How to remove and install the Coolant Reservoir and Cooling Hose on the BMW 325i?

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 325i Coolant Reservoir

Coolant Tank Reservoir

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5 Coolant Reservoirs found

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BMW 325i 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 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
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BMW 325i 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 325i | Sedan(E90)
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BMW 325i Coolant Expansion Tank
Part Number: 17111707540
$135.56 MSRP: $164.40
You Save: $28.84 (18%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Expansion Tank; Reservoir Tank
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1992 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30)
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BMW 325i Coolant Expansion Tank
Part Number: 17111723520
$167.33 MSRP: $215.23
You Save: $47.90 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Expansion Tank; Reservoir, Reservoir Tank
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
View related parts
BMW 325i Coolant Expansion Tank
Part Number: 17111712641
$135.56 MSRP: $164.40
You Save: $28.84 (18%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Expansion Tank
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1992 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30)

BMW 325i Coolant Reservoir

The BMW 325i Coolant Reservoir protects the engine by catching expanding antifreeze, allowing the heat to be controlled and preventing harmful liquid from reaching the ground. Within the closed cooling loop, this Coolant Reservoir connects to the radiator and is located at the top of the system, allowing room to expand and contract the fluid and keep air out. As the temperature increases, pressure pushes up the cap and forces excess coolant into the tank. When the engine cools down, a vacuum pulls the liquid back to maintain the precise level. Across the years, BMW equipped 325i models with two main styles, the overflow type and the expansion type Coolant Reservoir, and the two styles handle pressure differently. Overflow versions have a plastic cap on a non-pressurized bottle, which relies on a radiator-mounted pressure cap to shuttle coolant in and out, while expansion versions have a pressure-rated cap directly on the Coolant Reservoir; in this case, the tank itself is a part of the pressurized circuit. The pressurized design makes use of heavier reinforced plastic due to exposure to heat and chemicals, a weakness of BMW 325i units whose lighter plastic cracked easily. Checking the molded level marks on a cold BMW 325i Coolant Reservoir regularly helps drivers spot cracks or leaks early and prevent overheating and environmental harm.

If you are looking for OEM BMW 325i 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 325i Coolant Reservoir that come backed by the manufacturer's warranty.

BMW 325i 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 325i?
Posted by Nikita R.
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 Brad / Feb 28, 2025