Water leak in W210 E320 CDI

[shivamramsagur]

Hello guys, my mercedes w210 E320 CDI is leaking water somewhere but i do not know where. If i am driving a distance of 10km, it consumes around 2L of water. Can anyone help? Thanks.

 

[malcolm E53 AMG]

Mine did the same I added ‘K Seal’ to the coolant and no more problems for the rest of my 15 years of ownership - great stuff no doubt saved me a fortune

Pardon our interruption...

 

[shivamramsagur]

Mine did the same I added ‘K Seal’ to the coolant and no more problems for the rest of my 15 years of ownership - great stuff no doubt saved me a fortune

Pardon our interruption...

Thank you, will try that.

 

[grahamcol]

On the other hand l tried it in a W202 C200 with a similar problem and it did nothing !

 

[joderest]

Thats quite a lot of fluid in a short distance, i would think there would be a clue somewhere. I doubt if an after market sealer would seal a leak that large.
Are you sure the pressure cap is not letting it out ?
If you cannot locate the leak i would take it to a decent independent garage for a pressure test.

 

[malcolm E53 AMG]

Thank you, will try that.

I was running the same engine as you and I couldn’t find the leak either I can only think it an o ring or gasket somewhere that wasn’t sealing when the engine was running - worth a try K Seal sorted the problem totally much to my relief I‘d got to the stage where I thought it would be a cylinder head off or serious strip down job

 

[LostKiwi]

No no no no.... K Seal and the like can completely screw the heater matrix by blocking the cores.
I had the same issue on a Saab, K-Sealed it and the heater never worked again.

Check the top hose when hot. Is it rock hard? If so you've blown a head gasket.

 

[mioba]

personally these snake type oils dont fix anything, but mask the issue, plus you will be replacing mote when that rubbish blocks the sytem.
2 litres is significant.
Have you a drive way. do you know your way arounds cars. get the car warmed up on the driveway and inspect every bit
of the coolant circuit as possible.

if no leak external. is there pressure building up in system -
cracked head or gasket - will need a sniffer test.

 

[joderest]

The only time i have known a sealer to work is on my daughters Mini Cooper, had a slight leak from radiator, did not want to strip car down in winter, so i bought some Barrs leak, the old school stuff that is a pellet you crumble into the header tank.
The leak was tiny, about a litre of fluid in about 800 miles.
It has worked with no problems, but i will replace the rad in the summer.

 

[shivamramsagur]

I guess it's the gasket, because i can find sign of water from exhaust pipe.

 

[Naraic]

I guess it's the gasket, because i can find sign of water from exhaust pipe.

There is always water at the end of an exhaust pipe. Remove the oil filler cap...what do you see?

 

[shivamramsagur]

There is always water at the end of an exhaust pipe. Remove the oil filler cap...what do you see?

It looks normal

 

[joderest]

The only way for this poster is to have a pressure test and sniff test done
Pressure will find any water leaks
Sniff test will see if any combustion gasses in water.
If it were a head gasket, loosing that much water in a few miles it would be pouring out of the exhaust, is the oil normal or milky ?
This time of year all cars will produce steam or dripping water from the exhaust.

 

[LostKiwi]

Engine off and cold squeeze the top radiator hose.
Turn on engine and allow to warn up slightly (idling). Squeeze top hose again. If it's rock hard the headgasket is toast as it's allowing pressure from the cylinders into the coolant. You may not get water in the oil as pressure differential the other way is significantly lower.

Another test is to start the engine from cold with the coolant cap removed and the level set to the top. A smooth loss of water from the reservoir is fine. Big bubbles are a sign of head gasket.

If that all checks out ok get a UV dye kit from a well know auction site. Pour it in the system, run the engine untill it's lost coolant and check for the leak by shining the UV torch about the engine bay. With that level of loss it will be obvious.