Bremmen Parts BMW Cooling System Parts & Accessories for BMW 5 Series G30 (2017+)

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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 - 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
In Stock
Sale - Save 15% $ 223.99

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05-03-2026

$ 190.39 USD
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Sale - Save 15%
$ 223.99

This product was last offered at the strikethrough price on
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$ 190.39 USD
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Electronic Thermostat And Coolant Distribution Module
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Bremmen Parts - Corporate Logo
T#:26538308
Part#: 11537642854
In Stock
Sale - Save 5% $ 308.99

This product was last offered at the strikethrough price on
05-03-2026

$ 292.63 USD
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$ 292.63 USD
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Connector - Upgraded Aluminum Metal
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Bremmen Parts - Corporate Logo
T#:27205374
Part#: 11118511205
In Stock
Sale - Save 20% $ 42.99

This product was last offered at the strikethrough price on
05-03-2026

$ 34.39 USD
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$ 42.99

This product was last offered at the strikethrough price on
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$ 34.39 USD
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B58 Coolant Hose - Auxiliary Water Pump to Turbocharger
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Bremmen Parts - Corporate Logo
T#:36981057
Part#: 11538611277
Ships on Sep 2, 2026
Sale - Save 18% $ 60.99

This product was last offered at the strikethrough price on
05-03-2026

$ 49.99 USD
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$ 60.99

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$ 49.99 USD
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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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Coolant Outlet Connector - B58A (F3X, G30, G01/G02)
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T#:36913371
Part#: 11118619408
In Stock
Sale - Save 21% $ 32.99

This product was last offered at the strikethrough price on
05-03-2026

$ 26.10 USD
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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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Bremmen Parts - Corporate Logo
T#:36913362
Part#: 11538606278
In Stock
Sale - Save 21% $ 54.99

This product was last offered at the strikethrough price on
05-03-2026

$ 43.24 USD
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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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Coolant Expansion Tank Cap
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Bremmen Parts - Corporate Logo
T#:36032339
Part#: 17117639020
In Stock
Sale - Save 20% $ 14.99

This product was last offered at the strikethrough price on
05-03-2026

$ 11.99 USD
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$ 14.99

This product was last offered at the strikethrough price on
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$ 11.99 USD
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Water/Coolant Pump With Support
For models with the B48D, B46D, or B46X engines only and without the Energy Recovery Sy...
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Bremmen Parts - Corporate Logo
T#:49648357
Part#: 11518650988
In Stock
New Item
Sale - Save 5% $ 234.99

This product was last offered at the strikethrough price on
05-03-2026

$ 222.86 USD
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Sale - Save 5%
$ 234.99

This product was last offered at the strikethrough price on
05-03-2026

$ 222.86 USD
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Electronic Thermostat And Coolant Distribution Module
For vehicles with the later B58C or B58D engine - Will not fit the B58A early engine
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Bremmen Parts - Corporate Logo
T#:50311455
Part#: 11538843406
In Stock
New Item
Sale - Save 10% $ 397.99

This product was last offered at the strikethrough price on
05-03-2026

$ 358.01 USD
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$ 397.99

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$ 358.01 USD
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Vent Hose
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Bremmen Parts - Corporate Logo
T#:39295552
Part#: 17127576363
Special Order: No Guaranteed ETA
Sale - Save 21% $ 27.99

This product was last offered at the strikethrough price on
05-03-2026

$ 22.02 USD
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$ 27.99

This product was last offered at the strikethrough price on
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$ 22.02 USD
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