BMW Radiators & Cooling System Overhaul Kits for BMW E46 (1999-2005) M3

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We sell only OEM Behr, Original BMW, or approved aftermarket upgrade radiators for your BMW. It seems BMW took some shortcuts when it came to radiator design and used too many weak materials like plastic for critical connections. The core and sizing of the radiators are generally sufficient for the intended application but problems can occur at hose connections, upper or lower necks, and plastic end tanks. The radiators we sell are all OEM designs to keep the quality high. In some cases the OEM has made design improvements to prevent past issues. There are a number of non-OEM replacement radiators that use even cheaper materials and poor workmanship which only leads to more problems. On some models we offer OEM alternatives that perform as upgrades to the original designs and we also offer full race all-aluminum radiator upgrades that solve all of the issues with plastic radiators.

ECS Tuning Aluminum Coolant Bleeder Screw
ECS - Corporate Logo
T#:363070
Part#: 003530ECS01A
In Stock
Sale - Save 25% $9.95
$7.46
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Sale - Save 25% $9.95
$7.46
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Replace the flimsy plastic bleeder screw used in the coolant expansion tank or in one of the cooling system hoses with this high quality, durable, aluminum bleeder screw. The stock plastic screw can deform over time due to heat or even regular use. We have even seen the head of the screw snap off, leaving the threaded body stuck in the expansion tank. This aluminum screw will help to prevent sudden failure of the bleeder screw, which can result in immediate overheating of the car.

ECS Tuning's Aluminum Coolant Bleeder Screw replaces Genuine BMW Part Number 17111712788

E46 M3 Fluidyne / Turner Aluminum Radiator Upgrade
Turner Motorsport - Corporate Logo
T#:187009
Part#: FHP13X-01E46M
In Stock
Sale - Save 5% $694.95
$660.20
Sale - Save 5% $694.95
$660.20

+25% capacity

  • Triple-row core (vs double row)
  • Better cooling without increasing overall dimensions
  • All-aluminum construction

This is the new E46 M3 aluminum radiator that we collaborated with FLUIDYNE on. We're taking advantage of FLUIDYNE's new core design that packs much more surface area in a stock-sized core. Instead of the usual two rows of tubes, FLUIDYNE's all-aluminum radiator has three rows of tubes in a core no thicker than the stock radiator. This radiator also has 30% more rows than the stock radiator (55 vs 42). With greater surface area and more efficient use of air flow comes better cooling, especially in the most critical spot where the fins meet the tubes, as this is where most of the heat transfer happens. Where most other aluminum radiators use a thicker core, FLUIDYNE's new packaging solution performs better and fits better in the engine bay with better clearance to other components. A second benefit with this new core is that it minimizes added weight gain, helping to get the car as light - and as fast - as possible.

FLUIDYNE made this easy as this core is no larger than the stock radiator even though it has more capacity. We also had hangers designed to accommodate the factory oil cooler and fan shroud. There has never been a better E46 M3 radiator upgrade than this! For an E46 M3 track or modded street car there should be no reason to ever go back to a stock plastic radiator or compromise on a cheap aluminum radiator. The latest FLUIDYNE is the best there is.

The stock radiator has an aluminum core but with plastic end-tanks and hose connections that become brittle and can leak or crack. You may not even realize your radiator neck is cracked until it's too late and you're stranded on the side of the freeway or unable to continue with your track day. An all-aluminum design does not suffer the defects of similar plastic construction. FLUIDYNE quality is what sets them apart from every other manufacturer. Their radiators feature a high-tech CAB-brazed core construction instead of epoxy (which can leak). All tanks and brackets are TIG welded by hand in the USA. If you plan on owning your BMW for many years to come, or are using it in a situation where failure is NOT an option such as track or racing, then this should be your only option instead of the failure-prone stock radiators.

Some modifications may be needed to to fit this radiator.

  • This radiator fits the following BMWs:
    2001-2006 E46 BMW M3
Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)
Genuine BMW - Corporate Logo
T#:341059
Part#: 17137553919
In Stock
16% off MSRP $21.35
$17.95
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16% off MSRP $21.35
$17.95
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This is the sensor / sending unit that notifies the computer if your coolant level is low. When this fails, it can give a false indication of low coolant -- or worse, not inform you of a low coolant situation which could potential cause overheating. (Note: This sensor is also found in the windshield washer container, to alert the computer when you are low on washer fluid)

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 sensor also serves as the washer fluid level sensor on many models.

This fluid level sensor is found on the following BMWs:
1999-2005 E46 3 Series - 323i, 323Ci, 328i, 328Ci, 325i, 325ix, 325Ci, 330i, 330ix, 330Ci
2001-2006 E46 M3
2000-2003 E39 M5 Coolant Level Sensor only
2006-newer E90/E92 3 Series - 325i, 325xi, 328i, 328xi, 330i, 330xi, 335i, 335xi M3
2004-2009 E60 5 Series - 525i, 525xi, 528i, 528xi, 530i, 530xi, 545i, 550i, M5
2004-2009 E63/E64 6 Series - 645Ci, 650i, M6
2002-2009 E65/E66 7 Series - 745i, 745Li, 750i, 750Li, 760i, Alpina B7
2004-2009 X3 SAV - X3 2.5i, X3 3.0i, X3 3.0si
2000-2006 E53 X5 X5 3.0i X5 4.4i X5 4.6is X5 4.8is
2007+ E70 X5 X5 3.0si X5 4.8i X5 xDrive30i X5 xDrive48i X5M
2007+ E71 X6 X6 xDrive35i X6 xDrive50i X6M
2003-2009 Z4 Roadster/Coupe - Z4 2.5i, Z4 3.0i, Z4 3.0xi, MZ4 Roadster & Coupe
2000-2003 E52 Z8 Z8 Roadster - Coolant Level Sensor only


FAE Coolant Temperature Sensor - E46 E39 E82 E9X E60 E63 E38 E65 X3 X5 Z4
FAE - Corporate Logo
T#:2472
Part#: 13621433077
In Stock
$19.95
$19.95
This Cooling system temperature sensor mounts into the lower radiator hose.

