Fluctuating AC blower

Discussion in '80-Series Tech' started by whodat, Aug 2, 2005.

  1. whodat

    whodat

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    When the AC is on low, it blows at varying speeds. In other words, It will blow on low speed then every few seconds cycle through a high speed. The whole time the light for the low is on. I'm guessing it will do the same with the heat on low. Blower motor going? :eek:
     
  2. RavenTai

    RavenTai

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    Does it go all the way to high?

    mine seams to do something similar, in auto, it seams there are finer/more settings available to the climate computer than the 4 that are available with the buttons, but in low it is a set of low speeds it will not go all the way to high wile still showing low. as it brings up the speed it will eventually move the light to the next button an so on and so forth. Another example is moving the temperature slider slightly the fan speed will change slightly but still light the same button. Seams normal and logical to me.

    Is that what you have or something else?

    Another thing that may be going on is it may be cycling between re-circ and fresh air for some reason that makes a noticeable change in fan noise and flow.
     
  3. tarbe

    tarbe

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    Mine fluctuates when on auto. Kinda unnerving. I leave it in manual mode for that reason.
     
  4. parabola

    parabola

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    Mine also fluctuates while in auto mode! But, only when auto has decided to use fresh air rather than recirculating. Drives me nuts.
     
  5. reffug

    reffug

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    Not having auto mine leaves me quite sane thank you.
     
  6. tarbe

    tarbe

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    You gotta have something else going on there :grinpimp:
     
  7. sjcruiser

    sjcruiser

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    On Auto control, the Fresh/Recirc. mode is determined mainly through the ambient temperature AND the cabin temperature setting. Adjust the setting to be a tad colder if you don't want fresh air.
     
  8. parabola

    parabola

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    Yeah that does kick it back to recirc, but that doesn't explain why it cycles the way it does. We're talking about hearing the blower cycle up and down about once every 3 seconds or so. It's really annoying and something doesn't seem to be working properly here...

    And if y'all's is anything like mine, it has this really bothersome click and squeak when it goes from high to low during this cycling madness. ARGH.
     
  9. whodat

    whodat

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    Mine does it even when not on auto mode :mad:

    Seems like the fan is going...but it surges beyond the low setting.
     
  10. parabola

    parabola

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    It's not so much being in auto mode as it is being in 'fresh air' mode. 'auto' just so happens to be the only time my truck ever gets in 'fresh air' mode.

    Well, at least those are my symptoms.
     
  11. sjcruiser

    sjcruiser

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    Parabola,

    Have you checked if the cabin temp. sensor is clogged or not?
     
  12. parabola

    parabola

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    No, I have done zero troubleshooting on this issue so far. Guess I could take a look tomorrow....
     
  13. tbo_cruiser

    tbo_cruiser

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    bump

    Anybody figured this out yet? I have the same issue. The range of variability in the motor speed seems quite wide to me. I have not directly try to compare to see if it gets to high speed, but it has to be close. Very annoying.
     
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