BMW 525i 528i 530i 535i 545i 550i Coolant Reservoir Tank 2.5L 3.0L 4.4L 4.8L Replace 603-351 Z49011 | BDFHYK
Regular price
$45.99
Product Detail
- Type Coolant Reservoir
- SKU BDDLZ-BD-05-10539
- OE Number
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BDFHYK Engine Coolant Expansion Reservoir Overflow Tank Replacement
This BDFHYK engine coolant expansion reservoir overflow tank is designed as an OE-style replacement for selected BMW 5 Series, 6 Series, and 550i GT applications. It is built for drivers replacing an aging, stained, cracked, or leaking coolant reservoir while keeping fitment and OE-number confirmation clear before purchase.
A coolant reservoir helps provide a visible coolant level reference and supports normal coolant expansion and recovery within the vehicle cooling system. If the original reservoir is brittle, hard to read, or showing signs of coolant seepage, replacing it with the correct reservoir can help restore the cooling system layout to its intended configuration.
Vehicle Fitment Reminder
Please confirm your vehicle year, make, model, engine, and OE reference number before ordering. This coolant reservoir is designed for selected BMW applications including 2008-2010 528i / 528xi 3.0L, 2009-2010 535i xDrive 3.0L, 2006-2010 550i 4.8L, 2006-2010 650i 4.8L, 2006-2007 525i / 525xi 3.0L, 2004-2007 530i / 530xi 3.0L, 2004-2005 545i 4.4L, 2004-2005 645Ci 4.4L, and 2010 550i GT 4.4L, according to the current product data.
Fitment may vary by trim, production year, engine configuration, and cooling system layout. Always compare the old reservoir shape, mounting points, hose connections, and OE number before installation.
OE / Interchange Reference
- 603-351
- 603351
- 17137542986
- 17137519219
- 17137652986
- 376789731
- 7542986
- CRT205000S
- EPK0128
- FRT1915C
- FRT1906C
- Z49011
OE and interchange numbers are provided for fitment comparison only. Please verify that one of these numbers matches your original part or your vehicle parts catalog before ordering.
Common Replacement Signs
- Visible cracks, staining, yellowing, or brittle plastic on the original reservoir
- Coolant marks or wet areas around the tank body or hose connections
- Repeated low coolant level after topping off
- Sweet coolant smell after driving
- Coolant puddles under the vehicle after parking
- Difficulty reading the coolant level through the old reservoir
These symptoms can also be related to hoses, clamps, radiator cap, thermostat, radiator, or water pump. If coolant loss continues after replacement, inspect the full cooling system.
Product Features & Specifications
- Product Type: Engine coolant expansion reservoir / coolant overflow tank
- Brand: BDFHYK
- Material: PA66+GF30 material, based on current product specification
- Replacement Style: OE-style replacement for selected BMW applications
- Primary Function: Helps provide coolant expansion space and visible coolant level reference
- Fitment Method: Confirm by vehicle year, model, engine, old part shape, hose layout, and OE number
- SKU: BDDLZ-BD-05-10539
Before You Buy
- Confirm your BMW model, production year, trim, and engine.
- Compare your original reservoir with the product images.
- Check the hose connection locations and mounting points.
- Verify the OE or interchange number when available.
- Confirm whether your original setup requires a specific cap, sensor, or hose arrangement.
If your vehicle has previous cooling system repairs or modifications, compare the old part carefully before installation.
Installation Notes
- Install only when the engine is fully cool.
- Do not open the cooling system while it is hot or pressurized.
- Inspect hoses, clamps, and nearby cooling system connections during replacement.
- Refill coolant according to the vehicle manufacturer's recommended procedure.
- Bleed air from the cooling system if required by the BMW service procedure.
- Professional installation is recommended if you are not familiar with cooling system service.
FAQ
How do I know if this coolant reservoir fits my BMW?
Check your year, model, engine, old reservoir shape, mounting points, hose connections, and OE number. Do not rely on the model name alone.
Can a cracked coolant reservoir cause coolant loss?
Yes. A cracked or leaking reservoir can allow coolant loss. Low coolant may also come from hoses, radiator, water pump, thermostat housing, or other cooling system components.
Does this part fix engine overheating?
This part replaces the coolant reservoir. Overheating can have multiple causes, so inspect the full cooling system if the issue continues.
Should I replace the reservoir if it is stained or hard to read?
If the tank is stained, brittle, cracked, leaking, or difficult to read, replacement may be needed to restore clear coolant level visibility.
About BDFHYK
BDFHYK focuses on OE-style replacement parts that help drivers move from vehicle symptoms to the right replacement part with less guesswork. Please contact us if you need help checking fitment before ordering.
BMW 525i 528i 530i 535i 545i 550i Coolant Reservoir Tank 2.5L 3.0L 4.4L 4.8L Replace 603-351 Z49011 | BDFHYK
Regular price
$45.99