Remove/install heater housing procedure 454.0 with engines 134.9, 135.9, 639.9 showing numbered callout locations and component breakdown.

Engine bay photograph with numbered callouts showing heater housing removal location and components on Smart 454 model.

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See all HVAC & Comfort 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.