BMW Cooling System Parts & Accessories for BMW 4 Series F33 (2014+)

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Thermostat With Aluminum Housing - N20
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T#:30828065
Part#: 11538635689M
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$ 100.36 USD
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Electronic Thermostat And Coolant Distribution Module
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T#:26538308
Part#: 11537642854
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$ 292.63 USD
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Coolant Hose - Return Line
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T#:30729013
Part#: 17128570061
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Thermostat - B48
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For vehicles with the Gen1 B48/B46 only - not compatible with the later Gen2 B48 (TU) engines
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T#:23648673
Part#: 11537644811
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Connector - Upgraded Aluminum Metal
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T#:27205374
Part#: 11118511205
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B58 Coolant Hose - Auxiliary Water Pump to Turbocharger
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T#:36981057
Part#: 11538611277
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This Bremmen Parts Coolant Hose is designed to connect the turbocharger to the auxiliary water pump, providing a premium replacement for B58-equipped BMW models. Constructed with high-quality, heat-resistant materials, this hose ensures reliable and efficient engine cooling, even under extreme temperatures. Engineered to meet OEM specifications, it offers a precise fit and a secure connection, optimizing coolant flow to maintain the performance and longevity of your BMW’s turbocharged engine.

Key Benefits:

Premium Materials: Crafted from heat-resistant materials to endure high-temperature conditions. OEM-Compatible Fit: Matches BMW’s original specifications for an easy, hassle-free installation. Enhanced Cooling: Designed to support efficient coolant flow in turbocharged engines. Durable Construction: Built to last, minimizing the need for frequent replacements and ensuring long-term reliability.

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Engine Coolant Expansion Tank
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T#:30729009
Part#: 17138677649
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$ 75.59 USD
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Hose F Engine Inlet-Changeover Valve
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T#:30729011
Part#: 17128616914
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$ 56.30 USD
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Coolant Outlet Connector - B58A (F3X, G30, G01/G02)
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T#:36913371
Part#: 11118619408
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$ 26.10 USD
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The Coolant Outlet Connector connects the engine block coolant outlet to the upper radiator hose.

Due to fragile plastic construction and consistent exposure to hot, chemical-rich engine coolant, this piece is prone to degradation and (potentially) complete failure.

Whether you're fixing a failed connector or preemptively replacing this failure-prone component, choose this quality replacement from Bremmen Parts for a lasting repair.

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Junction Heat Hose - 11538606278
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T#:36913362
Part#: 11538606278
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This junction heat hose, made from rubber, is prone to cracking, dry rot, and brittleness over time, often leading to coolant leaks at the front of the engine. Such leaks pose a significant risk to your engine’s health, as rapid coolant loss can cause overheating and severe damage.

Replace your worn or leaking heat hose with this high-quality OE replacement from Bremmen Parts. Engineered for a precise fit and long-lasting performance, this hose ensures a reliable repair and helps protect your engine from potential overheating.

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Cylinder Head Expansion Tank Hose - Priced Each
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T#:30729010
Part#: 17129845173
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$ 24.47 USD
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Dinan High-Performance Heat Exchanger - F22/23 F3X B46/48 B58 ...
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T#:21045539
Part#: D780-0002
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11% off MSRP $ 658.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 584.99 USD
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$ 658.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 584.99 USD
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The factory B4x/B58 heat exchanger is not built to cater to the rigorous demands often associated with a modified build. The thin core is easily overwhelmed with IAT's rising dramatically once pushed beyond a few successive WOT pulls or even a few minutes at the track. This elevation in temperature gives way to the factory ECU fail safes pulling timing and reducing overall power in order to keep the system from overheating to the point of permanent damage. On an application where enjoyment is directly attributed to pushing the platform to its limits this constraint to cooling presents a challenge for the automotive enthusiast. The Dinan B4x/B58 heat exchanger for the F2x/F3x chassis assists in mitigating these issues with a more robust core (48mm thick Dinan core vs. 27mm thick OEM core) that wields 78% more heat transfer surface area for improved cooling capacity. The significant increase in core thickness requires unique "L" shaped end tanks to be incorporated as well, which also contributes to the overall thermal mass (ability to absorb, store, and release heat) improvement beyond the OEM setup. With up to a 15° IAT delta recorded over stock the Dinan heat exchanger is ready, and able, to assist in extending your vehicles ability to deliver maximum performance time and time again for your driving enjoyment! Features: Average of 8° reduction in IAT's with a maximum reduction of 15° over 15 successive WOT pulls Reduces the tendency to heat soak / go in to limp mode 48mm thick Dinan cooler vs. 27mm thick stock cooler 78% more cooling surface area and volume than stock 100% TIG welded and pressure tested Installation hardware included (inclusive of xDrive specific transmission oil cooler brackets) NOTE: Due to the enlarged core and unique "L" shaped endtanks minor modification to the plastic core stack shroud may be required with some factory configurations ( particularly those with the optional OEM hot climate heat exchanger). Consult the installation PDF for full documentation on what exactly that entails. (https://documents.dinancars.com/d780-0002.pdf)
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Coolant Hose - Upper
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T#:30729014
Part#: 17127604542
Ships on Aug 24, 2026
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$ 36.89 USD
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Coolant Hose - Upper
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T#:30729016
Part#: 17127596837
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$ 52.22 USD
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Coolant Expansion Tank Cap
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T#:36032339
Part#: 17117639020
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$ 11.99 USD
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Bremmen Water Pump Bolt - M8x34 - BMW N20 2.0L
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T#:36913363
Part#: 11517602125
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$ 3.26 USD
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This external torx head screw is a direct replacement for the costly OEM screw, which must be replaced during every water pump service.

Quantity 3 required for complete replacement.


Coolant Hose - Lower
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T#:48125816
Part#: 17127596838
Ships on Aug 10, 2026
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$ 26.34 USD
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Connects the radiator to the thermostat.

Maintain optimal cooling performance with this high-quality Lower Radiator Hose (17127596838), built to match OEM dimensions for a seamless fit on your BMW. Designed to handle high heat and constant pressure, it ensures consistent coolant flow from the radiator to the thermostat housing. Perfect for preventative maintenance or replacing a failing hose, this direct-fit component helps safeguard your engine from overheating and keeps your cooling system operating at peak efficiency.

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