[Buster Blue]

My front windscreen has been misting up today and found it hard to control to remove it. however it came back after a while once removed, any ideas why.

Thanks in advance.

[robbiep]

At a guess, pollen filter is in need of changing (if it gets damp then all the cabin air, which goes through it, gets very damp too). Could just be due a change, or the housing might not be fully sealed.
Alternatively, you might have water ingress elsewhere. Feel all the carpets (including in the boot/wheel well area) for dampness.

[Kal101]

Water leak in the heater matrix but would smell of anti freeze

Or have you simply used the air con recently can sometimes mist up after that

Occasionally find if been exercising hard can must up badly as well.

[Buster Blue]

Originally Posted by robbiep

At a guess, pollen filter is in need of changing (if it gets damp then all the cabin air, which goes through it, gets very damp too). Could just be due a change, or the housing might not be fully sealed.
Alternatively, you might have water ingress elsewhere. Feel all the carpets (including in the boot/wheel well area) for dampness.

Good point re pollen filter, is it easy to check and change? never looked.

Cheers

[Buster Blue]

Originally Posted by Kal27

Water leak in the heater matrix but would smell of anti freeze

Or have you simply used the air con recently can sometimes mist up after that

Occasionally find if been exercising hard can must up badly as well.

It was raining for most of the day and had been getting in and out frequently.

[Kal101]

Originally Posted by Buster Blue

It was raining for most of the day and had been getting in and out frequently.

More than likely that's why then. You bringing in all that damp.

[Watsey]

Are you using the zircon ? If not, try leaving it on continuously in damp weather. Not wishing to preach to the choir, the aircon works by cooling and drying the air then (depending on the temperature set for the car interior) heating it prior to it entering the cabin.

In my E46s I've found that setting the recirculation function to "on" is effective at drying the cabin air more quickly.

[HighlandPete]

Originally Posted by Buster Blue

My front windscreen has been misting up today and found it hard to control to remove it. however it came back after a while once removed, any ideas why.

Thanks in advance.

I assume you are running the A/C all the time and not in recirculation mode.

HighlandPete

[335i nthehouse]

I have found in many cars recirculation set to on excessively causes this.

My f30 is on auto though and has never suffered - what setting you using ?

[Buster Blue]

Originally Posted by 335i nthehouse

I have found in many cars recirculation set to on excessively causes this.

My f30 is on auto though and has never suffered - what setting you using ?

I'm lazy I use auto

[Buster Blue]

Had not been using the AC it was set to auto never use re circulation.

[teaston]

Originally Posted by Buster Blue

Good point re pollen filter, is it easy to check and change? never looked.

Cheers

It's in the passenger footwell behind the panel below the gearbox.

Just remember to reconnect the 12v socket when you put it back!

[snipnoob86]

yes recirculatiin is the worst for steaming up as it effectively recirculating any moisture, made worse also by carrying passengers.

the pollen filter is a good shout but also bare in mind condensation is created when warm moisture meets a cold surface so adjusting the fans to counter the imbalance when its raining is not uncommon in any car

[ukbeemerboy]

Originally Posted by Buster Blue

Had not been using the AC it was set to auto never use re circulation.

If your not using the A/C then that is why its misting up. Leave A/C on all year around and this will cool and dry the air preventing misting up.

[Notechy]

I got in wet yesterday and car steamed up a lot. A/c did clear it but I feel that it does so more slowly than on the previous series 3.

[HighlandPete]

Originally Posted by ukbeemerboy

If your not using the A/C then that is why its misting up. Leave A/C on all year around and this will cool and dry the air preventing misting up.

^^^^ Was going to be my next comment.

There are the options to try the MAX button for a quick clear, or the Screen button. MAX will be automatically include the A/C function, whereas Screen will only include the A/C if already on.

Unless the A/C is switched on, there is no way to identify if there could be a HVAC fault, as misting in wet conditions can be all over the place if just using Auto with A/C deactivated.

HighlandPete

[HighlandPete]

Originally Posted by Notechy

I got in wet yesterday and car steamed up a lot. A/c did clear it but I feel that it does so more slowly than on the previous series 3.

Current HVAC systems are designed to be more efficient in energy use, ECO-PRO settings being a good example of cutting back to a minimum.

Also the way we set it up, what intensity we run, will also affect how quickly we get heating/cooling/demisting.

HighlandPete

[Buster Blue]

Originally Posted by teaston

It's in the passenger footwell behind the panel below the gearbox.

Just remember to reconnect the 12v socket when you put it back!

Is that because it causes an annoying rattle you are unable find!!!!

Thanks Teaston.

[Buster Blue]

Originally Posted by HighlandPete

^^^^ Was going to be my next comment.

There are the options to try the MAX button for a quick clear, or the Screen button. MAX will be automatically include the A/C function, whereas Screen will only include the A/C if already on.

Unless the A/C is switched on, there is no way to identify if there could be a HVAC fault, as misting in wet conditions can be all over the place if just using Auto with A/C deactivated.

HighlandPete

Spoken like a true H&V Engineer.

Thanks Pete

[FillUpAtTheBlackPump]

Also check whether you're using Eco-pro mode with the eco ventilation option selected in iDrive.

I've found this really limits the demisting ability