C55 coolant leak... help
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 49
Likes: 0
From: ChiTown
C55 Amg
C55 coolant leak... help
Hey guys, hope someone here can help me. So today I noticed a coolant leak its leaking by the drain plug but I don't thing its the drain plug as I see some coolant leaking down the radiator but can't see where from. No my question is does the trans get affected by the leak? Iv noticed that it seems like it slips or has loss of power. I have no codes POP up or overheating. The trans slipping is very strange to me, are they connected somehow??
Junior Member
Joined: Jul 2012
Posts: 15
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From: SoCal
2005 C-55 AMG
Wow, my c-55 also just started leaking antifreeze from the radiator on the left side, the whole underneath of engine compartment = mess and the smell of evaporating antifreeze is horrible. just hit 100k miles recently and im going to have a local shop see what they can do by taking it out to see the problem closer. hopefully no need to replace!!! idk yet (transmission not slipping for me, exept once when i drove it manual for a littlebit. maybe it was a bad shift)
Last edited by phn1990; Sep 20, 2012 at 04:10 PM. Reason: info
Newbie
Joined: Aug 2011
Posts: 14
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From: Pittsburgh, PA
2008 Mercedes-Benz C-Class
trust me when i tell you, don't be too proud. if you C55 has a hose with a hole in it, you are not too good to seal a hose with duct tape until you can have it replaced. i don't care how rich you are, replacing a cracked block from an over heated radiator sucks all the same
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From: Western Canada
2013 C63 AMG P31, 2014 GMC Sierra (6.2)
Super Member
Joined: Dec 2007
Posts: 849
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From: ATL
2017 GLS 550
think I have a slight leak on the drivers side. question I have is when I replace the rad, how do I refill the trans to the correct level? I know I will loose whatever fluid is in the the transcooler.
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Thread Starter
Junior Member
Joined: Nov 2008
Posts: 49
Likes: 0
From: ChiTown
C55 Amg
I believe u need a dip stick. I had mine replaced by a MB mechanic as a side job and he just used the one from his work.
Senior Member
Joined: Feb 2011
Posts: 320
Likes: 40
From: Northern VA
2015 CLS63 S AMG
I have experienced what I feel is a subtle transmission slip or hesitation when cold especially, and even when the engine is fully warm at WOT. It seems that my 55 doesn't want to shift from 1st to 2nd and just lazily engages 2nd with about half the power it had, and then picks up again.
Backstory though, I did have my radiator replaced by the dealership last week at a pretty low cost with warranty. I live in Northern VA and we went from about 20 degrees outside to 70 the next day. It was a pretty drastic change so I figure it could have wreaked havoc on my cooling system.
So do I need to fill/top off my transmission fluid or my coolant because of the radiator change?
Backstory though, I did have my radiator replaced by the dealership last week at a pretty low cost with warranty. I live in Northern VA and we went from about 20 degrees outside to 70 the next day. It was a pretty drastic change so I figure it could have wreaked havoc on my cooling system.
So do I need to fill/top off my transmission fluid or my coolant because of the radiator change?
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 49
Likes: 0
From: ChiTown
C55 Amg
I have experienced what I feel is a subtle transmission slip or hesitation when cold especially, and even when the engine is fully warm at WOT. It seems that my 55 doesn't want to shift from 1st to 2nd and just lazily engages 2nd with about half the power it had, and then picks up again.
Backstory though, I did have my radiator replaced by the dealership last week at a pretty low cost with warranty. I live in Northern VA and we went from about 20 degrees outside to 70 the next day. It was a pretty drastic change so I figure it could have wreaked havoc on my cooling system.
So do I need to fill/top off my transmission fluid or my coolant because of the radiator change?
Backstory though, I did have my radiator replaced by the dealership last week at a pretty low cost with warranty. I live in Northern VA and we went from about 20 degrees outside to 70 the next day. It was a pretty drastic change so I figure it could have wreaked havoc on my cooling system.
So do I need to fill/top off my transmission fluid or my coolant because of the radiator change?
Have u done the trans reset trick? That might fix the lazy shifts.
Senior Member
Joined: Feb 2011
Posts: 320
Likes: 40
From: Northern VA
2015 CLS63 S AMG
And I have not done the trans reset, did not know about it, are you referring to the ECU reset?
Last edited by CerBErusM113; Feb 7, 2013 at 10:46 AM.
Thread Starter
Junior Member
Joined: Nov 2008
Posts: 49
Likes: 0
From: ChiTown
C55 Amg
https://mbworld.org/forums/c32-amg-c...et-smokes.html
Its a tcu reset. Try it out its easy and really works.
Its a tcu reset. Try it out its easy and really works.
