SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: Upper hose problem

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Old 05-18-2023, 01:18 PM
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2014 SL550
Angry Upper hose problem

I had Service B executed by the MB dealer about 10 days ago. I parked the car at the airport for 4 days, took a leisurely highway drive home and when I turned the car off, this happened in my garage, Not happy! Does the dealer have any responsibility here?

Also, in looking into coolant, the correct coolant should be violet colored for 2014 and up, my car has blue in it. I should not mix violet and blue and just use blue? I've clamped it back up with an Adams clamp, so I know it's now secure.

Insight into dealer responsibility and correct coolant are appreciated.





Old 05-19-2023, 04:41 AM
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Why would they mess with that hose?
Did they install new? or need to remove it to do some repair?

right now it just appears a coincidence that it fails after you get it back
if they did not touch this hose or clamp then I think - ***** happens?
Old 05-19-2023, 05:55 PM
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That's what it looks like...I put a new clamp on, refilled it and it's good to go. I'm a little concerned about the opposite hose, it looks like it has moved away from being fully seated, but I couldn't move it either way. I may put another clamp on it for insurance. Thanks for the feedback.
Old 05-19-2023, 09:41 PM
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similar happened to me. common issue .
replaced both hoses and moved on.
Old 05-30-2023, 01:42 PM
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Really??? That's somewhat comforting. It popped off again on Friday. I've taken it to a garage for assessment. I theorize that when it was serviced, there was too much coolant added and there was no place for it to expand, so the weakest point failed. Likely I overfilled it again. I am unclear how full the reservoir should be.

Hopefully, the upper hose assembly will be replaced and that should be the end of it.

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