Question about 1998 GMC Blazer

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Car dosnt de-mist it fogs up instead

When it came back from the machanic, the de-mister blew moistured air on the windscreen instead of proper air, do you think those arse-holes put the hoses on the wrong way

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Its possible it should be obvious to see though if that was the case. you should take it back to them but im happy to try to help

Posted on May 25, 2008

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Why does my kia picanto 2013 windscreen totally mist up and will only clear when i put ac on hwen it clears i turn ac off then within seconds it mists up again


the windscreen fog is from humid air coming in from the outside
air conditioners work by removing the humidity from the air so if you close of the outside vent then the recirculated air inside the cabin eventually has all the moisture removed
that is why the windscreen clears because there is no moist air to condense on the cold windscreen
now you will say that it is too cold and that is why you turn it off
well try this -- leave the ac on and adjust the heater control to produce lukewarm air no fogging up and not cold
it is called climate control

Jul 19, 2016 | Kia Cars & Trucks

1 Answer

Air vent schematic


air for the inside of the car comes from the vent at the base of the windscreen or is recirculated inside the car
if you see what appears to be mist, fog or smoke from the ac vents ,it is extra cold air from the ac system that is seen as fog when it hits the air in the car
you will know exhaust fumes by the smell

Nov 18, 2015 | AC Cars & Trucks

1 Answer

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

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

3 Answers

In cold weather the inside of all the windows keeps misting up


the fresh air door is stripped at the motor, jaguar has a bulletin, about glueing .....works for a while,
long term fix replace heater plenum assy......
Or rig the door to stay in a midpoint postion, access below the pollen filter

Jan 08, 2010 | 2002 Jaguar X-Type

2 Answers

Mercedes c180 1995 new windscreen- problem with de-fogging


IF THE WINDSHIELD FOGS UP YOU HAVE MAY A LEAKING HEATER CORE, THE SLOPPY INSTALL WOULD BE IRRATATING BUT NOT THE CAUSE ANY FOGGING

Jul 16, 2009 | 1992 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

Jeep '99 Mist from AC vents?


It would seem that your a/c is working very well. You most likely live in an area that is high in humidity. When the cold air from your a/c hits the moisture saturated air from the environment it turns the moisture to fog "condensation" . That is most likely your mist. Hope this helps. Good luck.

Jun 11, 2009 | 2000 Jeep Cherokee 2WD

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