Coolant replacement procedure for 454.0 engine showing expansion reservoir, drain plug, radiator, and filling points.

Engine bay diagram with numbered callouts for coolant system components on Smart Fortwo 454.

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See all Powertrain figures for the Fortwo / Forfour (453), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.