How to remove and install the Coolant Reservoir and Cooling Hose on the BMW 330i?

If a faulty hose is found, drain the cooling system and disconnect the hose by prying up the retaining clip or loosening the hose clamps. Avoid disconnecting while the system is hot. Some models may have twist-on clamps that need to be rotated counterclockwise. Be careful when removing hoses from the radiator, and if a hose is hard to remove, rotate the ends or slit it with a knife. To install a hose, push it over the fitting until the clip locks it. Slide clips onto hoses with traditional clips before positioning. Soften stiff hoses with soapy or hot water if needed. Refill the system and check for leaks. To remove the coolant reservoir, remove the air intake duct, disconnect the hoses, remove the bolts, unclip the reservoir, and lift it. Disconnect the coolant level switch connector and remaining hose before removing the reservoir. Installation is the reverse of removal. Refill the cooling system.

Genuine BMW 330i Coolant Reservoir

Coolant Tank Reservoir

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6 Coolant Reservoirs found

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BMW 330i Coolant Expansion Tank Bottle Reservoir
Part Number: 17117573781
$134.67 MSRP: $173.21
You Save: $38.54 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Expansion Tank; Reservoir, Reservoir Tank
- Replaces: 17-13-7-787-039, 17-11-1-436-413
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 330i | Sedan(E46)
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BMW 330i Coolant Expansion Tank
Part Number: 17137640514
$142.51 MSRP: $189.03
You Save: $46.52 (25%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Expansion Tank; Reservoir, Reservoir Tank
- Replaces: 17-13-7-519-368, 17-13-7-607-482, 17-13-7-543-026, 17-13-7-567-462
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 330i | Sedan(E90)
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BMW 330i Coolant Expansion Tank
Part Number: 17138677649
$142.51 MSRP: $189.03
You Save: $46.52 (25%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Expansion Tank; Reservoir, Reservoir Tank
- Replaces: 17-13-8-617-044
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2018 BMW 330i | Sedan(F30)
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BMW 330i Coolant Expansion Tank
Part Number: 17138617045
$122.15 MSRP: $162.02
You Save: $39.87 (25%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Expansion Tank; Auxiliary Reservoir, Reservoir
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2018 BMW 330i | Sedan(F30)
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BMW 330i Expansion Tank
Part Number: 17138610652
$149.64 MSRP: $198.48
You Save: $48.84 (25%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Reservoir Tank
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2025 BMW 330i | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G20)
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BMW 330i Expansion Tank
Part Number: 17138610653
$128.27 MSRP: $170.14
You Save: $41.87 (25%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2025 BMW 330i | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G20)

BMW 330i Coolant Reservoir

BMW 330i Coolant Reservoir manages overflow and expansion of the antifreeze water mix, keeping the engine at safe temperature and preventing toxic ethylene glycol from dripping onto the ground. In every BMW 330i, this plastic vessel, called the Coolant Reservoir, sits at the system's high point, linking to the radiator so heated coolant can expand into it, then return once temperatures drop, which also stops air pockets that could corrode components. Two configurations have appeared across BMW 330i generations. Early cars applied a non-pressurized overflow style, where the radiator wore the pressure cap and the Coolant Reservoir, sealed by a simple plastic lid, collected fluid only when pressure exceeded the cap rating. Later 330i models adopted a pressurized expansion style, and modern BMW designs placed the cap directly on the Coolant Reservoir itself. This sturdier reinforced plastic tank forms part of the pressurized loop, releasing air rather than liquid when pressure peaks while its built in space absorbs thermal growth. Regardless of version, clear level markings on the Coolant Reservoir let drivers quickly verify cold engine fill lines and spot cracks that signal replacement time.

If you are looking for OEM BMW 330i Coolant Reservoir, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 330i Coolant Reservoir that come backed by the manufacturer's warranty.

BMW 330i Coolant Reservoir Parts Questions & Experts Answers

Coolant Expansion Tank
17137640514
Q:
How to remove and install the Coolant Reservoir and Cooling Hose on the BMW 330i?
Posted by Renzo O.
A:
If a faulty hose is found, drain the cooling system and disconnect the hose by prying up the retaining clip or loosening the hose clamps. Avoid disconnecting while the system is hot. Some models may have twist-on clamps that need to be rotated counterclockwise. Be careful when removing hoses from the radiator, and if a hose is hard to remove, rotate the ends or slit it with a knife. To install a hose, push it over the fitting until the clip locks it. Slide clips onto hoses with traditional clips before positioning. Soften stiff hoses with soapy or hot water if needed. Refill the system and check for leaks. To remove the coolant reservoir, remove the air intake duct, disconnect the hoses, remove the bolts, unclip the reservoir, and lift it. Disconnect the coolant level switch connector and remaining hose before removing the reservoir. Installation is the reverse of removal. Refill the cooling system.
Answered by BMW Parts Specialist Armando / Jun 12, 2023