Back window always fogged up

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deltron 21

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I don't know if im the only one with this issue, but my back window is always fogged up if the temp gets even a little cold, its completely fogged no other windows on the car do and no other cars in the parking lot, even ones that have been there since i park mine are fogged up. Just wondering and yes i after this happened a few times i cleaned my window and it made no difference
 
deltron 21 said:
I don't know if im the only one with this issue, but my back window is always fogged up if the temp gets even a little cold, its completely fogged no other windows on the car do and no other cars in the parking lot, even ones that have been there since i park mine are fogged up. Just wondering and yes i after this happened a few times i cleaned my window and it made no difference
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Check for water in the trunk! or damp carpet. My old 98 Talon use to do the same as temp get colder because rear gutter where not draining water properly!
And no! my rear window is not always fog in my Koup, but on rainny days I do have to keep ventillation on windows vent!

GL
 
Matemorh said:
Check for water in the trunk! or damp carpet. My old 98 Talon use to do the same as temp get colder because rear gutter where not draining water properly!
And no! my rear window is not always fog in my Koup, but on rainny days I do have to keep ventillation on windows vent!

GL
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I agree with Matemorh, there must be some water coming from the inside. I do not have that problem with mine.
 
Where I live it is very cold, 8 months of the year. I have no issues with my rear window fogging up, it is consistantly freezing up due to the obsurd temperature. Now I do have a concern with the front windshield, it seems it consistantly fogs up even sometimes with the front/feet option. Kind of odd. Also the auto function, still fogs up.. it is irritating.
 
Most new houses have issues with foggy windows...because everything is so insulated, the wetness is trapped inside.
Connection to cars here?

Dunno, maybe air it out a bit, check for water?
 
Good thinking ReKoup! lots of snow where I am from perhaps the melting snow from my boots is the problem. Seems logical to me.
 
no I'm not getting that either. do you have tint? if they apply tinting incorrectly(covering your rear window defroster wires) it can sometimes cause problems. maybe you could try one of the anti fog chems, though I haven't heard great things about them and I've never tried any.
 
I have the same problem deltron. I feel like I have to have the rear defroster on constantly. I'm always adjusting the heat in my Koup. It's either too hot or too cold or it fogs up, I can't seem to keep an even temperature in it.
 
Kenny C said:
The manual says that this can and will happen if the recirc is left on too long.
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Good catch Kenny C! OP are you using recirc air? It is well known that you should use outside air if you have high humidity (moisture) in the air.
 
I'm getting the same problem now. Probably from the snow falling inside the trunk and melting later. I used my defroster in the back, and got the water to bead up on the rear window...so I wiped it off before the car got cold again.

Products like No-Fog (From Rain-X) seem to help a little bit, but the glass has to be perfectly clean or you see streaks of a filmy substance when it tries to fog up.

I like to get my car nice and HOT in the winter then open the windows a bit. It makes me THINK im drying out the car, at least.

KoupCoupe said:
Good catch Kenny C! OP are you using recirc air? It is well known that you should use outside air if you have high humidity (moisture) in the air.
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Opposite effect for air conditioning (cooling) than heating, as recirc will cause humidity from people & nowhere for it to go: The recirc/AC is supposed to dehumidify the air - the evaporator core will condense water on it & drip to a drain (not sure on KIA if its a drain or not). Also, you should have the A/C on non-recirc until the air gets cooler than ambient temperature, then as soon as the air gets cold, turn on the recirc; you're dehumidifying the air and also cooling down cooler air from inside the car, rather than 90 degree hot air from outside (and bringing in humidity). Tiny bit better economy with this method.
 
One thing I noticed is that with the exaggerated slope of the rear window, that when it does fog up it becomes very difficult to see out even with the defroster on. Even with a clear window, I feel the Koup is a difficult car to back up in. I do remember this point being made in a online review somewhere. Anyone else share this thought?
 
KOUPKRAZY said:
One thing I noticed is that with the exaggerated slope of the rear window, that when it does fog up it becomes very difficult to see out even with the defroster on. Even with a clear window, I feel the Koup is a difficult car to back up in. I do remember this point being made in a online review somewhere. Anyone else share this thought?
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Never thought about that. Now that you say it, yes! VERY much so.
 
No issues backing up in my Koup, then again I drone tow truck for 2.5 years and didnt have a back window I could see out of most of the time anyways.
 
Sorry, I know this thread is old. My fiancé had an 02 rio, and now has an 09 sportage. I have an 09 spectra, with my dealer trying to find me the perfect koup sx! All 3 have had this problem. I have always assumed it had something to do with Kia lol.
 
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