C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Coolant hose m271

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Old Aug 10, 2025 | 01:13 PM
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c230k/s500
Coolant hose m271

Hey guys, I have coolant leaking from this hose on the left side of my engine in a 2004 c230k m271 engine. What is this hose called or the part number for it. It holds the engine temp sensor on it as you can barely see it on the rt lower side of the picture. Thanks for any help.


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Old Aug 10, 2025 | 04:07 PM
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2005 C230 Sport Sedan-6 Speed Manual
Scroll down to post #29 in this thread. That post shows the part number and other details.

There are three plastic pipes on the M271 engine. All three of mine failed within a two-year period. You might consider changing all three at the same time while you have the cooling system drained. You can find comprehensive information in this thread.

Good luck repairing your car.

Last edited by KevinH2000; Aug 10, 2025 at 04:08 PM.
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Old Aug 11, 2025 | 01:19 AM
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c230k/s500
Thank you sir.
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