Heater unit assembly components including circulation pump, hoses, clamps, and coolant passages on 453 Smart Fortwo.

Multiple views of heater unit with numbered callouts showing hoses, pumps, and bracket locations.

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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.