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Thread: How long should the windscreen take to demist?

  1. #31
    Underutilized Member shadonoz's Avatar
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    Quote Originally Posted by wow400 View Post
    Yup, the A/C comes on ok.
    I was thinking about inability to get rid of moisture too - assuming the A/C works as it should, there shouldn*t be much inside the car. The A/C is on all the time so should get rid of dampness from shoes / breathing etc.
    I wonder if the car has been correctly programmed from its shipping settings?

    I have a horrible feeling that the only way I*ll be able to prove there is a problem is to get out there one cold morning and film it from startup to 75% clear. That*ll take about 20mins!
    Time lapse, if you can.

  2. #32
    Registrierte Benutzer Chris_Top_Her's Avatar
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    Sometimes plain heat works better than running the ac.

  3. #33
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    Quote Originally Posted by shadonoz View Post
    Time lapse, if you can.
    Genius!!

  4. #34
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    What a surprise, the dealers say there is nothing wrong with the cars (they’ve had a few complaints) and it’s just due the cars taking a long time to heat up

    Apart from saying the car is unfit for purpose and could be argued as dangerous, is there anything else we can do?

  5. #35
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    Apparently, according to the dealer, there is a *valve* that actually shuts off heat to the car in order to heat the engine up. So to actually disengage that and demist you have to rev it it.

    Anyone else heard something like this?

  6. #36
    Underutilized Member shadonoz's Avatar
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    Quote Originally Posted by wow400 View Post
    Apparently, according to the dealer, there is a *valve* that actually shuts off heat to the car in order to heat the engine up. So to actually disengage that and demist you have to rev it it.

    Anyone else heard something like this?
    He's probably describing the thermostat. It shuts off coolant flow, which keeps hot water from reaching the heater core.

  7. #37
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    No, that was what I thought too.
    Apparently there is some other valve!
    If it was the stat, I could swap it out with one that opened earlier :-)

  8. #38
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    From Mazda customer services this morning:

    I*m sorry to hear of the concern with the way the CX-5 clears the windscreen in the car. I have spoken with our technical team for further advice. The information provided by the dealership is correct. The vehicle has a coolant control valve for emissions, which is closed at idle. If the car is left on a driveway idling, then it will not demist as no hot coolant is circulated to the heater. This is normal operation of the vehicle.

    As expected - no fault found!!

    So how are you meant to demist a windscreen without driving it if the only way to open the valve is to drive it?
    Can*t beat these circular arguments ��

  9. #39
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    Quote Originally Posted by Chris_Top_Her View Post
    Sometimes plain heat works better than running the ac.
    Almost always in my case.

  10. #40
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    Quote Originally Posted by wow400 View Post
    From Mazda customer services this morning:

    I*m sorry to hear of the concern with the way the CX-5 clears the windscreen in the car. I have spoken with our technical team for further advice. The information provided by the dealership is correct. The vehicle has a coolant control valve for emissions, which is closed at idle. If the car is left on a driveway idling, then it will not demist as no hot coolant is circulated to the heater. This is normal operation of the vehicle.

    As expected - no fault found!!

    So how are you meant to demist a windscreen without driving it if the only way to open the valve is to drive it?
    Can*t beat these circular arguments **
    I just live dangerously.

  11. #41
    Registered Member banjos-n-beer's Avatar

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    Is the car driveable in this condition? Meaning, can you see out of it? Maybe a pic to help explain your dilemma?

  12. #42
    Resident barbarian ColoradoDriver's Avatar
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    Quote Originally Posted by Unobtanium View Post
    Almost always in my case.
    Agreed.
    2014 CX-5 Touring AWD | Jet Black Mica - 77k miles
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  13. #43
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    I too have suffered long de-misting times on icy UK mornings. My new CX-5 Nav+ Sport 2.2D can take 10/15 minutes to clear the windscreen inside. I was advised by colleagues at work that some cars shutdown the air-con when temperatures are low. I don*t know if that is true in this case?

    What is more annoying is that the screen starts of clear, then 5 minutes after I drive away I have to pull over as I can no longer see. Then there is a long wait for the screen to clear.

    I*ve never had a car that behaves like this...

  14. #44
    Resident barbarian ColoradoDriver's Avatar
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    You all lost me. Anytime my windshield fogs up when it's cold outside, I have to put the dial to the windshield one, and use heat.

    Works everytime and stays clear...if I keep that setting running.
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  15. #45
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    This is my first winter with my 2018 GT. It is the worst vehicle as far as demisting goes. With the blower on a medium setting it only clears a very small section in the middle dash area, and on high it takes the engine forever to warm up. I live in Canada and with -18C this morning I finally scrapped the inside of the windshield after about 10 minutes of idling. I even tried the Meguiar's Anti-fog. spray and that did absolutely nothing.

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