Heated rear window slow to clear

lynall · 12-11-2008, 08:31 AM

Very slow in fact i timed it this morning and i had done 10miles in 15mins and it was still less than 50% clear then next time i looked it had switched off timer i guess.

Does anyone elses take as long as this?

Wife says her W203 is also very slow.

Lynall

Frank O' Phile · 12-11-2008, 08:46 AM

Not wishing to cast aspertions on your personal hygiene habits, but is the rear screen clean on the inside? A clean screen clears quicker.

p.s. I assume there are no breaks in the elements.

kwakdonut · 12-11-2008, 10:06 AM

If you switch your A/C on or use the manual fan with the temp up high, this helps. Mine cleared within 5 minutes this morning with both front and rear de-misters on.

BTB 500 · 12-11-2008, 12:50 PM

It's very slow on my SL, and many other SL owners have made the same comment.

I would hazard a guess that it's to do with the elements being inside the glass, rather than on the surface. Hence the glass has to be heated from the inside out, rather than the surface layer (where the condensation is) being heated directly.

The downside of having the elements on the surface is obviously that they can be damaged relatively easily.

lynall · 12-11-2008, 08:26 PM

Glass is all clean well ish

am running with a/c on at the moment full time.

Last car a disco had heated front and rear, front would clear ice in about 3 mins and the rear wasnt far behind.

Makes it really difficlut to see what the car behind you is and more importantly are there any lights on the roof

.

Will clean all glass again weekend as the front seems to be a bit grubby even though cleaned a few weeks ago, just remembered the newspaper trick.

Ps no breaks in elements top 3 or 4 dont wotk but i think they are radio aerial or similiar

Pps elements are on the inside surface of my rear screen.

Lynall

12-11-2008, 08:31 AM	#1
lynall Hardcore MB Enthusiast Join Date: Jul 2008 Location: Kent Car: The silver one. Posts: 3,146	Heated rear window slow to clear Very slow in fact i timed it this morning and i had done 10miles in 15mins and it was still less than 50% clear then next time i looked it had switched off timer i guess. Does anyone elses take as long as this? Wife says her W203 is also very slow. Lynall

12-11-2008, 08:46 AM	#2
Frank O' Phile Hardcore MB Enthusiast Join Date: Mar 2008 Location: Derbyshire Car: Merc of course. 300E Posts: 783	Not wishing to cast aspertions on your personal hygiene habits, but is the rear screen clean on the inside? A clean screen clears quicker. p.s. I assume there are no breaks in the elements. __________________ my motor

12-11-2008, 10:06 AM	#3
kwakdonut Hardcore MB Enthusiast Join Date: Jul 2006 Location: Swindon, Wiltshire - yuk Car: W211 E320 CDi Avantgarde, Kawasaki z650 Posts: 1,364	If you switch your A/C on or use the manual fan with the temp up high, this helps. Mine cleared within 5 minutes this morning with both front and rear de-misters on. __________________ New baby.... W211 2003 E320 CDI Avantgarde Gone but not forgotten....2002 C270 CDI Avantgarde Gone and forgotten!...1999 Peugeot 406 Estate 2.0 GLX

12-11-2008, 12:50 PM	#4
BTB 500 Hardcore MB Enthusiast Join Date: Aug 2005 Location: Bracknell, Berks Car: '97 R129 SL500, '07 Vito 120 Dualiner Long, '96 Audi A4 TDi 110 SE Avant Posts: 9,542	It's very slow on my SL, and many other SL owners have made the same comment. I would hazard a guess that it's to do with the elements being inside the glass, rather than on the surface. Hence the glass has to be heated from the inside out, rather than the surface layer (where the condensation is) being heated directly. The downside of having the elements on the surface is obviously that they can be damaged relatively easily. __________________ . *Bill* click images for gallery pics SL500 - Brilliant Silver, AMG exhaust, AMG split-rims Vito 120 Dualiner Long - Jasper Blue, 204 bhp, 440 Nm, de-badged .

12-11-2008, 08:26 PM	#5
lynall Hardcore MB Enthusiast Join Date: Jul 2008 Location: Kent Car: The silver one. Posts: 3,146	Glass is all clean well ish am running with a/c on at the moment full time. Last car a disco had heated front and rear, front would clear ice in about 3 mins and the rear wasnt far behind. Makes it really difficlut to see what the car behind you is and more importantly are there any lights on the roof . Will clean all glass again weekend as the front seems to be a bit grubby even though cleaned a few weeks ago, just remembered the newspaper trick. Ps no breaks in elements top 3 or 4 dont wotk but i think they are radio aerial or similiar Pps elements are on the inside surface of my rear screen. Lynall Last edited by lynall; 12-11-2008 at 08:29 PM.

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