W203 Water in driver's footwell

[colinallcars]

As above - any suggestions as to where it could be coming from? I've checked that the drainage holes on the scuttle under the wipers are clear.

 

[markjay]

Other possible culprits are:

Leaking windscreen seal - has the windscreen been replaced in the past?
Faulty door seals
Leaking sunroof seal (if you have one)
Leaking heater matrix - do you also have coolant lose? coolant smell in the cabin?
(On some cars there is a rubber plug hole at the bottom of the floor, which can leak, though I don't think MBs have them)

 

[Littledigger]

I have the same problem in mine, but where do i start checking the heater matrix?

 

[markjay]

I have the same problem in mine, but where do i start checking the heater matrix?

If the heater matrix is leaking you will have some coolant lose in the header tank, plus possibly coolant ('antifreeze') smell in the cabin.

 

[Littledigger]

If the heater matrix is leaking you will have some coolant lose in the header tank, plus possibly coolant ('antifreeze') smell in the cabin.

So it's a matter of checking all the hoses inside the car for leaks, taking out bits of the dash, glove box etc.?

 

[markjay]

So it's a matter of checking all the hoses inside the car for leaks, taking out bits of the dash, glove box etc.?

Depending on the specific model, it is usually a case of removing the entire dash to gain access the heater matrix and find the exact source of the leak... it could be a hose, but it could also be the heater matrix itself.

But first you need to establish that it is actually coolant that you have in your car, not rainwater....