Mercedes W220 S350 S500 Coolant Loss — Plastic Thermostat Housing
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.
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