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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-02-2012, 03:45 AM   #1
Robaidh
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Angry windscreen misting up all the time

hi guys i know im going to get a slagging for asking such a silly question but its driving me NUTS!!!!


my windscreting keeps misting up unless i have the demisting blower on all the time, this means i roast! but if i crak the window open that does the trick but then im fine but everyone else in the car gets cold a moans. i replaced the pollon filter in the hope that maybe thats what was causeing it but it hasnt solved it. Any ideas on what it could be?

thanks
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Old 12-02-2012, 04:02 AM   #2
cityjohn
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Any ideas on what it could be?

thanks

Humidity and condensation. If switching on the defroster automatically turns up the fan and heat, try this: Set the controls to manual not auto, turn on the AC compressor and set the heat to a mid position like 23 degrees or so. Set the fan to a medium level.

The effect of the air conditioner will dry the air and keep moist air from accumulating on the inside of the cold glass, which is what's causing all the misting.
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Old 12-02-2012, 04:29 AM   #3
Robaidh
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Hi thanks for the the quick reply, yeh i have to turn the wind screen de mister on and set the fan to a low power and the heat as low as it will go 16 degrees celcus, but it gets to hot! So i have to crack the window open, could it be the seal on the windscreen gone?
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Old 12-02-2012, 04:46 AM   #4
Parabola
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I have the same problem.. was considering the pollen filter but not now that it didnt seem to do anything for you. I do have a suspicion with why mines mists up - the seal around my driver door isnt tight at the top, so when it rains moisture gets in the door (the metal part not inside the actual car) this has also caused a little bit of rust on my inner door . But the moisture in there may also be evaporating and causing my window to steam up.. maybe you also have this problem?

The seal round the top of my driver door is kinda bent in one area.. not too sure how to even fix that without replacing the whole thing.

Last edited by Parabola; 12-02-2012 at 04:47 AM.
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Old 12-02-2012, 04:53 AM   #5
Robaidh
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Hi

Yh thats maybe why yours isnisting up, i noticed that the rubber seal on my door shut is getting past its sell by date if you know wat i mean? Im wondering if this is maybe why or the rubber seal round my window but it looks in good nick.
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Old 12-02-2012, 05:00 AM   #6
jfoj
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You likely have moisture getting in the car somewhere.

Check the floor carpet for dampness.

Search sunroof drain (assuming you have a sunroof) and door vapor barrier.

If you have a 4 door car it is HIGHLY likely your rear door vapor barrier(s) is(are) leaking. The rear door vapor barriers AUTOMATICALLY leak after 6-7 years.

The front door vapor barriers can leak, but not as often.

Also if you have had any work inside the doors, this is a likely place to check for leaks as well.
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Old 12-02-2012, 07:43 AM   #7
Robaidh
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hi.

mine is a coupe, i have noticed that the rubber seal on the drivers door shut is pretty nackered maybe this coule be why? but if this was the case would it not be the same as me cracking open my window to let cold air in?
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Old 12-02-2012, 09:16 AM   #8
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Find the wet carpet and you will likely solve your problem!
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 12-02-2012, 12:19 PM   #9
Robaidh
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if i find a wet bit of carpet does this mean an exspensive fix?
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Old 12-02-2012, 12:41 PM   #10
TT330i
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I get a similar problem, windshield doesn't mist up but many times during the summer I will go out to my car after work to find it's the only one that is all fogged up inside. There is not enough water for carpets to be wet, but I suspect it's my vapor barriers. I just haven't gotten around to taking the doors apart yet. Probably won't until it gets warm out again either... Keep your AC on all the time and set your climate control for whatever you feel comfortable. The AC will just serve to dry the air.
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Old 12-02-2012, 01:17 PM   #11
Robaidh
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Okay but the problem is i aint comfustble driving the car unless im on my own, as i am one of these people that HATE being to warm. So i just drive with my window down a little, other wise i have to put the demister on and put the temp as low as it will go 16 degrees which means i am WAY to hot and sweating. Nasty i know but if i turn the AC on will i not burn alot extra fuel?
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Old 12-03-2012, 08:53 PM   #12
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If you have a 4 door car it is HIGHLY likely your rear door vapor barrier(s) is(are) leaking. The rear door vapor barriers AUTOMATICALLY leak after 6-7 years.

The front door vapor barriers can leak, but not as often.
jfoj, is this really that common on sedans? If so I'll start there. Ironically in the last two days I started getting condensation on my rear windshield every time I park. I've had the rear windshield replaced several years ago and I've always wondered if they didn't seal it properly or if my vapor barriers are bad. Sometimes I get a lot of condensation back there but I'm not sure if that's because the leak is closer to that part of the car or if (more likely) that it's just always the coldest part of the car and any residual moisture condenses there first. Windshield has a lifetime warranty so I could have them reseal it I suppose. I even get creaking sounds on really cold mornings from the back that I think might be ice forming in some tiny crevices, but it's hard to tell.
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Old 12-03-2012, 10:55 PM   #13
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Rear door vapor barriers all leak after about 7 years. If window regulator has been replaced, even more likely.

Check rear floors and trunk for moisture.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Lower hose fan switch O-ring - BMW #13621743299
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Old 12-03-2012, 10:59 PM   #14
TT330i
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Any reason the rears go and not the front? My rear doors almost never get used, nor do my rear windows, never replaces regulators and carpets are always dry. Normally only get condensation on rear windshield
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Old 12-04-2012, 04:50 AM   #15
cityjohn
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Any reason the rears go and not the front?
I would guess that it may have something to do with the door shape and not the barrier's integrity. When I helped my buddy with his leaking 328, I sat in the back seat with the doorcards off while he ran a hose (no nozzle) along the outside. The dogleg seemed to funnel the water down to the area where it poured into the interior; but the square shape of the front doors may keep this from happening in front.
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Old 12-04-2012, 05:21 AM   #16
jfoj
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Rear doors are usually problems due to the design AND they rarely get used so water will not easily moved to help drain out of the door.

Also the doors being used more often may also keep the butyl more flexible??

If your car is parked in the summer and has condensation build up after sitting, you have a moisture problem somewhere.

Could with with AC drain, sunroof, door vapor barriers, also check the trunk and the rear fender wheel wells, poorly sealed replacement front or rear windshield can also be an issue.

You may not be able to feel the damp carpet, because the moisture may end up on the jute backing if the problem is in the cabin or front of the car.

Trust me, you have a moisture
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-07-2012, 01:11 AM   #17
raymoon
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I think my windshield cowl seal is leaking....I just washed my car, and an hour later, noticed my passenger footwell is wet....

Anybody know the part number for the Cowl Seal/Cover?
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Last edited by raymoon; 12-07-2012 at 01:59 AM.
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