I always thought foggy windows was just inherent in the design of the older hondas. The cars aren't well insulated against the outside weather, especially when humidity is high (raining) and it's cold outside, they are smaller (and less well-vented), and they all have extreme sloped windshield profiles that are very close to the driver/passengers' faces (and breath). (Newer hondas' windshields are farther away from our head space I notice, and bigger, and better insulated, and have better venting design).
Operating the heater actually is counter-productive; the reason the windows fog up is because the air outside is cold, which makes the glass cold, and the warmer air (and increased moisture from your breath) on the inside of the glass condenses against the cold surface bleeding in from the outside surface of the glass. So while operating the heater may seem to "melt" the fog away, actually, at first, it helps make it worse (by creating a larger disparity between inside temp and outside temp), and then only melts the fog away near the bottom of the glass closest to the vents, leaving you to end up wiping the rest of the glass with your hand anyway.
I live in Washington Tacoma/Seattle area, where it rains a lot. I have found, actually, that the best way to get rid of the foggy glass, sadly, is to use fresh vent air (not recirculated), and turn the temp to COLD. Scientifically speaking, this makes sense, because now the air temp inside the car more closely matches the outside air temp, thereby avoiding the condensation of warmer air as it comes into contact with the cold from the outside of the glass. While you get fogless windows, sadly, it means it's cold inside. brrrr.
For a quick DEfog, I roll down one of the rear windows and open up the sunroof while blowing cold outside air out of the windshield vents. The fog goes away in a few seconds, and then I close the windows. Keeping the cold fresh air goin prevents it from fogging back up after that.
I've had the same problem with all the other hondas I've driven, civics and preludes.
Operating the heater actually is counter-productive; the reason the windows fog up is because the air outside is cold, which makes the glass cold, and the warmer air (and increased moisture from your breath) on the inside of the glass condenses against the cold surface bleeding in from the outside surface of the glass. So while operating the heater may seem to "melt" the fog away, actually, at first, it helps make it worse (by creating a larger disparity between inside temp and outside temp), and then only melts the fog away near the bottom of the glass closest to the vents, leaving you to end up wiping the rest of the glass with your hand anyway.
I live in Washington Tacoma/Seattle area, where it rains a lot. I have found, actually, that the best way to get rid of the foggy glass, sadly, is to use fresh vent air (not recirculated), and turn the temp to COLD. Scientifically speaking, this makes sense, because now the air temp inside the car more closely matches the outside air temp, thereby avoiding the condensation of warmer air as it comes into contact with the cold from the outside of the glass. While you get fogless windows, sadly, it means it's cold inside. brrrr.
For a quick DEfog, I roll down one of the rear windows and open up the sunroof while blowing cold outside air out of the windshield vents. The fog goes away in a few seconds, and then I close the windows. Keeping the cold fresh air goin prevents it from fogging back up after that.
I've had the same problem with all the other hondas I've driven, civics and preludes.
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