steamy window

xantiaman · 22nd September 2011, 19:07

hi all
when i put my air con on to demist the windscreen it clears as it should,however if i use the econ to demist my windscreen it has the opposite effect and steams the window right up,any ideas why?obviously i can avoid this by always using the air con but i dont always want to.thanks

Dashiel · 22nd September 2011, 20:25

check the void between the bulkheads.
the famous bit where the plenum drains are.
check there is no water there and that the pollen filter is dry.
get rid of any leaves kicking around here too.
then have a general check for water and damp leaves kicking around in that general area where the plenum covers are.

jcwatrichmond · 23rd September 2011, 07:33

When the air-con is in use, on Auto, it has a drying effect on the incoming air, even if it isn't cooling the cabin due to the temperatures set. When the Econ button is pressed then this doesn't happen as the air-con is switched off. When you're driving in wet weather and experiencing misting it pays to keep it in Auto to dry the air.
As JohnLan says, check that the pollen filter iis dry.

JCW

wuzerk · 23rd September 2011, 07:43

XANTIAMAN: You have your answer and you know it makes sense. We do not know which model of 75 you have so could you add that to your 'handle'.
If you have a diesel then having the air con on barely alters the MPG if that is what you are worried about.

Dave Goody · 23rd September 2011, 08:45

The air is probably on recirculate as well which will tend to mist up the screen. Push the recirc button to switch off, Dave

xantiaman · 23rd September 2011, 17:50

profile amended.its not so much the fuel consumption im worried about but the annoying noise the heater fan makes on a/c that it doesnt make on econ.i have read on this forum that the a/c pump is the culpret but im afraid that while it is working and providing nice hot cabin air i will be leaving it alone for the time bieng.thanks for the replies.

COLVERT · 23rd September 2011, 20:35

I have had several cars that developed a small water leak in the heater matrix which made the screen mist up.

Colvert.

22nd September 2011, 19:07	#1
xantiaman Avid contributor ROVER 75 SALOON 2.0 v6 connoisseur Join Date: Dec 2010 Location: corsham Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	steamy window hi all when i put my air con on to demist the windscreen it clears as it should,however if i use the econ to demist my windscreen it has the opposite effect and steams the window right up,any ideas why?obviously i can avoid this by always using the air con but i dont always want to.thanks

22nd September 2011, 20:25	#2
Dashiel Posted a thing or two Rover 75 V6 2.0 Club Tourer LPG Join Date: Apr 2011 Location: South East Posts: 1,405 Thanks: 3 Thanked 39 Times in 34 Posts	check the void between the bulkheads. the famous bit where the plenum drains are. check there is no water there and that the pollen filter is dry. get rid of any leaves kicking around here too. then have a general check for water and damp leaves kicking around in that general area where the plenum covers are. Last edited by Dashiel; 22nd September 2011 at 20:27..

23rd September 2011, 07:43	#4
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	mist XANTIAMAN: You have your answer and you know it makes sense. We do not know which model of 75 you have so could you add that to your 'handle'. If you have a diesel then having the air con on barely alters the MPG if that is what you are worried about.

23rd September 2011, 08:45	#5
Dave Goody This is my second home 15 years of 75s & ZTs now an XTrail Join Date: Nov 2006 Location: Danbury, Essex Posts: 3,761 Thanks: 18 Thanked 88 Times in 56 Posts	The air is probably on recirculate as well which will tend to mist up the screen. Push the recirc button to switch off, Dave __________________ ZT 190 X Power Grey The Only Colour is this Dark Silver!! When I was a kid I was scared of earwigs because I thought they actually lived in your ears. I was even more terrified of cockroaches!

23rd September 2011, 07:33	#3
jcwatrichmond Loves to post Rover 75 1.8T 2003 Club SE Join Date: Jan 2009 Location: Solihull, Posts: 370 Thanks: 0 Thanked 0 Times in 0 Posts	When the air-con is in use, on Auto, it has a drying effect on the incoming air, even if it isn't cooling the cabin due to the temperatures set. When the Econ button is pressed then this doesn't happen as the air-con is switched off. When you're driving in wet weather and experiencing misting it pays to keep it in Auto to dry the air. As JohnLan says, check that the pollen filter iis dry. JCW

23rd September 2011, 17:50	#6
xantiaman Avid contributor ROVER 75 SALOON 2.0 v6 connoisseur Join Date: Dec 2010 Location: corsham Posts: 136 Thanks: 0 Thanked 0 Times in 0 Posts	profile amended.its not so much the fuel consumption im worried about but the annoying noise the heater fan makes on a/c that it doesnt make on econ.i have read on this forum that the a/c pump is the culpret but im afraid that while it is working and providing nice hot cabin air i will be leaving it alone for the time bieng.thanks for the replies.

23rd September 2011, 20:35	#7
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	I have had several cars that developed a small water leak in the heater matrix which made the screen mist up. Colvert.