[oldcarnut]

What is this hole in firewall,has a gasket around hole .It is behind the inner fender liner,drivers side .See picture.Nothing goes into it.

 

[RJV]

Ummmm. Is it important to know (i.e. what is the problem, or what are you trying to achieve), or is it purely an academic question?

If the former then members may make the time to research this and respond. If the latter, then ......

Some holes are used during the manufacturing process - e.g. to give once off access to a part, or to a bolt, and are then plugged. This might be one of those - I don't know.

Another explanation might be that there is an identical hole on both sides of the car. On a LHD car the hole on the driver's side is not used but on the passenger's side it is. And it's the reverse situation on a RHD car. That way MB only have to make one version of the relevant parts for both LHD and RHD cars, and fit a plug costing 5 cents to the unused hole.

Here is a photo of the identical hole (plugged) on the driver's side of my RHD car .... so opposite side to yours. Some weeks ago I was in search of a component of the anti-theft alarm system which is supposed to be installed here (if the car has this option fitted). This hole may or may not have something to do with this - I don't know.

 

[oldcarnut]

Firewakk hole

Thanks RJV,
Somebody was working in this area before me,probably took out plug.
But why would there be a gasket there?WE will just plug it..


Thanks:http://www.benzworld.org/forums/images/smilies/smile.gif

 

[trollking]

I have seen the same hole on my truck. In my case, it has a plug which looks like it is going to fall off... I can feel cold air blowing on my feet no matter what the position for the hot air is. I have the feeling that this is the body access plug which costs around $3 (PN 110-987-09-44) and it has something at least partially to do with the cold air in my feet. I am going to replace it and put rubber glue around it, sometime during the Christmas holidays. I will post an update if replacing it lowered or completely took care of the cold air issue.

 

[copper_90680]

Duct tape it first to see if it get rids of the cold air, then replace it!

 

[mattml430]

I would think it would be hot air coming through the fire wall. Looking at it it's next to a heat shield.


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[trollking]

I can feel the cold air only in the winter when the outside temperatures drop below 35 F. But the cold air might be due to the poorly designed air vent at the feet, as mentioned on some previous posts here on the forum. It is till the old design installed on my truck.

Copper 90680, thanks for the suggestion! Didn't think of using something as simple as duct tape but it makes sense to try it! I will put some over the long weekend.

 

[springerfever]

Duct tape it first to see if it get rids of the cold air, then replace it!

I find it extremely gratifying to actually use DUCT tape for making some type of duct repair !!