Question about 1998 Toyota Sienna

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Foggy windows in 98sienna

Im having problems with fog on the windows with hot air some times i cant even see

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  • fortines Dec 24, 2008

    is the fog on the windows

  • fortines Dec 26, 2008

    thank you for helping mi with this no body mention the heater core they always said it was the cabin air filter so i changed it and it kept doing the same so i think ill take it to the dealer since AC unit is on the way. thanks again

  • s60six May 11, 2010

    is the fog on the windows or does the vehicle fill with fog?

  • yadayada
    yadayada May 11, 2010

    is the heater core leaking perhaps?

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  • 63 Answers

Thats a heater core leak.Shop around and get an estimate.

Posted on Dec 24, 2008

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Why do the windows on my 2009 caravanfog uponce Istart todrive?The windows will beclear after I warm it up but once I start drive they fog up.I do not smell antifreezeand the heater core lookslikenew.


windows fog up on the inside simply because of the hot breath of the occupants
this heat is cooled by the screen and condenses and so a fog is created
simple physics really - hot moisture + cold air =rain to over come this quickly run the air conditioner ( climate control) and that takes the moisture out of the air in the car and then the windscreen clears
you are going to say that it is too cold for the ac to run well at the same time run the heater until you have a pleasant temperature that is dry ( climate control--when it gets too hot the ac cuts in and when it gets to cold the ac switches off BUT the moisture that causes the fog on the windows is gone )

Nov 11, 2015 | Cars & Trucks

1 Answer

My buick rendezvous, the rear and back windows keep fogging up even with the heater on and rear heat on. I'm not a technical guy so I really need help with this. If people are inside, it fogs up, if the...


That's not unusual if you have a lot of people in the car. I will fog up because the glass is colder then the warm moist air hitting it, so the water condenses on the glass. Two ways to solve this issue. First open the windows a small amount to get rid of the warm air and introduce some cold air. OR second, set your defroster from full hot to slightly on the cool side with air circulation from the outside as well (i.e blend air as opposed to only cabin air)..

Mar 21, 2015 | Buick Rendezvous Cars & Trucks

1 Answer

Windscreen keeps misting when car is parked


Is it fogging up when you use the heat or a/c? Is it fogging up after sitting outside on a particularly dewey night?

An easy fix and one to try first is turning the temperature gauge over toward heat, and setting the directional controls to defrost. Up the power on the blower for a moment. The warmer air will usually clear up a foggy windshield in seconds on a chilly or even not-so-chilly morning. The condensation on the glass needs a change of temp in order to evaporate. Sometimes you can get the same effect by using outside air to circulate through your car's blower system. Most have a way of circulating either inside-car air, or outside-car air.

If the glass fogs when you're driving down the road and have the heat on, or the a/c - do you smell something sweet or see white smoke coming out of your air vents? If so, you could have a faulty heater core. I wouldn't imagine this is the problem on such a new vehicle, but it could still malfunction.

Of course, if you're trying to wipe this fog clean and it won't go away, maybe you've got someone smoking in the car and leaving a film on the glass. It would take a lot of smoking to make the windshield look foggy though.
from China OBD2 car diagnostic tools wholesale on CareUCar

Feb 15, 2014 | Cars & Trucks

1 Answer

Turn off heater blows hot air


the windows are fogging up from the water vapour inside the car hitting the glass and freezing. All the heater is doing is making the water vapour evaporate into smaller particles and freezing quicker. The way to overcome this is to dehumidify the air in the car (take the water vapour out). To do this use the AC as this is what it is designed to do . run the heater at the same time and the glass will clear and stay clear. In most cars this is called climate controlled air conditioning.

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2 Answers

Foggy windows


I have a Toyota and they are not good at fog. go to parts store and rained makes a product fog x easy to apply you apply on the inside its about5 bucks or less it works

Dec 10, 2013 | Toyota Cars & Trucks

1 Answer

Icing up windows


try running the ac as well as the heater. The ac removes the humidity (water vapour) in the air in the car which is causing the fogging up . Hot moist air on glass creates fog ( same as clouds). You will get a comfortable temperature inside without the fog

Dec 07, 2013 | 2007 Chrysler 300

1 Answer

Windows fog up


Heated air in large quantities is what gets rid of window fog. Make sure you're actually getting hot air out of the dashboard vents, and if not, follow that problem.

Dec 29, 2012 | 1995 Subaru Legacy

2 Answers

How do I keep my car windows from getting foggy?


on your heater control you should have a selection button for outside air or recurlate this is useley a arow curcle or strate the strate arow is the one you need to use

Dec 31, 2009 | 1998 Honda Civic

1 Answer

Foggy windows


It may be set to recirculate the inside air, this is indicated by a symbol of a car with a swirling arrow inside, the button will be in with the climate controls. always use outside air if it is cold or raining and you will avoid fog

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3 Answers

Windows fog up,small anti-freeze smell


not a home mechanic job trust me ,garage this one .you could try another radiator sealer though might help or some mustard powder about 2 tablespoons

Dec 22, 2008 | 2001 Honda CR-V

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