Foggy Windows???
Evolving Member
Joined: Apr 2007
Posts: 103
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From: Central, New Jersey
Rainx makes an interior anti-fog thing, it's like regular rainx but for the inside. works really well!! Its fading now and my windows are starting to get foggy again, but I put it on almost 2 months ago, last a while.
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Why is it that the A/C helps defrost? I've noticed my Porsche leaves it on even when its 30ish degrees outside and i have the temp set at 80. I figured it had to do with that, I've just never been able to figure out why.
Also, to the OP, the BIG thing for fogging up your windows is grimy windows, like was said before. Second is gonna be moisture stuck in the air system when you shut off the car (if its a "right when you turn on the car" thing). Third would be air filter. Fourth would be that you're just panting too damn hard.
Also, to the OP, the BIG thing for fogging up your windows is grimy windows, like was said before. Second is gonna be moisture stuck in the air system when you shut off the car (if its a "right when you turn on the car" thing). Third would be air filter. Fourth would be that you're just panting too damn hard.
Fog is condensation... condensation is moisture in the air changing states due to drastic temp differences between inside/outside.
If it's cold outside and warm inside, you'll get fog inside... Run the AC (most defrost settings use AC compressor) because the AC acts as a dehumidifier and takes moisture out of the air... it will also cool the windows so there is not such a drastic temp differences.
If it's cold inside and warm outside, you'll get fog outside... Use the wipers and/or turn on the heat
If it's cold outside and warm inside, you'll get fog inside... Run the AC (most defrost settings use AC compressor) because the AC acts as a dehumidifier and takes moisture out of the air... it will also cool the windows so there is not such a drastic temp differences.
If it's cold inside and warm outside, you'll get fog outside... Use the wipers and/or turn on the heat
Newbie
Joined: Mar 2004
Posts: 49
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From: Southern California
Window fogging is a very common problem. Over the past 5-10 years, defrost designs have made this problem more common.
You have three sources of water for condensation on your car windows.
Water collected on the A/C evaporator and the inside surfaces of the housing from the last time you had your A/C on (for cooling or defrost)
Water droplets from the outside on a rainy day being pulled in through the vents or openned windows
Wet people / stuff in the car
1) Cleaning the windows well make it more difficult for water to condense on the window. What worked for me is to first clean the windows with glass cleaner, then I wipe down the windows with a mixture of .5 Gal distilled water and a couple of drops of ivory dish washing detergent.
2) Turning the A/C on will dehumitify the air in the car. However, the A/C evporator will collect some water and will dump some of this water back into the air in the car the next time you start your car unless you have the A/C or defrost turned on again.
I try to dehumitify the car in the morning by turning the heater control to almost halfway between defrost and heat but a little toward heat. The EVO 8 is designed to turn-on the A/C when the heater control is turn toward defrost. It would be nice if we had the option to turn on the defrost without turning on the A/C.
You could also try to dry out a wet evaporator by running the fan on high with the A/C or defrost off for about 5 min near the end of your drive before shutting off the engine.
3) Try to minimize the amount of wet stuff in the car. Try not to track too much water in and don't open the windows in the rain.
Also, be safe, if your windows are fogging up, turn on the defrost. section 2 above is for longer-term moisture management.
You have three sources of water for condensation on your car windows.
Water collected on the A/C evaporator and the inside surfaces of the housing from the last time you had your A/C on (for cooling or defrost)
Water droplets from the outside on a rainy day being pulled in through the vents or openned windows
Wet people / stuff in the car
1) Cleaning the windows well make it more difficult for water to condense on the window. What worked for me is to first clean the windows with glass cleaner, then I wipe down the windows with a mixture of .5 Gal distilled water and a couple of drops of ivory dish washing detergent.
2) Turning the A/C on will dehumitify the air in the car. However, the A/C evporator will collect some water and will dump some of this water back into the air in the car the next time you start your car unless you have the A/C or defrost turned on again.
I try to dehumitify the car in the morning by turning the heater control to almost halfway between defrost and heat but a little toward heat. The EVO 8 is designed to turn-on the A/C when the heater control is turn toward defrost. It would be nice if we had the option to turn on the defrost without turning on the A/C.
You could also try to dry out a wet evaporator by running the fan on high with the A/C or defrost off for about 5 min near the end of your drive before shutting off the engine.
3) Try to minimize the amount of wet stuff in the car. Try not to track too much water in and don't open the windows in the rain.
Also, be safe, if your windows are fogging up, turn on the defrost. section 2 above is for longer-term moisture management.
Last edited by stanimal8; Oct 27, 2007 at 07:17 AM.
Thread Starter
Evolved Member
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Joined: Oct 2005
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From: Newport News, VA
Window fogging is a very common problem. Over the past 5-10 years, defrost designs have made this problem more common.
You have three sources of water for condensation on your car windows.
Water collected on the A/C evaporator and the inside surfaces of the housing from the last time you had your A/C on (for cooling or defrost)
Water droplets from the outside on a rainy day being pulled in through the vents or openned windows
Wet people / stuff in the car
1) Cleaning the windows well make it more difficult for water to condense on the window. What worked for me is to first clean the windows with glass cleaner, then I wipe down the windows with a mixture of .5 Gal distilled water and a couple of drops of ivory dish washing detergent.
2) Turning the A/C on will dehumitify the air in the car. However, the A/C evporator will collect some water and will dump some of this water back into the air in the car the next time you start your car unless you have the A/C or defrost turned on again.
I try to dehumitify the car in the morning by turning the heater control to almost halfway between defrost and heat but a little toward heat. The EVO 8 is designed to turn-on the A/C when the heater control is turn toward defrost. It would be nice if we had the option to turn on the defrost without turning on the A/C.
You could also try to dry out a wet evaporator by running the fan on high with the A/C or defrost off for about 5 min near the end of your drive before shutting off the engine.
3) Try to minimize the amount of wet stuff in the car. Try not to track too much water in and don't open the windows in the rain.
Also, be safe, if your windows are fogging up, turn on the defrost. section 2 above is for longer-term moisture management.
You have three sources of water for condensation on your car windows.
Water collected on the A/C evaporator and the inside surfaces of the housing from the last time you had your A/C on (for cooling or defrost)
Water droplets from the outside on a rainy day being pulled in through the vents or openned windows
Wet people / stuff in the car
1) Cleaning the windows well make it more difficult for water to condense on the window. What worked for me is to first clean the windows with glass cleaner, then I wipe down the windows with a mixture of .5 Gal distilled water and a couple of drops of ivory dish washing detergent.
2) Turning the A/C on will dehumitify the air in the car. However, the A/C evporator will collect some water and will dump some of this water back into the air in the car the next time you start your car unless you have the A/C or defrost turned on again.
I try to dehumitify the car in the morning by turning the heater control to almost halfway between defrost and heat but a little toward heat. The EVO 8 is designed to turn-on the A/C when the heater control is turn toward defrost. It would be nice if we had the option to turn on the defrost without turning on the A/C.
You could also try to dry out a wet evaporator by running the fan on high with the A/C or defrost off for about 5 min near the end of your drive before shutting off the engine.
3) Try to minimize the amount of wet stuff in the car. Try not to track too much water in and don't open the windows in the rain.
Also, be safe, if your windows are fogging up, turn on the defrost. section 2 above is for longer-term moisture management.