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Mercedes W220 S350 S500 Coolant Loss — Plastic Thermostat Housing — Mercedes-Benz S-Class 2000 | MyCarFault
⚪ UNSOLVED No confirmed fix yet · Be the first to help

Mercedes W220 S350 S500 Coolant Loss — Plastic Thermostat Housing

Mercedes-Benz S-Class 2000 M112/M113
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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

The plastic thermostat housing on M112/M113 V6/V8 engines cracks with age, causing coolant loss. The crack is often at the housing base where it contacts the block. Sweet smell and low coolant level are early signs. Replace thermostat housing, thermostat and adjacent coolant hoses simultaneously. Cost: £200-400.

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 2000 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

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