Coolant system drain and fill locations, engine 281 in smart fortwo chassis 453, expansion reservoir and hoses shown.

Engine bay diagram showing coolant expansion reservoir, caps, breather hose, and coolant lines with numbered callouts.

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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.