A-Premium Engine Coolant Overflow Recovery Reservoir with Sensor & 30 PSI Cap — Fit for BMW E46/E83/E53 2.2–3.0L

A-Premium’s pressurized engine coolant overflow recovery reservoir with sensor and spring‑loaded cap is a direct-fit replacement for select BMW E46, X3 and X5 models, restoring proper coolant recovery and system pressure control.

This replacement coolant tank is molded from heat‑resistant PA plastic, includes the electronic level sensor, and arrives with the matching 30 PSI spring‑loaded cap and clamp so you can swap the old, cracked reservoir for a complete unit. Designed to match OE mounting points and hose connections, it fits a range of 2.2L–3.0L BMW gasoline engines across the E46, E83 and E53 platforms, offering a reliable and straightforward way to maintain cooling system performance.

Will this reservoir fit my BMW model?

Yes — the A-Premium tank is built to fit many common BMW models that used the E46, E83, and E53 chassis with 2.2L–3.0L engines. Confirm fit by cross‑checking your vehicle year and engine displacement with the compatibility list and reference numbers before ordering.

• Compatible models include E46 320i/323/325/328/330 model years listed in the fitment details.
• Fits X3 (E83) 2004–2010 and X5 (E53) 2001–2006 with 2.5L/3.0L engines.
• Reference numbers: 17137787039, 17111436413, 17117573781, 17132247553 and related part codes.

What are the key specifications and what comes in the box?

The tank is a pressurized unit made from durable polyamide (PA) plastic and sized to OEM mounting. It includes the level sensor, a 30 PSI spring‑loaded twist cap, and a clamp for immediate installation.

• Pressurized design with maximum cap rating: 30 PSI.
• Materials: heat- and vibration‑resistant PA plastic; mounting hole count: 1.
• Package includes: 1 reservoir, 1 cap, 1 sensor, and 1 clamp; dimensions: H 359.7 mm × L 121.3 mm × W 133.4 mm.

How does replacing the reservoir affect cooling system performance?

Installing a new overflow tank with a working cap and sensor restores proper coolant recovery, prevents air ingress, and helps the system hold designed pressure. That stability supports more consistent engine temperatures and reliable coolant level monitoring.

• Prevents coolant loss through cracks or degraded seams common in aging tanks.
• Maintains correct pressure with the included 30 PSI cap for efficient heat exchange.
• Restores electronic level detection for accurate dashboard warnings.

Is this an OEM part and what warranty/support is offered?

While this A-Premium unit is an aftermarket replacement, it’s manufactured to match original mounting, connections, and function. A-Premium backs the reservoir with a 1‑year unlimited‑mileage quality guarantee and customer support for fitment or installation questions.

• Not an original BMW part but designed for direct replacement and compatibility.
• Includes warranty: 1 year, unlimited mileage; customer service available for assistance.
• Useful reference codes and cross‑numbers included to verify compatibility with your OEM part.

Who is this for: This A-Premium coolant overflow recovery tank is for BMW owners, mechanics, and DIY enthusiasts who need a full replacement reservoir assembly for E46, X3 (E83) or X5 (E53) vehicles with 2.2L–3.0L engines. It's aimed at anyone seeing cracks, coolant loss, incorrect level readings, or a failed cap — offering an affordable, ready‑to‑install solution that restores coolant containment, sensor function, and system pressure.