BMW Cooling System Parts & Accessories for BMW Z Series E85/6 (2003-2008)

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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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Water Pump And Thermostat Kit - BMW N52 3.0L
Water Pump And Thermostat Kit - BMW N52 3.0L
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Packaged by Turner - Corporate Logo
T#:17073598
Part#: 11537549476KT
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$ 424.99

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Includes everything you may need to replace your water pump and thermostat.
Water Pump And Thermostat Kit
Water Pump And Thermostat Kit
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T#:5376274
Part#: 11517586925TKT
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$ 337.56 USD
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$ 448.99

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Everything you need to replace your water pump and thermostat. The water pumps in these BMW models are known for failure near 80,000 miles is a very common issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Water pump Genuine BMW coolant thermostat to water pump hose Mounting hardware required for both the thermostat and water pump
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Complete Cooling System Overhaul Package - 2003-4/2004 Z4 2.5 3.0
Complete Cooling System Overhaul Package - 2003-4/2004 Z4 2.5 3.0 ...
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Packaged by Turner - Corporate Logo
T#:339100
Part#: TMS224320
Ships in 1-2 days
Sale - Save 8% $ 515.99

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$ 515.99

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This is a customizable cooling system overhaul kit, which starts off with the basic radiator and water pump and can be configured to replace all the M54 common cooling system failure parts in one package. This cooling system package is for the 2003-2005 Z4 Roadster.

The Z4 cooling system is much like that of the sister 3 series. Several of the primary cooling components are prone to failure within 60k miles (or less in many cases). A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the radiator & waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your cooling system. Available with our kit is an OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat (complete with housing), radiator cap, new hoses, and other essential cooling parts.

Optional items (which can be added below):
  • Radiator cap
  • Major cooling hoses
  • Original BMW antifreeze
  • Upgrade the water pump to a Stewart EMP High Performance pump
  • Add a new coolant expansion tank (known for cracking)
  • Include a new coolant level sensor (known for failing / throwing "check coolant" messages)
  • Include a new coolant temp sensor (located in the lower radiator hose) (re-using the old sensor and seal may lead to a leak)
  • Add a new thermostat for an automatic transmission (located with the expansion tank).
    This cooling system overhaul kit fits the following BMWs:
    2003-2005 E85 BMW Z4 2.5i Z4 3.0i

    Please put a check in the boxes next to the items you wish to order.
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    Water Pump And Thermostat Kit
    Water Pump And Thermostat Kit
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:15511872
    Part#: 821414677040KT
    Ships in 4 Business Days
    $ 504.01 USD
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    $ 504.01 USD
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    The water pumps in these BMW models are known for failure near 80,000 miles is a very common issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Water pump Genuine BMW coolant Mounting hardware required for both the thermostat and water pump
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    OEM Style Hose Clamps
    OEM Style Hose Clamps
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    Turner Motorsport - Corporate Logo
    T#:338927
    Part#: HOSE-CLAMPS
    In Stock
    Sale - Save 3% $ 3.99

    This product was last offered at the strikethrough price on
    06-13-2026

    Starting at $ 3.87 USD
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    $ 3.99

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    06-13-2026

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    Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.
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    Expansion Tank Replacement Kit
    Expansion Tank Replacement Kit
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    Packaged by Turner - Corporate Logo
    T#:15744017
    Part#: N524ECSTNKKT-KT
    In Stock
    Sale - Save 40% $ 166.99

    This product was last offered at the strikethrough price on
    04-03-2026

    $ 100.95 USD
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    $ 166.99

    This product was last offered at the strikethrough price on
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    The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. The kit includes: Expansion tank with level sensor URO expansion tank cap Genuine BMW expansion tank grommet Genuine BMW mounting bolts
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    Complete Cooling System Overhaul Package - 4/2004-2005 Z4 2.5 3.0
    Complete Cooling System Overhaul Package - 4/2004-2005 Z4 2.5 3.0 ...
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:339099
    Part#: TMS16430
    Ships in 1-2 days
    Sale - Save 8% $ 515.99

