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[Marks DTM Calib]

Not sure I subscribe to the "lets air back out" theory ... but I will agree that a blocked pollen filter will cause misting ... my theory is quite simply that the blocked filter restricts fresh air intake, so is like having the recirculating system selected. This increases relative humidity and so causes misting.

At the end of the day its a damn great big vent into the car, and if its blocked and not letting air in or out, its going to cause the windscreen to mist up inside

Air will always take the passage of least resistance.....in order to get air through a pollen filter you need a dirty great big fan with a big fat power supply (ala the blower motor)......not much air going to get back out even with the fan stopped.

Reality is that pretty much no air will get in or out once parked up.

As for moisture, if the aircon has been operational, there will be a nice wet evaporator sat inside the cabin which will donate plenty 

[Andy B]

Not sure I subscribe to the "lets air back out" theory ... but I will agree that a blocked pollen filter will cause misting ... my theory is quite simply that the blocked filter restricts fresh air intake, so is like having the recirculating system selected. This increases relative humidity and so causes misting.

At the end of the day its a damn great big vent into the car, and if its blocked and not letting air in or out, its going to cause the windscreen to mist up inside

Air will always take the passage of least resistance.....in order to get air through a pollen filter you need a dirty great big fan with a big fat power supply (ala the blower motor)......not much air going to get back out even with the fan stopped.

Reality is that pretty much no air will get in or out once parked up.

As for moisture, if the aircon has been operational, there will be a nice wet evaporator sat inside the cabin which will donate plenty 

Is that a long winded way of say that Tunnie was   wrong?     

[Ian_D]

Not sure I subscribe to the "lets air back out" theory ... but I will agree that a blocked pollen filter will cause misting ... my theory is quite simply that the blocked filter restricts fresh air intake, so is like having the recirculating system selected. This increases relative humidity and so causes misting.

At the end of the day its a damn great big vent into the car, and if its blocked and not letting air in or out, its going to cause the windscreen to mist up inside

Air will always take the passage of least resistance.....in order to get air through a pollen filter you need a dirty great big fan with a big fat power supply (ala the blower motor)......not much air going to get back out even with the fan stopped.

Reality is that pretty much no air will get in or out once parked up.

As for moisture, if the aircon has been operational, there will be a nice wet evaporator sat inside the cabin which will donate plenty 

Is that a long winded way of say that Tunnie was   wrong?     

What again, nah never 

[Andy B]

....
What again, nah never 

I thought not! 

[mrjimbo]

Does the Estate have the vent in the rear offside like the saloon ?

[Mr Hagon]

Never thought one of my posts would see so much activity  .

Scuttle drain was indeed blocked previously which I sorted myself with some twin and earth and numerous scrapes to my forearm (too lazy to remove the pollen filter).

In any case I have now replaced the pollen filter (it was a lovely shade of dirty grey) and this appears to have improved matters.  In turn it seems that the climate has responded well to this and now throttles back on Auto when the desired cabin temp is reached, rather than sitting there blasting away all the time.

I will check the boot to ensure that there's nothing blocking the vent there...and use some Autoglym car glass polish on the inside of the windows when it's warmer to remove any dirt and smears that remain.

[Andy B]

....
(it was a lovely shade of dirty grey)  .......

Pollen filters for later cars were carbon ..... and they are grey!       

[tunnie]

and very expensive compared to pre-facelift ones 

[Richard A]

Always run with the 'aircon' on in damp/cold conditions as it dry's/dehumidifies the air prior to it entering the cabin space - fact (per GM) 

regards
richard a

[Mr Hagon]

....
(it was a lovely shade of dirty grey)  .......

Pollen filters for later cars were carbon ..... and they are grey!       

I stand corrected, but due to the scuttle overflowing it did have quite a bit of detritus hanging off it.

[Mr Hagon]

and very expensive compared to pre-facelift ones 

£16.50 retail from a stealer...

[Mr Hagon]

Always run with the 'aircon' on in damp/cold conditions as it dry's/dehumidifies the air prior to it entering the cabin space - fact (per GM) 

regards
richard a

Always do, never had need to turn on ECO, and if I was worried about fuel consumption then I wouldn't be running a V6  .

[tunnie]

and very expensive compared to pre-facelift ones 

£16.50 retail from a stealer...

Yeah, pre-facelift ones are about £4!

[Andy B]

and very expensive compared to pre-facelift ones 

£16.50 retail from a stealer...

Yeah, pre-facelift ones are about £4!

Pollen filters
All models to '99    93182438            £8.65   £7.77    £6.22

 
All models from '00     93165208       £16.50   £14.86   £12.12

[steve2.5cd]

inspect the pollen filter and check the scuttle drain, likey the pollen filter has had its day, and no longer letting the air back out again.

Did this today and what a smelly, shitty job it was. and yes, i think the pollen filter has been in since the car was made in 98 ! lol