C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Water leak behind transmission pan???

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Old Jun 11, 2015 | 02:17 AM
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2002 Mercedes C320 Wagon
Water leak behind transmission pan???

I have a 2002 C320, W203 Chassis, M112 engine with the 5 speed auto transmission and iv had a slow water leak for I dont know how long now. I could never find the leak. I decided to pull off the skid plates today and lo and behold it wasnt leaking from there. but from behind the transmission pan. There is a small hole up in the "tunnel"? where it was leaking from just above the flex disk for the drive shaft. Now it only leaks a small amount of water. I put about 3 hours of driving on it, Freeway and regular roads and it didnt lose a lot. Ill show pictures to where its leaking because I have absolutely no idea how its leaking from that area. The picture with the flex disk there is a small hole you can see, that is where the water is leaking from. There is another picture showing the mounting bracket for the transmission that has water dripping from it (blurry sorry) and then the picture where the water is leaking at. I dont even know how its possibly leaking water from back there... Any knowledge would help.
Attached Thumbnails Water leak behind transmission pan???-20150610_135829.jpg   Water leak behind transmission pan???-20150610_140439.jpg   Water leak behind transmission pan???-20150610_140305.jpg  

Last edited by krispycam; Jun 11, 2015 at 02:20 AM. Reason: more pictures
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Old Jun 11, 2015 | 04:19 PM
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pcy
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
Are you using the air conditioner on the car? If so, it's the condensation from the AC.
If you follow the path, you will find drain tubes.
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Old Jun 11, 2015 | 04:26 PM
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2002 Mercedes C320 Wagon
Originally Posted by pcy
Are you using the air conditioner on the car? If so, it's the condensation from the AC.
If you follow the path, you will find drain tubes.
Its not from the ac. I rarely use it. I said in the post im not leaking a ton of water. With that being said there is water missing from the reservoir.
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Old Jun 12, 2015 | 10:08 AM
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pcy
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
Originally Posted by krispycam
Its not from the ac. I rarely use it. I said in the post im not leaking a ton of water. With that being said there is water missing from the reservoir.

Which reservoir?
Windshield washer tank?
coolant tank?
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Old Aug 16, 2019 | 10:37 AM
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2000 w203 270 cdi
Originally Posted by krispycam
Its not from the ac. I rarely use it. I said in the post im not leaking a ton of water. With that being said there is water missing from the reservoir.
Did you find the problem? Water engine reservoir have to be added at a rate of 1 to 2 liters every 400 km driven. I see water dripping from chassis "vent" beneath the car left and right side of channel in firewall region.
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