    This product was last offered at the strikethrough price on
    08-17-2026

    Starting at $ 477.24 USD
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    Sale - Save 8%
    $ 515.99

    This product was last offered at the strikethrough price on
    08-17-2026

    Starting at $ 477.24 USD
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    This is a customizable cooling system overhaul kit, which starts off with the basic radiator and water pump and can be configured to replace all the M54 common cooling system failure parts in one package. This cooling system package is for the 2003-2005 Z4 Roadster.

    The Z4 cooling system is much like that of the sister 3 series. Several of the primary cooling components are prone to failure within 60k miles (or less in many cases). A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the radiator & waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your cooling system. Available with our kit is an OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat (complete with housing), radiator cap, new hoses, and other essential cooling parts.

    Optional items (which can be added below):
  • Radiator cap
  • Major cooling hoses
  • Original BMW antifreeze
  • Upgrade the water pump to a Stewart EMP High Performance pump
  • Add a new coolant expansion tank (known for cracking)
  • Include a new coolant level sensor (known for failing / throwing "check coolant" messages)
  • Include a new coolant temp sensor (located in the lower radiator hose) (re-using the old sensor and seal may lead to a leak)
  • Add a new thermostat for an automatic transmission (located with the expansion tank).
    This cooling system overhaul kit fits the following BMWs:
    4/2004-2005 E85 BMW Z4 2.5i Z4 3.0i

    Please put a check in the boxes next to the items you wish to order.
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    Genuine BMW Thermostat With Housing - M52 M54
    Genuine BMW Thermostat With Housing - M52 M54
    Genuine BMW - Corporate Logo
    T#:360689
    Part#: 11537509227
    In Stock
    Sale - Save 8% $ 169.69

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

    $ 156.96 USD
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    $ 169.69

    This product was last offered at the strikethrough price on
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    Genuine BMW Radiator Hose - Lower - Z4 2.5i 3.0i M54
    Genuine BMW Radiator Hose - Lower - Z4 2.5i 3.0i M54
    For roadster models with production date up to 04/2004
    Genuine BMW - Corporate Logo
    T#:22531
    Part#: 17127514405
    In Stock
    Sale - Save 8% $ 99.99

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

    $ 91.99 USD
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    $ 99.99

    This product was last offered at the strikethrough price on
    05-13-2026

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    Genuine BMW Water Hose -
    This item fits the following BMW Chassis:
    E85

    Fits BMW Engines including:
    M54

    Genuine BMW Radiator Support Bracket - E92 Z4 E65 E60 E53 E46 E66 E83 E90 E91
    Genuine BMW Radiator Support Bracket - E92 Z4 E65 E60 E53 E46 E66 E83...
    Genuine BMW - Corporate Logo
    T#:21736
    Part#: 17117514402
    Ships in 4 Business Days
    Sale - Save 8% $ 26.99

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

    $ 24.86 USD
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    $ 26.99

    This product was last offered at the strikethrough price on
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    $ 24.86 USD
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    Genuine BMW Bracket F.Radiator
    This item fits the following BMW Chassis:
    E46 M3,E85 Z4M,E53 48IS,E46,E53 X5 X5,E65,E83 X3,E85 Z4,E86 Z4,E90,E92,E93

    Genuine BMW Radiator Bracket - Lower - E46
    Genuine BMW Radiator Bracket - Lower - E46
    Genuine BMW - Corporate Logo
    T#:21734
    Part#: 17111436264
    In Stock
    Sale - Save 10% $ 33.99

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

    $ 30.54 USD
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    $ 33.99

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    Genuine BMW Bracket F.Radiator
    This item fits the following BMW Chassis:
    E46 M3,E46,E85 Z4

