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2003 C200K Losing Water

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Old Nov 14, 2012 | 04:30 AM
  #1  
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C200k model 2003
2003 C200K Losing Water

Hi
I have a 2003 model C200K that is loosing cooling water at a rate of about 2 litres per 300 km. There are no visible leaks and no water in the oil, the car does not overheat or under perform. I have replaced the head gasket, oil cooler and water pump but this has not fixed the problem! Does anyone have any advise or had similar issue?
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Old Nov 14, 2012 | 05:47 PM
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
Originally Posted by JimLou1960
Hi
I have a 2003 model C200K that is loosing cooling water at a rate of about 2 litres per 300 km. There are no visible leaks and no water in the oil, the car does not overheat or under perform. I have replaced the head gasket, oil cooler and water pump but this has not fixed the problem! Does anyone have any advise or had similar issue?
After 45 people have viewed this with no input I thought I would commiserate with you. It certainly is a problem & you seem to have covered all the logical aspects.

There must be an answer but as the car is running well all you can do is wait for something to develop & keep a close eve on the coolant level. At that consumpion rate it will become expensive to keep adding inhibitor but it will be worthwhile doing so.

I wonder whether it would be useful to change your thermostat . How is the coolant temp? .What do the mechanics say who did the head ?. Is there any sign of bubbles from the coolant reservoir?

All I can think of is that you may have a slight leak in the head itself which is allowing a small amout of coolant into the combustion chamber , not enough to be visable in the exhaust.

Have someone view the exhaust at first start of the day for any water emission.

Sometimes with this type of leak a small amount of coolant accumulates on top of the piston when the engine is sitting. This can cause a miss when first starting. If you can see the pistons with the spark plugs removed it may be worth a look with a scope.

Good luck & keep is posted .

Carsy John
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Old Nov 15, 2012 | 12:09 AM
  #3  
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From: Toronto, Ontario, Canada, eh!
2003 C230 Sports Coupe, Paprika Metallic Red, Auto, Pano, Leather
Check the black hose connector behind the engine in front of the firewall,... see if there are any white powder around there,... if so, that clamp needs to be tighten.
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Old Nov 18, 2012 | 01:26 AM
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2007 W204 220CDI Classic Sedan
Jim, Have you found where the coolant is disappearing ?
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Old Nov 18, 2012 | 02:08 AM
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From: chicago
2005 c230 kompressor 2003 s500 94 wrangler
did u bleed the air out of the system after u replaced the water pump?

if their is no leak then this is only thing that is pausible
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Old Nov 18, 2012 | 11:53 PM
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C200k model 2003
Originally Posted by sammydragon3
did u bleed the air out of the system after u replaced the water pump?

if their is no leak then this is only thing that is pausible
Hi Sammy
I had this done at a workshop and trust that the mechanic would have bled the system.
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Old Nov 18, 2012 | 11:55 PM
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C200k model 2003
Originally Posted by Carsy
Jim, Have you found where the coolant is disappearing ?
Not yet John. Car is going in today to re-check the head as it is still under guarantee. Will keep you posted.
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