Dust on the rear windows, ventilation

[Optimist]

Hi all!

As I try to be a good memeber I meanwhile have squared eyes by trying to find a thread that discribes my actual problem.
I failed and so, I open a new one.
If anyone has a link to a thraet the following has been discused before please inform me. Thanks.

My actual prob:

2 weeks ago I got a new main fan ( the second in cars life) but I still have problems with moisture in my car.

My mechanic check with his computer and says that the flap, that closes when you switch ventilation to indoor only (e.g. whenn you drive throu a tunnel or when you dont want other faulty smells from outside in your car) does not open completely (only 1/3)
The effect, he sais, is, that the moistured air in the car cant get out.
The freaky thing ist, that he is able to open an close the flap with his computer completely. But the computer of my car does only open it 1/3 or close ist complete.
My mechanic said: "Strange! And I dont know how to fix .I will think over.Use A/C so far as often as possible on full power."

Great

Has anybody had that before?

Did any dealer clear that problem?

Would be nice to get the repair for low becuase of me telling my mechanic how to fix


Thanks for help!

[Werner807HDI]

Sorry, I never heard about this. And I unfortunately have no idea to help you!

[aroone]

Hi Stephan,

Just one question: is your A/C switched ON? Auto mode is ON?

In my 807 A/C is always ON (Auto mode), and I newer had any problems with misty windows. My P206SW has mechanical A/C, thus I switch it on when I really need it (high humidity, raining or when its hot) and I definitelly can say, that chances for windows to mist is much more higher, when A/C is switched off.

Some time ago, I left 807 at my dealer's backyard for cleaning A/C. After that operation, foreman mentioned, that they where unable to clean it fully, because inner circulation's flap closed automatically and this flap was not reacting into switching corresponding button on a console, because of big difference of outer and in car set temeperatures. So, as I understand, if this flap in your car opens and closes by using diagnostic computer, it might be everything OK and according to current temperature settings, climate control just opened inner circulation's flap to 1/3?

Arunas

[Optimist]

Hi aroone!

No, I don't use A/C every time. I only turn it on, when its actually misty (during autumn) or hot (in summer) in my car, leave it on as long as it takes to clear up windows or to get temprature down and then switch it off again.A/C causes high fuel cosumtion, so I do not use it all time.
But I do so since 2005 when I bought my Ully an neverhad that prob before.

Anyway... may be you are rigth. I' l give it a try and reply results.

[Werner807HDI]

Originally Posted by Optimist

Hi aroone!

No, I don't use A/C every time. I only turn it on, when its actually misty (during autumn) or hot (in summer) in my car, leave it on as long as it takes to clear up windows or to get temprature down and then switch it off again.A/C causes high fuel cosumtion, so I do not use it all time.
But I do so since 2005 when I bought my Ully an neverhad that prob before.

Anyway... may be you are rigth. I' l give it a try and reply results.

The same for me, I have the same use and no problems at all!

[Optimist]

So, now I tried out for a while and find that I have to drive WITH A/C if I want to have clear windows.
My garage says they still dont know the prob and want to exchange the motor of the inner circulation flap and if that does not fit they want to change the whole controlpannel.
Both versions are much expensive, so I will drive with a/c until I find another solution.

Not really "zufriedenstellend".

[davidwfaulkner]

You really need to leave the A/C on all the time - it will only actually "run" when it needs to, that way within a few minutes you will have de-humidified (dry) air entering the car and, as you correctly found, the windows will not mist up.

When you turn the A/C off , all the moisture that has collected on the condenser will be released into the car as damp air and the windows will mist up again very quickly.

I have checked very carefully with all the cars I have owned with A/C and despite what you may read, with a big engine (>1300cc) the fuel consumption will rise by maybe only 1 or 2 miles per gallon which is a small price to pay for the benefit of ALWAYS having clear windows - and a cool car !

I leave mine set to AUTO which operates the A/C when it is needed and I never have misted up windows - even with 6 people and a big dog in the car, even when it is raining or cold outside.

If I should turn it off accidentally then within a few minutes the windows are all misted up, I turn it back on and they clear and stay cleared.

Leave it set to auto and you will see.

[Peter1]

[Optimist]

Well... you are right.
Leaving on A/C on AUTO keeps windows clear.
But it hasnt been so before! So, why now??

And what about the innercirculation flap? Why does it open only 1/3? Do your flaps behave that way to?

As werner807 said he doesnt need to keep his A/C running! That shows, that keeping windows clear works WITHOUT A/C also.

Maybe you have the same fault like me and dont know it?

[FuliHdi]

Originally Posted by davidwfaulkner

I leave mine set to AUTO which operates the A/C when it is needed and I never have misted up windows - even with 6 people and a big dog in the car, even when it is raining or cold outside.
If I should turn it off accidentally then within a few minutes the windows are all misted up, I turn it back on and they clear and stay cleared.

Hi,
I do not agree. I drive 9 months / 12 without A/C and have almost never misty windows.! The 2 - 3 times a year this happens is always in winter (entering the car after sports) and I de-mist the windows very simply just with the fan & warm air, A/C switched off.

[aroone]

I think, it might depend on the geografical location and climate in that zone. E.g. here in my country, during winter season, recently we have quite a high humidity outside, while in the Alps region the air is much more "dry". This factor also influences a lot mist-"ification" of windows.

[Peter1]

Originally Posted by Optimist

My mechanic check with his computer and says that the flap, that closes when you switch ventilation to indoor only (e.g. whenn you drive throu a tunnel or when you dont want other faulty smells from outside in your car) does not open completely (only 1/3)
The effect, he sais, is, that the moistured air in the car cant get out.
The freaky thing ist, that he is able to open an close the flap with his computer completely. But the computer of my car does only open it 1/3 or close ist complete.
My mechanic said: "Strange! And I dont know how to fix .I will think over.Use A/C so far as often as possible on full power."

Can't judge this - never checked how the flaps in my EV2(s) behave(d).

Fact is, that when it's cold and humid like now, at least in the morning I've the A/C on which will clean the windows reasonably quickly.

Most of the time however I've the A/C on ("auto") - maybe except when it's really freezing outside - I never cared about it.

Specially during this kind of weather (cold, humid) combined with 6 (sometimes 7) people in the car, without A/C it's kind of difficult to get the (rear) windows clean - on short distances.
As soon as I do a trip of, let's say, one hour, I think the car's heating system will blow enough of warm, dry air into the interior which will get the windows clear, too.

(But because it appears to be better for the aircon system to keep it running all the time, I normally do so)

[davidwfaulkner]

Yes, IF you never switch the A/C on then the condenser radiator will stay dry and the extra condensation won't happen, but you will still get condensation if it is cold / damp outside.

LEAVE IT ON !!!!

Where exactly is the flap that only opens 1/3rd - I will check mine and see where it sits.

[Optimist]

Hi davidwfaulkner!

I am sorry, but I dont know where exactly this flap is. I treid to find on my sparepart CD and on the Technical Manual CD, but didnt manage.

My garage figured out the missbehaving of my flap by using their examiner.

So perhaps your garage should do so too?