    Fits BMW Engines including:
    M52,M54,M56,S54

    Additional Water Pump - E90, E92, E93, Z4
    Additional Water Pump - E90, E92, E93, Z4
    Genuine BMW - Corporate Logo
    T#:24649
    Part#: 64118369806
    In Stock
    Sale - Save 8% $ 279.99

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

    $ 258.45 USD
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    $ 279.99

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    Genuine BMW Additional Water Pump
    This item fits the following BMW Chassis:
    E85 Z4M,E85 Z4,E86 Z4,E90,E92,E93

    Genuine BMW Coolant Hose - N52 3.0L
    Genuine BMW Coolant Hose - N52 3.0L
    Genuine BMW - Corporate Logo
    T#:360692
    Part#: 11537521049
    In Stock
    Sale - Save 11% $ 73.99

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

    $ 65.99 USD
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    07-16-2026

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    This is a Genuine BMW coolant host that connects from the water pump to the thermostat. Replace your leaking coolant hose to prevent overheating issues and coolant loss.
    Engine Coolant Recovery Tank Hose - Z4
    Engine Coolant Recovery Tank Hose - Z4
    Genuine BMW - Corporate Logo
    T#:22338
    Part#: 11537836597
    In Stock
    Sale - Save 9% $ 55.99

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

    $ 51.19 USD
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    Genuine BMW Water Hose
    This item fits the following BMW Chassis:
    E85 Z4M,E85 Z4,E86 Z4

    Fits BMW Engines including:
    S54

    Genuine BMW Radiator Mounting Plate for Expansion Tank - Z4
    Genuine BMW Radiator Mounting Plate for Expansion Tank - Z4
    Genuine BMW - Corporate Logo
    T#:45825
    Part#: 17112248408
    In Stock
    Sale - Save 8% $ 95.99

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

    $ 87.93 USD
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    $ 95.99

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    Genuine BMW Mounting Plate -
    This item fits the following BMW Chassis:
    E85,E86

    Fits BMW Engines including:
    M54,N52

    Genuine BMW Water Pump Pulley
    Genuine BMW Water Pump Pulley
    Genuine BMW - Corporate Logo
    T#:4472
    Part#: 11511436590
    In Stock
    Sale - Save 7% $ 73.99

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

    $ 68.99 USD
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    SEE T#337981
    Genuine BMW Low Radiator Hose - Z4 N52
    Genuine BMW Low Radiator Hose - Z4 N52
    Genuine BMW - Corporate Logo
    T#:19533
    Part#: 17127545263
    In Stock
    Sale - Save 10% $ 88.99

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

    $ 79.70 USD
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    Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

    Genuine BMW radiator hoses are always a perfect option when performing maintenance thanks to their high quality and longevity.

    This item fits the following BMW Chassis:
    E85,E86

    Fits BMW Engines including:
    N52

     

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    Expansion Tank Mounting Bracket - E46 E85 Z4 - Auto Trans
    Expansion Tank Mounting Bracket - E46 E85 Z4 - Auto Trans
    For vehicles with automatic transmission only
    Genuine BMW - Corporate Logo
    T#:12560
    Part#: 17111436251
    In Stock
    Sale - Save 51% $ 205.99

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

    $ 101.32 USD
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    $ 205.99

    This product was last offered at the strikethrough price on
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    This Genuine BMW part is the mounting bracket from the radiator to the expansion tank on E46 3 series and E85/E86 Z4 with Automatic Transmission.

    When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

    This item fits the following BMWs:
    1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
    2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si
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    Meyle Expansion Tank Cap
    Meyle Expansion Tank Cap
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    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:579357
    Part#: 3148009004
    In Stock
    Sale - Save 40% $ 14.99

    This product was last offered at the strikethrough price on
    05-15-2026

    $ 8.99 USD
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    $ 14.99

    This product was last offered at the strikethrough price on
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    $ 8.99 USD
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    Replace worn or missing pieces.

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