BMW E90 328i Coolant Reservoir: Performance & Maintenance Guide

The BMW E90 328i’s coolant reservoir is a vital component in maintaining engine temperature and preventing overheating, ensuring reliable performance across all driving conditions.

Understanding the BMW E90 328i Coolant Reservoir

Located near the radiator, the coolant reservoir in the E90 328i acts as a temporary storage for engine coolant, absorbing expansion during heating and supplying fluid during cold starts. Made from durable plastic, it features a transparent design to monitor coolant levels easily, reducing the risk of overheating due to low fluid."This reservoir plays a key role in the vehicle’s thermal management system, helping maintain optimal operating temperature.

Common Issues and Symptoms

Over time, the coolant reservoir in the E90 328i may develop cracks, leaks, or internal corrosion, often signaled by visible coolant seepage, low reservoir levels, or warning lights. Contaminated coolant or air pockets can reduce system efficiency, leading to engine overheating. Regular inspection helps prevent costly damage and ensures smooth operation.

Maintenance and Replacement Tips

To maintain the E90 328i coolant reservoir, perform routine checks every 6 months, inspecting for cracks, leaks, and proper seal integrity. Replace the reservoir every 5–7 years or when signs of wear appear. Always use manufacturer-recommended coolant and flush the system periodically to prevent contamination. When replacing, follow proper drainage and sealing procedures to avoid future issues.

Proper care of the BMW E90 328i coolant reservoir is essential for engine longevity and performance. Stay proactive with inspections and timely replacements to keep your classic BMW running smoothly. For expert guidance, visit your nearest BMW specialist or consult a certified mechanic.

In this video I will replace coolant reservoir on a 328i E90 with the N51 SULEV engine. This will be the same procedure for the E91, E92 and E93. Even if its has the N52K engine.

Order Genuine BMW 328i Coolant Reservoirs online with affordable price today! BMW Parts Deal's large inventory of Coolant Reservoirs fit 1996. Dtomi Engine Coolant Reservoir Radiator Expansion Tank With Cap Compatible With BMW Vehicle E90 E91 E92 E93 328i 330i 335i X1 Z4 2007-2016 #Replace 17137607482, 17137640514, 17137567462 100+ bought in past month Add to cart. BMW E90 328i N52 3.0L Engine Cooling Parts 1 2 3 4 5 6 7 8 9 20 Bleeder Screw Coolant Coolant Flanges Drain Plug Expansion Tank Fan Freeze Plug Heater Core Hoses Lines Oil Cooler Performance Radiator Refresh Kit Temperature Sensor Thermostat Tools Water Pump Sort By Return to Top.

2009-2011 BMW E90 328I RWD COOLANT RESERVOIR TANK OEM LOT618. Make & Model: RWD BMW 3281. Year: 2011.

No labor warranty is provided. On certain models, namely E36, E46, and E90, the factory BMW expansion tank is prone to either breaking at connection points or blowing apart altogether. If you're starting to feel like your expansion tank is on borrowed time, it's probably time to replace with either a direct OE replacement, or strengthen your cooling setup with an aluminum expansion tank.

When a coolant expansion tank ages it becomes brittle and develops hairline cracks. You may have a coolant leak on the left side of the radiator or a catastrophic failure with a major coolant leak. Inspect your expansion tank every time you change your oil.

Look for cracks or any signs of leaks. Ignoring a small crack is a bad idea as they can grow rapidly and create a major coolant leak. BMW 328i E90 How to replace Coolant reservoir N51/N52K E91 E92 E93 2006.

Buy 603-334 Coolant Reservoir Tank with Cap for BMW E90 E91 E92 E93 E82 E88 E84 E89 135i 328i 330i 335i X1 Z4 2006-2016, Replace# 17137607482 17137640514 17137567462, Aluminium Alloy: Coolant Recovery Kits. FEATURE Condition: Brand New Types: Coolant Expansion Tank Direct Replacement, Easy Installation High Customer Service Satisfaction After Service Follow Up Material: Plastic Color: Black Cap Include: Yes Sensor Include: Yes Package Contents: 1 x Coolant Reservoir REFERENCE PART NUMBER 17137567462, 17137607482, 17137640514, 17137519368, 603-334, BM3014110.

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