Why does air conditioning constantly come on with heat?
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Cadillac SRX Second Generation Forum - 2010+ Discussion, Why does air conditioning constantly come on with heat? in Cadillac SRX Forums; I think I already know the answer to my own question as I believe this was discussed in one of ...
  1. #1
    NJRonbo is offline Cadillac Owners Enthusiast
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    Why does air conditioning constantly come on with heat?

    I think I already know the answer to my own
    question as I believe this was discussed in one
    of another forums while I owned my CTS.

    I realize that it's standard for the air conditioner
    to kick in with the heat. I believe it has
    something to do with the vehicle conditioning
    the air. However, for my entire 15 minute
    ride to work yesterday, in 30 degree outside
    temp and the car console set on AUTO 72
    DEGREES, the air conditioner remained on
    the entire time.

    The car did manage to heat itself but there
    is an awful lot of fan noise coming from the
    air conditioner running at high.

    Just wondering what your experiences are
    and how normal this is.

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  3. #2
    GMJim's Avatar
    GMJim is offline Cadillac Owners Connoisseur
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    Re: Why does air conditioning constantly come on with heat?

    I don't use Auto, I prefer to set the fan speed myself.

  4. #3
    SoftballDad is offline Cadillac Owners Member
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    Re: Why does air conditioning constantly come on with heat?

    This has kind of bothered me too. I've read the manual (p 7-2 & 7-3) and I'm still not sure what is happening. In one part, it states that if the outside temp falls below freezing, the air conditioner will not run. (why freezing vs say 50F?)

    So ... when the AC button is lit, is it an indicator that the air conditioner is actually running or that it is available (automatic air conditioning)? I'm thinking the latter because I've driven when it's been below freezing and I've never noticed the AC indicator light off.

    I'm not thrilled with the gas mileage I've been getting, so if the AC is running it's making it a little worse than it needs to be.

    As far as the fan, If the noise is bothering me I tend to turn the temperature down (75F to 72F) instead of the fan speed.

  5. #4
    TheCaptain's Avatar
    TheCaptain is offline Canadian SRX Mod
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    Re: Why does air conditioning constantly come on with heat?

    The SRX uses a first time (that i've seen) air quality and humidity control system in it, so the vehicle runs the compressor in order to get the humidity correct. At least, this is from my basic understanding of HVAC and the new system.

    Ewillard might be able to explain more.

  6. #5
    sube5186's Avatar
    sube5186 is offline Cadillac Owners Connoisseur
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    Re: Why does air conditioning constantly come on with heat?

    I've often wondered about this as well. Apparently, it's related to the defogger. This is a little confusing for those of us who hear "air conditioning" and immediately think "cold air".

    Page 7-3 of the manual:

    Press AUTO to return to automatic
    operation and the air conditioner
    runs as needed. When the indicator
    light is on, the air conditioner runs
    automatically to cool the air inside
    the vehicle or to dry the air needed
    to defog the windshield faster
    .


    Sube

  7. #6
    NJRonbo is offline Cadillac Owners Enthusiast
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    Re: Why does air conditioning constantly come on with heat?

    Thank you Gentlemen.

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