Hello from a newbie - Sonata defroster

Discussion in 'Hyundai Sonata' started by Peter, May 5, 2004.

  1. Peter

    Peter Guest


    I just bought a 2004 Hyundai Sonata LX last week, and have been
    extremely happy with the purchase. It's a great car!

    Just one small problem though - the a/c has a habit of coming on
    automatically whenever you change mode or have the defroster turned
    on. Also every time you start the car the a/c comes on if the
    defroster is on. I hate driving everywhere with the a/c on and as I
    live in New York it really is only necessary over the summer months.
    I also shudder to think of the effect on the gas mileage especially as
    we have some of the most expensive gas in the country.

    Has anyone found a way around this (apart from shutting the whole
    thing off and riding around with the windows open!!)?
    Peter, May 5, 2004
  2. Peter

    hyundaitech Guest

    The a/c comes on automatically when the defroster is turned on in this
    vehicle to aid in defrosting. The A/C acts as a dehumidifier. I believe
    you can manually turn the A/C back off by pressing the a/c button, but
    this will greatly decrease your defrosting capabilities.
    hyundaitech, May 5, 2004
  3. Peter

    NobodyMan Guest

    The defroster is doing exactly what it is supposed to do. By default,
    the AC compressor runs to dehumidfy the air, increasing the defogging
    speed it provides for your windshield/side windows. This system has
    been in place in MOST makes/models of cars for years now. Where have
    you been?

    This also provides the added benefit of using the compressor during
    the non-cooling season, allowing the oil in it to circulate. This
    benefits the entire system.

    Don't worry about the effect on your gas consumption. Many years ago
    running the AC seriously cut into your mileage, but anymore it puts
    very little drag on your engine, resulting in only a very slight
    amount of extra fuel consumption.

    So just relax!
    NobodyMan, May 8, 2004
  4. Peter

    Neil Guest

    I can confirm this with my Auto 04 Elantra GT. After a 500 mile round-trip
    over 3 days with a mixture of speeds and road types that normally averages
    31mpg without the AC on, dropped to around 29mpg with the AC on for about
    250 of those miles.

    Neil, May 11, 2004
  5. Peter

    NobodyMan Guest

    I can confirm the exact opposite. After a 2800 mile round trip in
    four days, I got about 35mpg/gallon with and without my AC running.
    The difference with the AC running was not noticeable. (This is a 2001
    Elantra GLS).

    This kind of evidence is not empirical and entirely anectdotal.
    Studies have been done and the data is out there showing that modern
    AC systems have neglible impact on gas consumption. I trust those
    over what happens on a few cars that people give "their" stories
    NobodyMan, May 12, 2004
  6. Peter

    Neil Guest

    ::sigh:: I'll be sure to add the disclaimer, "your mileage may vary" in
    future so as not to confuse people into thinking I was implying my
    experience was anything other than my own experience.

    If you're so adament that correct and factual evidence be quoted, how about
    showing us some references, otherwise how am I to believe *you*?

    Happy driving.
    Neil, May 12, 2004
  7. Peter

    NobodyMan Guest

    Do some research at a local library. I found the stuff I needed at a
    local university library using one of their abstract systems that
    searches current literature. Systems like that contain so much more
    than the books ever can, as periodicals and peer-review stuff is so
    much more topical and current.
    NobodyMan, May 13, 2004
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