Windshield defrost issues in cold weather

Discussion in 'Prime Main Forum (2017-Current)' started by Knowlegewalker, Jan 25, 2019.

  1. Knowlegewalker

    Knowlegewalker New Member

    Joined:
    Jan 25, 2019
    1
    0
    0
    Location:
    Ontario Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    Driving along after half hour of driving at 100km, suddenly the windshield fogs up completely. Air not on recirc. No fiddling with controls. It's cold outside.
    Driving in sub zero temp. Windshield will not fully clear in the inside. Any tricks for a fix or is my car not performing well? This is with the blower on full tilt for several hours.
     
  2. citiprius

    citiprius Active Member

    Joined:
    Dec 18, 2006
    178
    159
    51
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    May be you need to turn OFF the eco mode?
     
  3. jb in NE

    jb in NE Senior Member

    Joined:
    Apr 13, 2018
    2,235
    1,568
    0
    Location:
    Nebraska
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    It's a big windshield and I have found it can be tough to keep clear. One thing that helps is to thoroughly clean the inside of the windshield with a good cleaner like Invisible Glass. The off-gas from the plastic and other contaminants can leave a very thin film on the glass, providing a good place for condensation to stick.

    Another thing to try, in addition to turning off eco mode, is raise the temperature on the climate control.
     
  4. Spidey71

    Spidey71 Member

    Joined:
    May 16, 2018
    58
    48
    0
    Location:
    Alberta, Canada
    Vehicle:
    2018 Prius Prime
    Model:
    Premium
    We had the same issue because we were trying to use the defrost function on the touch screen. In cases of really cold weather this doesn't heat/defrost enough so you have to push the "front" defrost button (above the rear defrost button just to the left of the screen).
     
    benagi and frodoz737 like this.
  5. jb in NE

    jb in NE Senior Member

    Joined:
    Apr 13, 2018
    2,235
    1,568
    0
    Location:
    Nebraska
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    Good point. I assumed that was being used, but it may not have been the case.

    I drove through freezing rain a few weeks ago (about 75 miles) and had to stop and scrape the windshield every 10 miles or so. The defroster had no chance of melting the ice, which started at the top of the windshield and slowly covered the windshield until I had to slide down in the seat to see out. And that was with Rain-X on the glass.

    When I got home I had about an inch of ice on the front surfaces of the car.
     
  6. ed4271

    ed4271 Member

    Joined:
    Mar 4, 2017
    107
    63
    0
    Location:
    US
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Using the defrost button on the car right above the rear defrost that turns on the engine and you'll get the heat from the engine like a normal I.C.E. to clear off your windshield. Once the ice of snow is off your car turned off the defrost button and select in your heating settings defrost and feet. The heat pump should keep your windshield clear.

    Posted via the PriusChat mobile app.
     
  7. m8547

    m8547 Active Member

    Joined:
    Aug 8, 2018
    597
    350
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    The only thing that I can suggest is setting the temperature of the heat higher than you want it. If you set it for 68-70F, it might eventually start blowing cold air. If you set it for 76-80 you'll be super uncomfortable, but at least the windshield should stay clear. Open the windows if you need to cool off.
     
Loading...