Go Back   MBClub UK - Bringing together Mercedes Enthusiasts > Technical > Engine
MBClub supports BEN Official Stickers @mbclubuk


Engine Engine/transmission and other oily matters

Like Tree1Likes
  • 1 Post By dozypillock
Reply
 
Thread Tools
Old 25-12-2016, 01:13 AM   #1
Hardcore MB Enthusiast
 
clk320x's Avatar
 
Join Date: Sep 2016
Location: London / Northamptonshire
Car: CLK320 W209, AMG styling, Facelifted Dash, 18" AMG style wheels, Pioneer SPH-DA120 App Radio
Posts: 428
Clk coolant leak

Had coolant check light flash up, checked coolant and was just under half of tank. When engine warmed up and switched off and on the lift disappears.

Anyway when cold I poured in some 100% Antifreeze (from MB) and then the light disappeared.
What's worrying is this is the second time I've had to do this so there definitely is a leak.althought it's taken over a month atleast
Havnt been able to get to garage due to family reasons etc etc, anyone have any idea what it could be?
Checked oil and is crystal clear so hoping that rules out head gasket
Love the car so hoping it's something minor.
Anyone have any experience with similar issue? I'm sure I'm running over a 50:50 mix at the moment, can this harm the engine?
Cheers
clk320x is offline   Reply With Quote
Old 25-12-2016, 08:33 AM   #2
Hardcore MB Enthusiast
 
Join Date: Mar 2016
Location: Northwest UK
Car: A Class A250 w176
Posts: 685
I had a crack in the thermostat housing that only leaked coolant when it warmed up and the crack opened up from expansion, took an age to find the source of the leak, went though 10ltrs of G48 topping it up, when the source was eventually found it was replaced under warranty thank goodness.
Cheers
Ben
A250 Bennyboy is offline   Reply With Quote
Sponsored Links
Old 25-12-2016, 11:23 AM   #3
Hardcore MB Enthusiast
 
Join Date: Jul 2014
Location: West Sussex
Car: C209 CLK320
Posts: 466
What year is this? ie 2002/3 vintage?
Mine had the classic "valeo" problem and the water can get into the gearbox oil through the Radiator.
May be worth checking before too many miles, or the gearbox gets damaged.

Neil
rorf likes this.
dozypillock is offline   Reply With Quote
Old 25-12-2016, 11:32 AM   #4
Hardcore MB Enthusiast
 
PobodY's Avatar
 
Join Date: Aug 2016
Location: Stoke-on-Trent
Car: CLK350, Nissan GTiR
Posts: 798
It's probably just a pin-hole in one of the hoses; it doesn't leak until the system is at full pressure. If it sprays on to the exhaust you'll never see anything because it immediately evaporates.
PobodY is offline   Reply With Quote
Old 25-12-2016, 02:10 PM   #5
Hardcore MB Enthusiast
Threadstarter
 
clk320x's Avatar
 
Join Date: Sep 2016
Location: London / Northamptonshire
Car: CLK320 W209, AMG styling, Facelifted Dash, 18" AMG style wheels, Pioneer SPH-DA120 App Radio
Posts: 428
Dozy it's a 2003
W209 how would I check if it had a valeo radiator? Cheers
clk320x is offline   Reply With Quote
Old 25-12-2016, 02:48 PM   #6
Hardcore MB Enthusiast
Threadstarter
 
clk320x's Avatar
 
Join Date: Sep 2016
Location: London / Northamptonshire
Car: CLK320 W209, AMG styling, Facelifted Dash, 18" AMG style wheels, Pioneer SPH-DA120 App Radio
Posts: 428
Quote:
Originally Posted by dozypillock View Post
What year is this? ie 2002/3 vintage?
Mine had the classic "valeo" problem and the water can get into the gearbox oil through the Radiator.
May be worth checking before too many miles, or the gearbox gets damaged.

Neil
How can I check if mine has a valeo? It's a 03
clk320x is offline   Reply With Quote
Old 25-12-2016, 03:18 PM   #7
Hardcore MB Enthusiast
 
Join Date: Feb 2008
Posts: 337
You can buy a pressure tester and test it. Once you apply pressure the leak will either show itself or not. If if it does not, likely to be an internal leak like a head gasket.
alabbasi is offline   Reply With Quote
Old 25-12-2016, 03:20 PM   #8
Administrator
 
KillerHERTZ's Avatar
 
Join Date: May 2003
Location: Cambridge
Car: CLS55 AMG
Posts: 14,860
Highly unlikely to be the Valeo issue after 13 years of use. Would have given up the ghost long ago.
KillerHERTZ is offline   Reply With Quote
The Following User Says Thank You to KillerHERTZ For This Useful Post:
clk320x (25-12-2016)
Old 27-12-2016, 12:03 PM   #9
Hardcore MB Enthusiast
 
Join Date: Oct 2011
Location: Birmingham
Car: 2x c43 Amg clio 172 turbo 314bhp
Posts: 1,459
Quote:
Originally Posted by KillerHERTZ View Post
Highly unlikely to be the Valeo issue after 13 years of use. Would have given up the ghost long ago.
I am still doing these, w220/w211 mostly.

To cross that off you list of possibilities you would need to get a glycol test on the transmission oil.

Waters pumps are another contender, you will see crystallised coolant at 6 o'clock below the pulley.
Auto-mobile is offline   Reply With Quote
The Following User Says Thank You to Auto-mobile For This Useful Post:
KillerHERTZ (27-12-2016)
Reply

Tags
clk, coolant, leak


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools



All times are GMT +1. The time now is 11:04 PM.


MB club UK is A Mercedes Enthusiast club run by enthusiasts for enthusiasts, MBClub UK is in no way affiliated with Mercedes-Benz, DaimlerChrysler or any of their respective trademarks. The posted views of our members are in no way the views of MBClub.co.uk or its owners.
Find us on Google+