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Mercedes W221 S-Class Coolant Loss — Plastic Pipe Failure — Mercedes-Benz S-Class 2005 | MyCarFault
⚪ UNSOLVED No confirmed fix yet · Be the first to help

Mercedes W221 S-Class Coolant Loss — Plastic Pipe Failure

Mercedes-Benz S-Class 2005 M272/M273
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⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟡 Monitor Closely

Multiple plastic coolant pipes and T-pieces on the M272/M273 V6/V8 engines in W221 crack with age. Coolant loss is often gradual and may not be immediately visible. Sweet smell from engine bay and slight temperature gauge rise are early indicators. A full cooling system inspection and plastic component replacement every 80,000 miles is recommended.

Repair / Solution

No confirmed fixes yet. Share yours below.

⚠️ Wrong Diagnosis?

No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz S-Class 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

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