'99 v70R AWD foggy windows

Discussion in 'Volvo V70' started by Kelsey Cummings, Oct 26, 2005.

  1. I picked up a nice v70R AWD a couple of months ago and now that it's
    getting cold in the morning I'm having a trouble with foggy windows.
    The *right* side of the windshield and passenger doors fog up when the
    heater is on. If the AC is turned on it defrost mode it clears it up.
    There is also a bit of a funny smell that I associate with using the
    heater. It doesn't exactly smell like coolant so I'm hoping there is
    another explanation than a leaky heating coil in the climate control.
    I'm not looking forward to the 12hr job pulling the dash apart if that's
    the case.

    Maybe I'll be lucky and the drain is plugged for the right side. Where
    is it and how can it be cleaned out? Anything else to check before
    tearing the dash open?

    Kelsey Cummings, Oct 26, 2005
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  2. Kelsey Cummings

    James Sweet Guest

    I would strongly suspect a leaking heater core, what's the smell smell like?
    James Sweet, Oct 26, 2005
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  3. Kelsey Cummings

    Glenn Klein Guest

    It is the heater core that is causing your problem it is not a 12 hour
    job the dashboard does not get removed @ most 3 hours

    "*-344-*Never Forgotten"
    Is for the New York City Firemen who lost their lives on September 11,2001.
    The official count is 343, but there was also a volunteer who lost his life
    aiding in the initial rescue efforts. And I will never forget them as
    long as I live,
    nor should any American.
    Glenn Klein, Oct 26, 2005
  4. It's hard to describe. Waxy. Not what I think of colant smelling like.
    Sounds like I should investigate the heater core though... I read it
    was a massive job somewhere and that the whole dash had to be
    dissambled. Glad to hear it's only a 3hr job.

    Kelsey Cummings, Oct 27, 2005
  5. Kelsey Cummings

    James Sweet Guest

    It really depends on the car, in some it truly is a massive job, in
    others it's not so bad. It's never easy though.

    The fog pretty much gives it away, remember also that the coolant may
    mix with other stuff when it leaks which can make it smell different.
    James Sweet, Oct 27, 2005
  6. When the air outside is cold, DON'T use recirculate. Even cold foggy
    outside air is dryer than the warm inside air and letting outside air
    come in will eliminate the fogging problem.

    When the outside air is not cold, you must use the AC when the defrost
    is on. This is normal. The AC will dehumidify the air.
    This can be caused by shutting the car off with the AC on. Volvo's
    solution on newer models is to have the AC/heater fan kick on after the
    water has drained out of the AC housing. They do have sprays they can
    use to eliminate the smell. They are anti-fungal sprays.
    This is also a problem. You usually get water on the passenger floor
    mat and sometimes the passengers legs when the drain is plugged. Usually
    the dealer can put it on a lift and clear it in a couple seconds. I
    haven't figured out where it is.
    Stephen Henning, Oct 27, 2005
  7. Kelsey Cummings

    James Sweet Guest

    But he said only the vent on the right side is fogging the windows, I
    suppose there could be another explanation but it sure sounds like a
    heater core to me.
    James Sweet, Oct 27, 2005
  8. It sounds like a loose duct hose to me. The heater core leak should
    affect the entire cabin.
    Stephen Henning, Oct 27, 2005
  9. It's not that there isn't airflow, just that the airflow is obviously
    very humid on the right side. It's probably is a leaky core. I was
    worried about the misinformation I'd picked up that it was a 12hr job
    otherwise I'd have already opened it up.

    Kelsey Cummings, Oct 28, 2005
  10. Heater core for sure - just had my new-to-me '99 XC done.

    Luckily I found this when my shop told me the whole dash had to be taken


    Looks so easy that if it hadn't been so cold, I'd have done it myself,
    but as it took the shop only 2 hrs (they said they'd get it down to 1.5
    with more practice with this method) it wasn't a bad deal at all at a
    little over 200 bucks inc. the core.
    Bob(but not THAT Bob), Oct 30, 2005
  11. Mine was worse on one side too, but definitely was the core - I think
    it's the dual climate control that causes uneven fogging.
    Bob(but not THAT Bob), Oct 30, 2005
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