HVAC Question

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Thread: HVAC Question

  1. #1
    Join Date
    Aug 2007
    Winnipeg, MB, Canada
    Thanked 14 Times in 11 Posts

    HVAC Question

    Okay, I'm lovin' the new van (05 DGC SXT, 3.8l). One minor issue has come to light recently. Now that the temperature has taken a nosedive, I am now using the HVAC system more now. The issue is this: When I first start my van on a cold morning, I turn the HVAC on Defrost setting (Blowing on the windshield). I will leave it there until the windshield is completely clear, then I will turn it to the floor setting. The problem being, when I do this, rather than blowing to the floor vents, it blows out the vents in the dash. In fact the only way I can get the floor vents blow by themselves is to turn the control knob from defrost all the way to vent setting, then slowly back to floor setting.

    Now back in the day, a problem like this was due to a poorly adjusted, loose or broken cable. Obviously things have changed since then, and now my understanding of the inner workings of my vehicles HVAC system is vague at best. Thus: I have no idea what could be causing this problem.

    Does anybody know what's going on here? Also, can anybody point me to a good web site so I can update my understanding of how a vehicle's HVAC system works.
    If at first you don't succeed, get a bigger hammer!!

    Current ride:
    2005 Dodge Grand Caravan SXT (3.8L, purchased at 108,000kms. Now at 166,000km and counting)

    Past rides:
    1997 Dodge Caravan Rallye (3.3L 242,000kms)
    2002 Chevrolet Cavalier (Base Model)
    1988 Ford Ranger (2.9L 2wd)
    1973 Dodge Cornet Wagon (318 cid)
    1965 Rambler Classic 550 4 dr (232 cid)
    1966 Rambler Classic 55 Wagon (232 cid)

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  3. #2
    Join Date
    Jan 2008
    Nova Scotia, Canada

    I generally leave mine in defrost/floor setting most of the time and go from there as needed. Sounds like your mechanism is a bit sluggish when cold. Any better when things are warmed up?
    Heat is full flow through your pipes, there are no control valves like there used to be.
    Take a look at the ARRC site for info: http://www.oplin.org/search/google/a...itesearch=#195
    2007 GC SXT - Magnesium - S&G - 3.8L - 173,000 kms
    2002 GC Sport - Stone White - 3.3L - 358,500 kms
    2003 Jeep TJ Sport - 4.0L - 279,000 kms

  4. #3
    Join Date
    Jul 2008
    Niles Il.

    I know on the 3rd gens you can run a test to recalibrate the system, there may be a similar thing on the 4th gens. Someone here should know...
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top

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  6. #4
    Join Date
    Sep 2009
    Thanked 1 Time in 1 Post

    2001 Chrysler Voyager 2.4L SE

  7. #5
    Join Date
    May 2009
    Thanked 4 Times in 4 Posts

    Quote Originally Posted by hanibal View Post

    Thank you for this bit of information. I had noticed that the air coming from the floor vents was somewhat warm when the cold temperature was set. Performing this procedure fixed the problem.
    2005 DGC Special Edition
    3.8L 73.5K
    Stow n Go

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