The 230CE is coming along well. The 5-speed was worth the effort. The cruise
control works most of the time. The AC is almost ready to fill I just have
to add one more fitting. The power windows are nice.

As I am driving it more on thing is frustrating me: With the windows up it
is difficult to close the door. It often does not close right the first try
and I have to open it ant push hard to get it closed. If the passinger
window is open, the drivers door closes nicely. The problem is I'll slam the
door if the a window is open because I am used to a harder push when the
windows are up.

I tried to check the vent outlet for blockage but I can't find a path for
the air to go out. I can only guess that the air must flow out the hole
around the rear upper seat belt mount.

Any Ideas?

Thanks

Commuter schrieb:
I think the air is going down between rear window and cover in full
width of the car. There is an flat air duct below in the trunk to the
outlets on both C-columns. The manifold is in danger of rusting through
to the window frame in older cars.

--

Roland Franzius

I removed the trim on the rear deck and you are right that is the way it
works. There is a small gap between the trim piece and the window. There is
no blockage that I can see. If I remove the first aid kit and open the
trunk, the doors close nicely. I wonder if they did not correct for the
larger doors of a coupe and not provide for more air flow. Do sedans have
this problem? I rode in a BMW that when the door is opened the window opens
a bit then goes up when the door is closed. This prevents the problem that I
am having. I may design a circuit to do this on my car.

I alwys wondered if they still called it a C-column (pilar) even though this
is a "Pillarless Coupe" and there is no B-column.

Thanks for your response.


"Roland Franzius" <roland.franzius (AT) uos (DOT) de> wrote

Commuter schrieb:
The sudden pressure rise is best seen with a convertible when slamming a
door is blowing up the hood.

Suddenly closing one door in a tenth of a second adds perhaps 50 liters
of air to the inner of the car.

Newtonian air flow physics and the look at the convertible tells you the
time to reach pressure equilibrium again is greater than a second.

So for the reaction force the air ducts have no significant effect
during the closing time. An open sunroof or partly opened window will
have.

The compression ratio of the passenger cell volume is something like
50 l /10000 l making a net pressure of 50 mbar or 500 kg/square meter.

The door surface of perhaps 1/4 square meter has to overcome a force of
roughly 125-250 kg.

--

Roland Franzius

Commuter ha scritto:
Yes, that BMW window strange behaviour helps to prevent the problem that
you have wih your Mercedes. But the reason is different: on the BMW it
avoids crushing the capote (the fabric of the roof).

I'd suggest to check below the doors and on the two sides of the rear
seats, if there are any air passages closed by leaves, dust, dirt, etc.

Bye-bye. Stefano from Italy

Cordy schrieb:
The SLK has the feature of open windows during closing the doors since
2000. Probably people have complained because of the ear shock.

--

Roland Franzius

As does my CLK Cabrio. Window drops slightly then rises again after closing
the door. I think that's mainly to ensure the door and roof fabric don't
'tangle'.

BTW, very occasionally the window drops a lot and won't close properly. The
official fix is to fiddle about in a certain way with the window control...

DAS

To send an e-mail directly replace "spam" with "schmetterling"
---
"Roland Franzius" <roland.franzius (AT) uos (DOT) de> wrote

[...]

Since the power window circuit is engerized when the drivers door is opened,
my new circuit will be fairly simple. Probably one 555 timer, one relay and
a few resisitors and capacitors.

After removing the first aid kit, I realised that the trunk closes eaiser
too if the doors are open. There is not much I can do about this.

"Dori A Schmetterling" <nobody (AT) spam (DOT) co.uk> wrote

Commuter wrote:
Mercedes W140 Coupes do this too.

There is vent flaps in the trunk. On W126, it is located in the side pockets
in the trunk toward the spare tire There should be a hole and a rubber flap
on each side. Pretty big oval hole.

I am wondering if someone replaced those side pockets as a possibility of
rust. Without this vent, your AC won't work well either... there got to be
some vent to prevent building up pressure as you drive faster.