Front Coolant Reservoir Fits BMW 535 640 740 ActiveHybrid
Regular price
$131.52
Front Engine Coolant Expansion Tank
High-Pressure Thermal Management for BMW 5, 6, and 7 Series
Maintain the integrity of your BMW’s cooling system with this Premium Front Coolant Expansion Tank. Designed for the high-pressure demands of turbocharged and hybrid powertrains, this reservoir manages coolant expansion and air separation. Over time, the constant thermal cycling of the engine bay causes factory plastic tanks to develop hairline cracks or seam failures. This replacement unit is engineered to withstand these stresses, preventing sudden coolant loss and protecting your engine from catastrophic overheating.
This assembly is a comprehensive solution, arriving fully pressurized and equipped with a new spring-loaded twist cap and an integrated level sensor. Manufactured from high-grade, heat-resistant plastic, it serves as a direct-fit replacement for the front cooling circuit, ensuring your vehicle stays within its optimal operating temperature range.
Fitment Verification and Vehicle Applications
This expansion tank is designed for the Front position on the following models:
BMW 5 Series (535i, 535d, GT, xDrive): 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017.
BMW 6 Series (640i, Gran Coupe, xDrive, Gran Turismo): 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019.
BMW 7 Series (740i, 740Li, 740Ld, xDrive): 2011, 2012, 2013, 2014, 2015.
BMW ActiveHybrid 5: 2012, 2013, 2014, 2015, 2016.
BMW ActiveHybrid 7: 2013, 2014, 2015.
Fitment Note: This is the primary Front reservoir. Some models, particularly Hybrids, may utilize secondary tanks for intercooler or battery cooling circuits. Please verify your original part number or tank shape before installation.
Technical Specifications and Attributes
Position: Front.
Material: High-Strength Reinforced Plastic.
Cap Included: Yes (Spring Loaded Twist Type).
Maximum Pressure Rating: 20 PSI.
Level Sensor Included: Yes.
Pressurized: Yes.
Dimensions: 11.5 inches (Height) x 7.5 inches (Length).
Mounting: 6 Mounting Hole Configuration (Hardware not included).
Color/Shape: Black / Irregular.
What’s in the Box
(1) Pressurized Coolant Expansion Tank
(1) High-Pressure Radiator Cap
(1) Integrated Coolant Level Sensor
Industry Cross-Reference Numbers
BMW: 17137647283, 17117639020, 17137553919, 17137601949
Dorman - OE Solutions: 603-830
Rein: EPT0151, EPP0151
URO Parts: URO011124
Installation and Technical Tips
Safety First: Always wait for the engine to cool completely before opening the cooling system. Pressurized coolant can reach temperatures well over 200°F and cause severe burns if the cap is removed prematurely.
System Bleeding: BMW vehicles with electric water pumps require a specific "Bleed Procedure" to remove air pockets from the system. This typically involves a sequence of holding the accelerator pedal with the ignition on (engine off) for 10-12 minutes. Failure to bleed the system can lead to localized hot spots and engine damage.
Hose Connection: Inspect the O-rings inside your coolant hoses before attaching them to the new tank. If the O-rings are flattened or brittle, replace them or the hose assembly to ensure a leak-free "quick-connect" seal.
Fluid Specification: Use only BMW-approved phosphate-free coolant mixed 50/50 with distilled water. Using tap water or incorrect coolant types can cause mineral buildup and corrosion within the delicate aluminum cooling passages of your engine.
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item, only in the case of:
– Received the wrong item.
– Item arrived not as expected (ie. damaged packaging).
– Item had defects.
– Over delivery time.
– The shipper does not allow the goods to be inspected before payment.
The returned product(s) must be in the original packaging, safety wrapped, undamaged and unworn. This means that the item(s) must be safely packed in a carton box for protection during transport, possibly the same carton used to ship to you as a customer.
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