Screen - Excessive moisture

I find that if the temperature drops quickly overnight the inside of the screen gets misted up, often so much so you can almost see water pellets on the inside ....

my aircon is on all the time
 
I sometimes get moisture in the passenger footwell .... no idea where its from but condensation off the aircon system is my guess, but who knows

i only know this because I have rubber mats protecting the carpet - so I think I wouldn’t know this if I had carpets

its not related to rain , that I do know

pretty much given up with VW now as the van is out of warranty ...
 
I think the idea that its because of the insulation seems the most logical

One way to disprove it is if it happens to someone that hasn't insulated thier van??
 
Wow, this thread grew quickly, I was going to suggest you reach behind the carpet up under passenger side for damp. Just in case you had wiring put through the grommet behind the battery as sometime fitters use the wrong grommet and push the roof drain grommet in by mistake.
 
And as another condensation issue most of us board, insulate and carpet over the rear low level ventilation through the rear quarter floor.
 
I also get quite a bit of condensation especially on cold nights. I don’t have roof bars and am fairly confident I don’t have any leaks. I also don’t use the Van week to week so I just assume it’s normal. My van is also fully insulated and carpeted. If it’s very bad I just wipe it off the screen and ventilate a little. I would not worry too much if there are no obvious signs of leaks.
 
Dave Mac said:
And as another condensation issue most of us board, insulate and carpet over the rear low level ventilation through the rear quarter floor.
Click to expand...
Yes, it did cross my mind when I was carpeting the panels. I'm going to review my build photos although the lower panels will pop back off (but not without messing with the bed etc). Maybe it's an idea to fit a proper grill behind a cupboard to allow air to move instead of getting a dirty shadow appear in the carpet.
 
Loz said:
Wow, this thread grew quickly, I was going to suggest you reach behind the carpet up under passenger side for damp. Just in case you had wiring put through the grommet behind the battery as sometime fitters use the wrong grommet and push the roof drain grommet in by mistake.
Click to expand...
I think I will Loz just for piece of mind. I've done the work myself and tried to be respectful to the van as I hope to keep it years. Fortunately I've documented by photo virtually everything I've done in it or to it.

Some great experience and lateral thinking from you guys. Thanks :)
 
Dave Mac said:
And as another condensation issue most of us board, insulate and carpet over the rear low level ventilation through the rear quarter floor.
Click to expand...
Do you mean the slam vents in the rear quarters?
I had holes drilled into mine when I replaced the oem boards with ply and I still get the condensation?

20201222_201734.jpg
 
As I wrote earlier insulation and lining the van are probably the main reason but this is only my opinion.
 
It may just be the time of year and cold outside temperature. I just wondered if it was a common issue across the vans. When I get the chance, I'm still going to pull it apart and have a good look round as rot is the last thing I want.
 
I'm not too worried about the rot as they are galvanised bodies so shouldn't be a problem
It's the fact of having to wait for windscreen to clear before setting off the bothers me, I don't like to use a blade on the inside as it leaves smears
Might try leaving my door window open a crack tomorrow, I've got wind deflectors so they will still look closed and my work has a secure car park
 
I would try parking the other way round just to see if it makes a difference, just a thought
 
It is weird....our 107 does this, (we used to have a door seal issue which is now solved but still does it!) but our Passat, our camper and my Sprinter never does.
I've bought one of those condensation bags for the camper for when we sleep in it but have not used it in there yet.....maybe ill try it in the 107, although its not really the 'cure' I wouldn't of thought.
 
I think the condensation bags are a good idea and somewhere I have some unopened pots left over from a couple of yrs ago. I've just been back out to the van and its raining but warmer than last night. No signs of misting at all on the inside. There's got to be some physics going off here :laugh:
 
DXX said:
Try using this tool

Dew Point Calculator

This free dew point calculator calculates dew point, relative humidity, or air temperature if given any of the other two values.
www.calculator.net www.calculator.net
Whatever you attach to the van if it’s surface temperature is below the dew point for the internal air temperature / relative humidity it will allow condensation.
Ultimately ventilation and heating is key in the colder months, avoiding using gas hobs will also help as burning LPG produces water.
Click to expand...
 
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