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Just wanted to add my experience for posterity of the forum. My '03 c230 has 110k miles on her and I just had to replace this pipe - the one above the exhaust manifold. I replaced the coolant pipe and vacuum pump at the rear of the engine last summer due to leaks, but had to add water several time over the past year and located a (hopefully 'the') leak where this pipe enters the head. The pipe had cracked at the groove for the o-ring. Had to pull the cracked off part of the pipe out of the head. I would definitely pull the heat shield to remove the pipe. I also used a piece of bailing wire to keep the hose clamp from slipping down the hose which runs behind the engine. I also used a very, very small amount of waterproof grease to lube the o-ring to make it easier to get in place. It took about 2 hours including putting the car up on ramps, removing bottom pan to drain coolant (reused coolant, still fresh from last summer), and letting cool down enough to do the work. Hoping this was the last of the coolant leaks. If I could find a suitable adapter I would pressure test - or a suitable vacuum system which would work on this car I might consider getting on of those.
Hello guys..
Doing a mini invasion on that topic so i share my issue here hence is the most relevant i found.
I have a w204 C200 Kompressor (204.041) (135 KW / 184 PS)
I had the top up coolant index yesterday,did a ~150kms route.
Later in the night as i was reurning home, I saw some "smoke".
Turns out it was the antifreeze fluid evaporating as it was leaking on hot surface of the engine.
Tank was 1/3 full at this time.
I was "hoping" it was a hose or an o-ring but i might be in deeper trouble.
Can you tell me by your experience if that is a crack on the engine block?
Or this "line" is the way the aluminum is casted and the leakage comes from above,where the hose contacts? video:
Hello guys..
Doing a mini invasion on that topic so i share my issue here hence is the most relevant i found.
I have a w204 C200 Kompressor (204.041) (135 KW / 184 PS)
I had the top up coolant index yesterday,did a ~150kms route.
Later in the night as i was reurning home, I saw some "smoke".
Turns out it was the antifreeze fluid evaporating as it was leaking on hot surface of the engine.
Tank was 1/3 full at this time.
I was "hoping" it was a hose or an o-ring but i might be in deeper trouble.
Can you tell me by your experience if that is a crack on the engine block?
Or this "line" is the way the aluminum is casted and the leakage comes from above,where the hose contacts? video: leakage point
Here's the photo of mine ... unfortunately I didn't take a very clear photo so it's hard to tell ... but it does look like a casting flange in there. If you are the original owner of this car and never had an overheating problem, then I would assume no reason to think you've cracked the head. It's not a huge amount of work to replace that o-ring ... 2005 M271
I was "hoping" it was a hose or an o-ring but i might be in deeper trouble.
Can you tell me by your experience if that is a crack on the engine block?
Or this "line" is the way the aluminum is casted and the leakage comes from above,where the hose contacts?
Hi Justap,
Are you sure it is leaking from that area? If you are sure, then most likely it is the old o-ring, not the block. That line is just from casting.
One way to make sure is to start the car, get the cooling system up to pressure, then stop the car and observe; as the engine cools down, you should start seeing something.
I notice some stains on the front and also on the power steering reservoir. Check it it is not from the water pump - there is a little weep hope, IIRC toward the top of the pump casing by the pulley.
Last edited by VVF; 02-03-2019 at 07:17 PM.
Reason: typo
Hi guys!
So let's say I got lucky in my unlucky situation.
Only the horizontal tube needed replacement.
Flush of the system, new fluids, all done to the steelership because i wanted to be sure and have the guarantee hence its a weak point of our engines.
Thank you all for the answers and interest you shown, I appreciate it!
Last edited by justapstar7; 02-04-2019 at 01:08 PM.
That looks like the transmission cooler line. There is a small o-ring in there that probably needs to be replaced. It was part #C-019-997-57-45 when I bought it 10 years ago to do the tranny fluid flush ... retailed for $5 each and they gave it to me for about half that. Look like FCP Euro, for one, still carries it ... https://www.fcpeuro.com/products/mer...ing-0199975745
To remove the fitting, first there are a couple of clamps on the line that are holding it against the radiator, you will have to unfasten them ... then simply slide that clip out of the fitting about a half inch and then pull the fitting straight out away from the radiator ... it's a round tube with an o-ring on it ... you might need to wiggle it a bit as the o-ring makes it a tight fit.
You are at the top of the circuit so little if any tranny fluid will leak out ... but put a few paper towels under there to catch any drips.
07-29-2018, 03:26 PM
Look under your own bonnet - I did and easily found it! It's obviously the water pipe
