Clk 270cdi water from header tank going into washer bottle??

alf1956

Senior Member
Joined
Jun 30, 2011
Messages
162
Reaction score
9
Location
alf.marshall1956@gmail.com
Your Mercedes
clk270 cdi diesel
Hello fellow members'
I have a very strange thing happening to my 55 plate Clk270cdi auto, I have noticed that I am putting lots of water in the header tank on a daily basis at first I thought it may be the problem with the valeo radiator scenario but I checked the transmission fluid regular & the level has not risen so today I was topping up the header tank & the washer bottle so with the top of the washer bottle I topped up the header tank & noticed to my amazement that the water level in the washer bottle rose as I poured water in the header tank & subsequently the water level went down in accordance with the water bottle level going up! I also noticed that I have a tiny pinhole leak on a plastic elbow situated at the rear of the engine on the passenger side (I will attach a photo). This has puzzled me no end as I cannot see the connection between the header tank & washer bottle & will be grateful for any advice on this problem
 

Attachments

  • merc water leak 1.JPG
    merc water leak 1.JPG
    62.3 KB · Views: 19
  • merc water leak 2.JPG
    merc water leak 2.JPG
    62.3 KB · Views: 18

Taffy7hfa

Senior Member
Joined
May 29, 2016
Messages
1,221
Reaction score
539
Location
Oxford
Your Mercedes
2004 ML350 Inspiration .2002 ML270 CDI .2016 Hyundai i30 1.6crdi.2014 Peugeot 308 1.6 HDI.
Likely culprit is the coolant header tank, they are prone to leaking.
 

Doug1234

Senior Member
Joined
Jun 28, 2009
Messages
700
Reaction score
117
Location
Bedfordshire uk
Your Mercedes
1997 w210 e300td
I presume you have a heated washer tank which is fed with hot engine coolant through two pipes that go into the tank ,and there must be a leak in the pipework inside washer tank which would explain how the levels are rising.
 

mersum1es

Senior Member
Joined
Sep 25, 2010
Messages
2,049
Reaction score
267
Location
Finland
Your Mercedes
W212/-09/350CDI, W219/-07/320CDI, EX:W220/-01/320CDI, EX:W211/-04/320CDI, EX:W210/-01/270CDI
+1 for heated washer tank. I remember couple of cases with W210 where washer heating pipes has been leaking...
 
OP
A

alf1956

Senior Member
Joined
Jun 30, 2011
Messages
162
Reaction score
9
Location
alf.marshall1956@gmail.com
Your Mercedes
clk270 cdi diesel
  • Thread Starter
  • Thread starter
  • #7
There is no connection between either...a complete red herring somewhere!!
Been on another Merc forum & apparently there is a link between the 2 Steve, my car has a heated washer bottle which has an element in it which is connected to the cooling system & the "O" rings fail so you get coolant from the header tank passing into the washer bottle or vice versa, I have seen this with my own eyes when I was poring water into the header tank & it ma
 

Steve@Avantgarde

Forum Supporter
Authorised Forum Supporter
Joined
Dec 8, 2009
Messages
7,021
Reaction score
1,294
Location
Bristol/Somerset
Website
www.avantgarde-automotive.co.uk
Your Mercedes
C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
Been on another Merc forum & apparently there is a link between the 2 Steve, my car has a heated washer bottle which has an element in it which is connected to the cooling system & the "O" rings fail so you get coolant from the header tank passing into the washer bottle or vice versa, I have seen this with my own eyes when I was poring water into the header tank & it ma

An important piece of information left out!! If it has heated washer bottle then yes there would be an element there, I just didn't associate that with a CLK a rare piece of spec indeed, not often you see that. Usually see it on E classes etc.

Everyday is a school day!
 


With Turo, you can book and drive any Mercedes you want, wherever you want it, from local hosts across the UK, US, Canada, and Germany. Test drive cars you otherwise might never get a chance to try, or hire something interesting for your next holiday:
www.turo.com
Top Bottom