Coolant Expansion Tank Bleeder Screw — Brass Compatible for BMW E36, E39, E46, E53 and Bill Car oil / radiator pipe / water tank pipe What it does Allows controlled bleeding of air from the coolant expansion tank and pipe so the cooling system fills correctly. Helps the cooling system reach and maintain flow, reducing temperature spikes and improving cooldown speed. Offers a reliable threaded bleed point for routine maintenance and repairs. Key benefits Solves temperature problems: vents trapped air that can cause hot spots and overheating. Rapid cooling support: helps the system establish steady coolant circulation faster after service or refill. Stable and durable: solid brass construction resists corrosion and withstands operating temperatures and pressure cycles. Important attributes Function: coolant expansion tank bleeder screw for releasing air and aiding coolant flow. Compatibility: listed for BMW E36, E39, E46, E53 and Bill Car oil/radiator/water tank pipe applications. Material: brass — corrosionresistant and mechanically robust for longterm service. Performance: designed to provide a consistent bleed point to improve cooling stability and reduce recurring overheating after maintenance. Practical applications / use scenarios Service and maintenance: a stripped or leaking bleeder screw when changing coolant, thermostat, or water pump on compatible BMW models to ensure proper bleeding and fill. Overheating troubleshooting: use during diagnosis and when the engine shows inconsistent temperature behavior caused by trapped air in the cooling loop. Onroad emergency : temporarily reinstall or a faulty bleeder screw to restore proper coolant circulation and prevent overheating until full service is available. Installation notes Intended as a directfit bleeder point on the expansion tank / pipe assemblies listed above. Verify fit against your vehicle's existing screw before installation. Tighten to appropriate torque for your vehicle's plastic or metal tank to avoid overtightening; inspect seals or Orings if present. Materials and durability Brass construction provides corrosion resistance and dimensional stability under repeated thermal cycles, contributing to longer life compared with lowquality alternatives. If you need a dependable bleeder screw to restore correct coolant bleeding and cooling performance on BMW E36, E39, E46, E53 or compatible Bill Car radiator/water tank pipe systems, this brass expansion tank bleeder screw is designed for that purpose.