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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 03-19-2017, 08:46 PM   #21
jfoj
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You are located in a rather wet region I assume.

Suggest if there is no rain forecast, pop the sunroof or barely crack a window overnight and the windows should not fog up as bad or at all.

If you really want to solve the problem, pull the rear seat bottom and put a humidifier in the car and close the car up and let it run for a 1-2 days.

This is only a short term solution to dry the car out, if the problem comes back, moisture is in the car.

As much as you think the door vapor barriers are properly sealed, these are usually the primary problem, followed by the half dozen other possible problems.
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Last edited by jfoj; 03-19-2017 at 08:47 PM.
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Old 03-19-2017, 09:54 PM   #22
tailendcharlie
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Appreciate the suggestion. It's puzzling. To recap - a lot of rain, for several days in a row. Go out in the morning, everything's soaked; car is dry inside windows are clear. Come out to the car in the afternoon after another cloudy rainy day, same deal; car's wet outside but dry inside with no fogging. Today's the first real sunny, mild day. Go out to the car in the morning, dry with no fogging. Go out for a afternoon drive, come home, park it in the sun. An hour later the windshield's fogged about halfway up.

Guess I'll pull the doors apart and check the vapor barriers again, out of ideas.
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Old 03-20-2017, 05:05 AM   #23
jfoj
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Open each door after a rain storm, if any door drains water near the front edge of the door, check the lower door jam to see if there is ANY water, if there is, this door likely has a door vapor barrier leaking.

There may be a door that had a window regulator replaced by a monkey that just cut the vapor barrier and it may need to be taped very well or replaced.

The majority of door vapor barrier problems tend to be with the rear doors because they get used far less frequently.
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

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

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-20-2017, 05:37 PM   #24
TobyB
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Quote:
pull the rear seat bottom and put a DEhumidifier
fixed that for you.

The trunk can leak, too, and water will get under carpet, battery, etc. It'll never be seen...
Taillights aren't nearly as prone as the E30, but can, and the seal can get torn or dislodged.

t
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Old 03-20-2017, 05:52 PM   #25
tailendcharlie
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Best solution - in this climate - is probably get my garage/carport built ASAP
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Old 03-20-2017, 06:52 PM   #26
jdstrickland
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Without regard to any leaks that might be present, if the windows fog up then the air is humid and you can turn the AC on to dehumidify the air and clear the windows. Turn the AC on and set the temp to the desired setting. The car will use the AC to dehumidify and will also supply hot water to the heater core to bring the temp up. Your breath is enough steam to fog the windows, especially if the recirc setting is selected. Humid air on cold glass makes fog. Your hot breath is humid, whether the car leaks water or not, your mere existence inside of the car is reason enough for a fogged window.

PUT THE AC ON. Holy cow!
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Old 03-20-2017, 07:43 PM   #27
tailendcharlie
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Originally Posted by jdstrickland View Post
Without regard to any leaks that might be present, if the windows fog up then the air is humid and you can turn the AC on to dehumidify the air and clear the windows. Turn the AC on and set the temp to the desired setting. The car will use the AC to dehumidify and will also supply hot water to the heater core to bring the temp up. Your breath is enough steam to fog the windows, especially if the recirc setting is selected. Humid air on cold glass makes fog. Your hot breath is humid, whether the car leaks water or not, your mere existence inside of the car is reason enough for a fogged window.

PUT THE AC ON. Holy cow!
This is getting boring but here goes - AC on, not in recirc mode. That isn't the issue; this occurs not in the morning or while driving rather after it has sat in the sun. You have hit on my original question - is this residual human-caused humidity or should I be concerned about hidden moisture, of which I can find no evidence.
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Old 03-20-2017, 08:36 PM   #28
jfoj
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Quote:
Originally Posted by tailendcharlie View Post
This is getting boring but here goes - AC on, not in recirc mode. That isn't the issue; this occurs not in the morning or while driving rather after it has sat in the sun. You have hit on my original question - is this residual human-caused humidity or should I be concerned about hidden moisture, of which I can find no evidence.
This is NOT residual human-caused moisture, this is a hidden moisture problem.

Carport or garage will help, but this is not a solution long term.

As for jdstrickland's suggestion. He does not understand what is going in, he lives in an arid environment. While the AC will held for the short term, it will not solve the long term problem.

Even installing a DE-humidifier to dry the interior out, if the source of the moisture is not found, the problem will return.

You can try some of these, they will help, but again they are not a solution.

https://www.amazon.com/Eva-dry-E-333...l+rechargeable
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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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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