Check coolant level often
Thread Starter
Senior Member
Joined: Dec 2005
Posts: 258
Likes: 1
From: redondo beach, ca
2005 C230 SS
Check coolant level often
Hello, 205 W203 with a126k miles. recently when i drive it for a few days straight i get the 'check coolant' level warning on the dash. i checked under the car and in the engine bay and i dont see any leaks. i fill up with benz approved coolant and keep driving. but its happening almost weekly when i drive it for a few days in a roll. now i didnt noticed this too much since i wasnt driving my car very much because of the pandemic, its mostly in the garage. and if i did drive it it was short 10 min drives to the store. just wondering what could be causing this as i dont see any physical leaks. i searched the forum but found mostly about physical leaks. any help is appreciated!
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
Are you sure you do not have a physical leak at the back of the engine?
Leaks often dry up before they drip onto the trays. Checking underneath is not a good indicator. Check the actual engine as there are several plastic pipes known to go bad. See thread above.
Leaks often dry up before they drip onto the trays. Checking underneath is not a good indicator. Check the actual engine as there are several plastic pipes known to go bad. See thread above.
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
Likes: 236
From: BC, Canada
2003 C230K Coupe Orion Blue
Glad you found the problem. 
There are 3 pipes and 1 nipple that are known for cracking and leaking, as mentioned in that thread above. I highly recommend changing out all 4. The old parts all made of the same inferior grade of plastic so another leak will be imminent. All of mine failed within a few months of each other.
MB changed the grade of plastic used for some of the pipes. Your dealer will have this information. For this reason I recommend only buying OEM (Geniune MB, from a dealer or a reputable distributor) pipes, as this is the only way to guarantee you're getting the ones made from the updated plastic.
There are 3 pipes and 1 nipple that are known for cracking and leaking, as mentioned in that thread above. I highly recommend changing out all 4. The old parts all made of the same inferior grade of plastic so another leak will be imminent. All of mine failed within a few months of each other.
MB changed the grade of plastic used for some of the pipes. Your dealer will have this information. For this reason I recommend only buying OEM (Geniune MB, from a dealer or a reputable distributor) pipes, as this is the only way to guarantee you're getting the ones made from the updated plastic.
Last edited by slammer111; Mar 5, 2021 at 03:44 PM.
