Air conditioning system cap, refrigerant line, service unit connections and safety procedures for smart 450/451/452/454.

Four-panel diagram showing AC cap location, refrigerant lines, service unit, and engine compartment connections with numbered callouts.

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See all HVAC & Comfort figures for the Fortwo (450), 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.