Car Coolant Radiator Expansion Kettle / Overflow Bottle Compatible with Nissan Patrol GQ (1988–1997) and Ford Maverick (1988–1994) — Part No. 17931NI020DO Key benefits Prevents overheating: Provides a place for excess coolant to expand into under temperature conditions, helping reduce engine overheating risk. Supports rapid cooling: Allows coolant to flow to and from the radiator as temperatures drop, helping the cooling system to operating pressure quickly. Stable and durable performance: Built to withstand repeated heating and cooling cycles so the cooling system remains reliable over time. Direct compatibility: Designed to fit the listed model years and mounting points for a straightforward replacement (Part No. 17931NI020DO). What it does Acts as the coolant expansion and overflow reservoir for the radiator, managing excess fluid and maintaining proper system pressure. Prevents coolant loss and air entry by capturing overflow and returning coolant to the system as it cools. Fit and application Compatible models: Nissan Patrol GQ 1988–1997; Ford Maverick 1988–1994. Replacement part number: 17931NI020DO. Intended as a direct replacement for the original expansion/overflow bottle in the specified vehicles. Typical use scenarios a cracked or discolored overflow bottle to stop coolant leaks and restore correct coolant levels. Install after radiator or hose replacement to complete the cooling system and ensure proper pressure control. Include in routine coolingsystem maintenance before long trips or offroad use to reduce the chance of overheating during heavy load or temperature conditions. Why customers choose this part Solves common cooling system problems (overheating, coolant loss, pressure imbalance) with a simple, vehiclespecific replacement. Matches vehicle compatibility and part number for reliable fitment and installation. Provides the core function needed for effective cooling system operation without extra modification. Notes for installation Verify compatibility with your vehicle year and engine setup using Part No. 17931NI020DO before . Inspect hoses and clamps during installation; any worn components to maintain a sealed system.