Genuine BMW X3 Coolant Reservoir Cap

Coolant Overflow Reservoir Cap

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6 Coolant Reservoir Caps found

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BMW X3 Radiator Cap
Part Number: 17117639020
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Screw Cap For Expansion Tank; Cap, Reservoir Cap
- Replaces: 17-11-7-521-071
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2011-2024 BMW X3 | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), M40i(G01), sDrive28i(F25), sDrive30i(G01), xDrive28d(F25), xDrive28i(F25), xDrive30e(G01), xDrive30i(G01), xDrive35i(F25)
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BMW X3 Radiator Cap
Part Number: 17117639022
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cap, Filler Cap, Reservoir Cap
- Replaces: 17-11-1-742-231
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2004-2010 BMW X3 | 2.5i(E83), 3.0i(E83), 3.0si(E83)
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BMW X3 Cap
Part Number: 17128515062
$8.25 MSRP: $9.24
You Save: $0.99 (11%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2020-2025 BMW X3 | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), M40i(G01), sDrive30i(G01), xDrive30e(G01), xDrive30i(G01)
- 2015-2017 BMW X3 | xDrive28d(F25)
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BMW X3 Cover Lid
Part Number: 17117639024
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Cap, Cover Cap, Radiator Cap, Reservoir Cap
- Replaced by: 17135A1BD89
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2018-2020 BMW X3 | M40i(G01), sDrive30i(G01), xDrive30e(G01), xDrive30i(G01)
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BMW X3 SCREW PLUG, EXPANSION TANK
Part Number: 17135A1BD89
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cap, Cover Cap, Radiator Cap, Reservoir Cap
- Position: Passenger Side
- Replaces: 17-13-2-754-264, 17-11-7-639-024
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2018-2025 BMW X3 | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), M40i(G01), sDrive30i(G01), xDrive30e(G01), xDrive30i(G01)
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BMW X3 SCREW PLUG EXPANSION TANK
Part Number: 17135A28CA5
$20.71 MSRP: $31.48
You Save: $10.77 (35%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Reservoir Cap
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2025 BMW X3 | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)

BMW X3 Coolant Reservoir Cap

The BMW X3 Coolant Reservoir Cap seals the expansion tank, which keeps coolant under pressure and engines in a comfortable range of their temperature band. By sealing out oxygen, the Coolant Reservoir Cap prevents rust and toxic fluid from splashing on the roads and maintains peak system pressure for each BMW. Its spring-loaded valve releases excess coolant into the tank when heat builds, reseating as liquid cools, which provides protection for hoses, pumps, and radiators across the entire X3 family. Fitment is very easy. The Coolant Reservoir Cap has the same thread and gasket specifications on all the X3 generations from the first 2003 SAV to today's electrified trims. Drivers have the option of the metal Coolant Reservoir Cap for maximum heat resistance or a more lightweight plastic Coolant Reservoir Cap that provides weight savings without compromising seal strength. Both versions have an internal filter zone that traps any stray metal particles, ensuring that any BMW cooling loop remains clean and efficient, whether on long commutes or spirited drives. As the pressure in the Coolant Reservoir Cap is kept stable, thermostats cycle less, fans run less, and fuel economy increases, which also means that the X3 has stable power in heavy traffic or steep climbs. Reliable sealing also avoids scalding spray in service, which is a trust that keeps passengers and wildlife safe, a credential that seals BMW trust after more than 1.8 million X3 units sold worldwide. Compact but vital, the Coolant Reservoir Cap stands out in the market with precise calibration, cross-generation compatibility, and a rugged build that allows each and every BMW to stay cooler, cleaner, and safer. Installing this factory Coolant Reservoir Cap helps to protect your BMW and maintain the balanced handling that makes the X3 a standout in the world of luxury crossovers.

If you are looking for OEM BMW X3 Coolant Reservoir Cap, 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 X3 Coolant Reservoir Cap that come backed by the manufacturer's warranty.