

    UmmScott Full Access Member

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    91 rs is correct.

    Ac light blinking means that in the current situations, the ECM is not allowing the AC to come on.

    Could be a number of reasons.
    First make sure you dont have any DTCs set. If you have critical ones like engine misfire or a failed sensor, the ecm can disable the AC until said condition is corrected.

    Another thing.
    If your system is the newer style, it has a pressure transducer on the high side. The ecm can tell the exact high side pressure. This is used to prevent operation when theres no charge, to bring on rad fans as needed, and a high pressure cut off if pressures get too high.

    If system charge is low, then the ecm wont allow the clutch to pull in

    Sent from my SM-G975U using Tapatalk
     
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  9. BG1988

    BG1988 Full Access Member

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    no he needs to see if the second fan is running the A/C will not turn on with it not working fans can go out at anytime..

    that is why he needs to check the belt and connections to the A/C clutch..(as well as the second fan) also cleaning the a/c condenser on the front of the car will allow you to inspect for pebble/rock damage...


    with the Engine Off you see if the fan can be moved with a stick..(preferred with the battery disconnected)

    i never said he should buy anything TEST the working conditions. first


    Belt
    fan
    cable connections

    these don't cost anything to check
    as you can see them your self
     
  10. Galante

    Galante Supporting Member

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    lmfao.... welcome to ‘brents world’
     
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