Anybody have tricks for preventing windshield fog up? (engine, heater, cars)

[Checkered24]

Is this for on the inside of your window? If so, it sounds like you have water leaking in somewhere, and moisture is collecting in the car.

[stan4]

I have had so few problems with foggy windshields in the last ten years, I honestly was beginning to wonder of the car makers had done something to fix it.

[plmokn]

Originally Posted by Checkered24

Is this for on the inside of your window? If so, it sounds like you have water leaking in somewhere, and moisture is collecting in the car.

Or, the moisture condenses after the temperature drops at night.

[NewHavensFinest]

Ive used Fog-X, which is for the inside of the glass...

It works slightly, but it really doesnt do anything.

I think if you block off the air vents that run on the dash, that will stop any condensation.

I usually just roll down my window, but it stinks to do this because my glass will usually get fogged in the rain.

[DanBev]

For me simple,I use Ac and turn on heat,doesn't take much heat and doesn't affect comfort
Switch to windshield defrost,defog control.This keeps all windows clear.

[delta5ply10]

if you have a vent keep it in the open position

[Gimme3steps]

Switch your control from recirculate to outside fresh air. Makes a difference.

Also a bad seal between the body and the windshield will cause it to fog up, front or rear.

[Retriever]

Originally Posted by Gimme3steps

Switch your control from recirculate to outside fresh air. Makes a difference.

I can't even begin to count the number of people I have helped over the years by simply pointing out to them that they had their HVAC system set on, "recirculate", when they were using the heat or the vents. For some reason, a lot of people seem to operate their vents on recirculate most of the time, and this just exacerbates the fogging problem.

Personally, I find that comfort and the ability to see through the windshield trump gas mileage, but, if the OP insists on not using his A/C, then he should make sure that his power vents are not being operated with recirculated air.

[weltschmerz]

Originally Posted by theunbrainwashed

I hate it that every time there's a bit of humidity here and the temperature drops, whether it's night time or before, during, and after rain, my windshield frequently fogs up and I have to turn the A/C on to defog it. Anybody have any homemade tricks that would prevent my windshield from fogging up so easily?

Turn the heat on, not the AC. It works.

[greg42]

Would note that most/all cars that have a "Max A/C" setting anywhere in the controls activate the recirculation during that setting. And some may not deactivate it when you move it away from that setting, depending upon how the controls work. You definitely can't keep the recirc on and expect it not to fog up in those conditions. Just not going to work.

It shouldn't fog constantly, although some weather conditions can certainly be stubborn like that. I have times where I've had to leave the defog on for a while, with the A/C. Better than alternative, even if it cuts the mpg a little. It shouldn't cut it by more than 1 or 2 mpg.

Is this a pretty small car/small cabin? With 35 mpg I would think so. I'm sure that makes it worse/more likely to fog up.

Also, make sure you note when the condensation is instead on the outside. I've had it fool me for a few seconds now and then. Looks like inside fog but is actually wet on the outside!