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Registered 2005 SLK350
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Discussion Starter #1
So what's going on? I just got home and I had water (quite a bit of it) dripping out of the bottom of my car. It has to be water...it's definitely not oil or anti-freeze. It's kind of like in the summer when the air conditioner drips, but a lot more was coming out than that.

Here's the weird part. I changed by cabin filter today. Actually, I put one in, because when I went to replace it, there wasn't one in there to begin with. Did I do something wrong? Maybe that's why there wasn't one in the first place...I just don't know.

The temp was in the low 50's today, and I did just drive about 150 miles with the top down...but the heat going.

Does anyone have any thoughts?

BTW - the car is a '99 SLK 230 Sport with a manual transmission (if that matters)
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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you might have misaligned the water drip tube from the ac when you put the cabin filter in the passenger footwell. head back in there and check it out
but it does not make sense. more water with the heat on?
 

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Sadly Woolly has passed away
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. . . Actually, I put one in, because when I went to replace it, there wasn't one in there to begin with. . . .
Where were you looking - the 'upstream' side of the fan - there is no filter or grille fitted there (hence the frequent cases of faulty fans or noisy fans, due to it ingesting leaves, rats & small children) or did you go in on the 'downstream' side - through the passenger footwell - where it should be.
 

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Was A/C selected on? The A/C will continue to remove water regardless of temperature selected (it doesn't understand relative humidity).
Indeed. If the a/c is turned on it will remove water from the air regardless of the selected cabin temperature. However, at low 50'ies there is not much water in the air (around 15% of the amount on a hot and humid summer day) and this will normally only leave very small drips on the ground when you park, if any at all.

However, if your condensate drip tube (or whatever it is called) is clogged or bend so the condensate does not flow freely it will build up a reservoir that will empty out slowly when you park. The volume of such a reservoir will be independent of the outside temperature and humidity (provided that you drive long enough to fill it up - I think 150 miles will do the trick).

Another source could of course be the windshield washer fluid...
 

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Where were you looking - the 'upstream' side of the fan - there is no filter or grille fitted there (hence the frequent cases of faulty fans or noisy fans, due to it ingesting leaves, rats & small children) or did you go in on the 'downstream' side - through the passenger footwell - where it should be.
mine inhales sheep for breakfast... :burnout:
 

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Premium Member 2006 SLK350
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Better do a head count Woolly!

Well in our part of the world (Wisconsin/southern Ontario) it has been relatively humid due to Sandy et al and definitely cool.

Standing by on Woollmeister's question...
 

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Registered 2005 SLK350
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Discussion Starter #8
Where were you looking - the 'upstream' side of the fan - there is no filter or grille fitted there (hence the frequent cases of faulty fans or noisy fans, due to it ingesting leaves, rats & small children) or did you go in on the 'downstream' side - through the passenger footwell - where it should be.
It was through the passenger footwell. I decided to change my air filter and when researching I found out about the cabin filter...so I decided to to replace that too. I found a couple of good "how-to" and replacing it and again, when I pulled the door off where the filter sits, there was nothing up there.

I bought this car used about 3 years ago and continue to find "surprises". A great example...I found that my exterior antenna wasn't hooked up to anything. The wire had been cut and the stereo (an aftermarket one a previous owner installed) was hooked up to a metal antenna that was lying in the rear wheel well.
 

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If you replace the cabin air filter, this will not disrupt any drainage lines at all. The two drainage lines that are in the car are right behind the lower heater vents. To get these off you first have to take off the vent than behind that there is a Phillips screw. Than there will be one rubber L shaped connecters on each side that come from the heater core and drip straight out the middle of your car. Regardless weather you have the knob on hot or cold, the car will have the a/c on to take humidity out of the air unless you push the EC button. This could have been your problem.

(Refer to Figure 1-1) :tu:
 

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Registered 2005 SLK350
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Discussion Starter #11
Two additional things to note....
  • I did forget to mention that I had the windshield replaced two weeks ago...but I'm not sure if that would matter or not.
  • Also, this is the first real cold weather driving I've done in this car. I've been able to store it the last couple of winters, and so I've never driven it past Novermber 1st. Maybe this is something that always happens and I've just never noticed it before.
I guess as long as nothing is leaking and I'm not hurting anything, I can live with a little water.
 

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Registered 2005 SLK350
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Discussion Starter #12
I would give it a little taste to make sure its not coolant. The MB stuff is light blue. Are you sure its not coolant? Does it evaporate quickly?
Definitely not coolant...or oil. I didn't taste it..but it was clear, odorless with no texture. I have no doubt it was water.
 

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No kidding....That's the first I've ever seen that in cars! I'm really surprised....I ought to get some...its due for a flush. I might order some, I probably should do the coolant while I'm changing oil and putting in to eccentric cams for the suspension, since I already have it up on the lift.
 
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