All windows fog up ac drains?

[lynall]

Have noticed last week all my windows fog up and i have to run the a/c to clear once cleared all okay.

My wifes W203 C320 also does this.

On my last car a Landrover disco the common fault was the ac drain pipe blocked up, do the mercs do this as well?.

No water leaks into the car (unlike the disco )

Will be up on the ramp hopefully next week or so for bushs so any advice appreciated.



Lynall

 

[BlackC55]

Use the AC all the time to get rid of the moisture in the system. Moisture builds up on the evaportor and steams up the windows

 

[Dieselman]

Mine doesen't ever, irrespective of A/C use or not.

 

[Uberwagon]

Pop a dehumidifier in the car overnight on about 70%, you will be amazed at the amount of water in your interior. I had this problem in my W124 for a long while and this has cured it, hasn't happened in the 2 odd years since I did it.

Dave!

 

[rf065]

Pop a dehumidifier in the car overnight on about 70%, you will be amazed at the amount of water in your interior. I had this problem in my W124 for a long while and this has cured it, hasn't happened in the 2 odd years since I did it.

Dave!

Or you could just keep the air con switched on as it also dehumidifies the air.

Russ

 

[lynall]

Might just try the dehumidifier trick if my mate will lend it to me as he has got it in his camper van at the moment.


Ta
Lynall

 

[Uberwagon]

Or you could just keep the air con switched on as it also dehumidifies the air.

Russ

Would rather have it so that I didn't have to run air con all the time.

Dave!

 

[Smiley]

You need to change the pollen filters - I have had exactly the same problem on 2 different cars - one a Toyota (2 min job to replace but £50 for two filters) the other a W124 (couple of hours IIRC but about £20 again IIRC) - they get overlooked on servicing schedules.

The only other cause could be a leak into the car.

 

[Rory]

I'm in the "only use a/c when necessary" camp, and I've noticed on my W203 that if I turn the a/c off, it'll stay clear for a while, then suddenly mist up.

I deduce from this that the a/c doesn't turn off straight away, therefore my usual trick of turning off the a/c a couple of miles from home to dry out the evaporator, doesn't work.

 

[lynall]

New pollen filters fitted 8 wks ish ago.

I am running all this week with a/c on then go back to normal next week to see what happens



Lynall

 

[Dieselman]

Check for any water leaks in through the door seals. A car only steams up due to water trapped inside either due to the A/C drains being blocked or water entering elsewhere.

 

[travelininstyle]

I have a w203 c180 sports coupe and have experienced exactly the same problems as Rory - after running the a/c for about 10 mins fine,it suddendly misted up,so I turned a/c off and put blower on 22 degree setting to clear.I am still under mb warranty and yesterday was quoted £149.99 inclu.vat by a Manchester dealership for a full a/s service,including using a dye to check for leaks and full re-gassing ! - obviously I could go to kwik fit,or a garage specialising in a/c servicing and no doubt considerably cheaper than an mb dealership - but I am concerned that this might compromise my warranty and this was suggested by the mb warranty people when I mentioned it recently in a passing conversation.I suspect it might actually be a blockage on the a/c drain pipe,but I have occasionally had it happen when the fan is set to non-air con function - perhaps I should check for damp in the car - but it definately seems located around the area of the front facia/winscreen.If I am checking for damp in the car,I presume I lift the mats etc ? - any help would be appreciated.

 

[springer]

I have 2004 sport coupe, and my previous A4 had occassion to do this.

I have read and done that if you have a garage for the car leave the window open a little over night so that any warm moist air has the ability to escape.

If I remember rightly it cured it on the A4 but I haven't done this on the coupe recently . My memory seems to be letting me down.

Otherwise have sports coupe got a common problem?

Right to get back to the original problem it could the warm air is condensing on the cold body/interior parts ,windows closed the is effectively sealled and any moisture cannot escape.

Considering the weather we are having there should be many more cars like this.If your in and out of the car the water is comming in on your feet.

 

[lynall]

Sussed it:bannana: Dieselmans on the ball

Washed the car and was determined to find the cause of the problem stripped the boot out and there was a small amount of water in the spare wheel well and the wing space each side.

The cause? car has had a towbar at sometime that has been removed and the holes in the rear xmember where the bolts went through have been left open so when driving along water was getting onto the x memeber and running out into the boot, took me ages with the hosepipe to find it.

With the hosepipe under the car and aimed up behind the bumper you could just make out a small trail of water developing.

All 3 boot drains were also blocked with grit and dirt!

So at work last 4 m12 bolts and some grease and the holes are now sealed, just got to dry the boot out properly now


Lynall

 

[corned]

A/C drain holes

If you are getting misted windows and suspect that the a/c is not draining the condensate away properly, there is a very easy way to check this.

Go for a run of a few miles with a/c going, to get the system up to speed and have chance to take out some moisture from the air. Park up and leave the car for 5 or 10 minutes. If the ground under the car is dry, i.e. no puddle under the gearbox area, then you are blocked up. If there is a puddle, then water ingress somewhere is your next suspect. Or you have a leaky gearbox problem.

 

[lynall]

Update has been fine since boot dried out and old bolt holes plugged even with the damp mornings .



Lynall

 

[travelininstyle]

Air Con fogging and dampness.

Have noticed last week all my windows fog up and i have to run the a/c to clear once cleared all okay.

My wifes W203 C320 also does this.

On my last car a Landrover disco the common fault was the ac drain pipe blocked up, do the mercs do this as well?.

No water leaks into the car (unlike the disco )

Will be up on the ramp hopefully next week or so for bushs so any advice appreciated.



Lynall

I have been on the trail of this particular problem and thread for a few weeks now,as I am plagued by the same problem.After the MB Dealership used a disinfecting treatment,because of the damp,musty smell.Still having misting up problems,despite regularly running a/c to dry car/system out.Then,I ran the a/c all the way home from work,about 12 miles - parked the car up,on a dry garage floor and went back about 40 mins later - the floor was still bone dry,there was no evidence of the water condensing in a puddle onto the floor.Now as I took the car in after 3 weeks of buying the car - the gentlemen at the MB Dealership,kindly did the disinfection of the system gratis - as I brought the car on approved used,with extended MB Warranty - however - I am comming up to three months now and concerned they will treat this blockage as a service related issue and I will have to cough up - I will try to pursuade them to accept some mitigation,for not bottoming the problem the first time and they promised me no major bills within the first few months etc - even if they meet half the cost of a complete a/c service,I will be resonably happy - what would members of the forum advise ?

 

[lynall]

I cant see an a/c service making any difference, we have the machine at work and i have just done a few trucks with it and in a nutshell it pulls all the gas and oil out of the system does a vacuum hold test then puts the correct amount of gas and oil back in.

Using the old oil and the old gas and a little bit of new if its low which they usually are.

So thats roughly £100 for a piddly bit of oil and gas.

I would have a crawl about and find the drain pipes, as my last 2 cars used to leave puddles everywhere they were parked.



Lynall

 

[travelininstyle]

Thanks Lynall,

I have chased this particular problem for a while now and now I feel confident that the blocked drain pipes are the source of the problem and I will going back to MB in the next day or so,especially as this is the second night with aircon on - and no puddles - and you may have saved me wasting money on a service the car will not benefit from.Thanks

Alex

 

[lynall]

Sticking mine up on the 2 poster at work tomorrow to do the bushs so will have a look and see where mine are.



Lynall