This item fits the following BMWs:
2008+ E82 BMW 128i
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
2006+ E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi
2007+ E92 BMW 328i 328xi 328i xDrive
2007+ E93 BMW 328i
1999-2003 E39 BMW 525i 528i 530i 540i M5
2004-2010 E60 BMW 525i 525xi 530i 530xi 545i 550i M5
2004+ E63 BMW 645ci 650i M6
1999-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i X5 4.4i X5 4.6is X5 4.8is
2007-2013 E70 BMW X5 3.0si X5 4.8i X5 xDrive30i X5 xDrive48i X5M
2007-2014 E71 BMW X6 xDrive50i X6M
2003-2008 Z4 BMW Z4 2.5i Z4 3.0i Z4 3.0si Z4 M Roadster M Coupe

Genuine BMW Coolant Expansion Tank - E46 M3
Genuine BMW - Corporate Logo
T#:13185
Part#: 17112283344
In Stock
21% off MSRP $162.53
$129.00
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21% off MSRP $162.53
$129.00
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This radiator coolant reservoir/expansion tank for E46 M3 is a common failure item as the plastic weakens over time and stress crack will lead to coolant leaks. If your car has over 80k miles and hasn't had one of these replaced, we highly recommend it during your next major service. We have found that the aftermarket coolant reservoirs fail easier than the original BMW piece so we only offer the BMW type on this part.

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:
2001-2006 E46 BMW M3
BMW Expanding Rivet
Genuine BMW - Corporate Logo
T#:7436
Part#: 17111712963
In Stock
$0.99
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The most common use for this rivet is to secure the radiator fan shroud to the radiator. This rivet can also be used on a wide variety of other applications as well.

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.

OEM Style Hose Clamps
Turner Motorsport - Corporate Logo
T#:338927
Part#: HOSE-CLAMPS
In Stock
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Starting at $0.57
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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.

Features:
  • 9mm band width
  • 6mm hex & slotted head
  • Smooth inside of band = optimal hose protection
  • OEM
  • 430 Stainless steel band and housing with zinc plated steel screw
  • Asymmetric housing = even distribution of forces and prevents tilting of the clamp when tightening
  • Screw support = ease of assembly due to the safe guidance of the emerging band
  • Short housing saddle = even contact pressure = improved efficiency

    Part NumberDescriptionClamping Range in MMClamping Range in Inches
    008-12T8-12 HOSE CLAMP8mm-12mm5/16"-1/2"
    008-16T8-16 HOSE CLAMP8mm-16mm5/16"-5/8"
    012-20T12-20 HOSE CLAMP12mm-20mm1/2"-3/4"
    016-27T16-27 HOSE CLAMP16mm-27mm5/8"-11/16"
    020-32T20-32 HOSE CLAMP20mm-32mm3/4"-1 1/4"
    025-40T25-40 HOSE CLAMP25mm-40mm1"-1 5/8"
    030-45T30-45 HOSE CLAMP30mm-45mm1 3/16"-1 3/4"
    032-50T32-50 HOSE CLAMP32mm-50mm1 3/8"-2"
    040-60T40-60 HOSE CLAMP40mm-60mm1 5/8"-2 3/8"
    050-70T50-70 HOSE CLAMP50mm-70mm2"-2 3/4"
    060-80T60-80 HOSE CLAMP60mm-80mm2 3/8"-3 1/8"
    070-90T70-90 HOSE CLAMP70mm-90mm2 3/4"-3 1/2"
    080-100T80-100 HOSE CLAMP80mm-100mm3 1/8"-4"
    090-110T90-110 HOSE CLAMP90mm-110mm3 1/2"-4 3/8"
    110-130T110-130 HOSE CLAMP110mm-130mm4 3/8"-5 1/8"
  • OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4
    Mahle-Behr - Corporate Logo
    T#:2766
    Part#: 17111742231
    In Stock
    $9.95
    $9.95
    This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

    Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

    This item fits the following BMWs:
    1990-1991 E30 BMW 318i 318is 318ic
    1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
    1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
    1989-1995 E34 BMW 530i 535i 540i M5
    1991-1995 E34 BMW 525i
    1997-2003 E39 BMW 525i 528i 530i 540i M5
    1989-1994 E32 BMW 735i 735il 740i 740il 750il
    1995-2001 E38 BMW 740i 740il 750il
    2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
    1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
    2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
    2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
    1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
    2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
    2000-2003 E52 BMW Z8 Z8 Alpina
    2007+ E90 BMW 335i & 335xi

    Complete Cooling System Overhaul Package - 2001-2006 E46 M3
    Turner Motorsport - Corporate Logo
    T#:338740
    Part#: TMS338740
    In Stock
    Sale - Save 5% $509.30
    Starting at $486.38
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    As the E46 M3 gets on in years and mileage, the cooling system will be one of the areas that needs the most attention. We have packaged all of the major cooling components into one overhaul kit:

    • radiator
    • water pump
    • thermostat
    • radiator hoses and clamps
    • gaskets and o-rings

    We have found that the E46 M3 can develop inconvenient cooling issues, even on daily driven street cars. While the infamous radiator and water pump failures of the E36 are a thing of the past, the E46 M3 still has its own complications. The best approach to avoid bigger problems is preventative maintenance. We recommend replacing the water pump before 80,000 miles and the radiator before 100,000 miles. By addressing these problem areas before a failure, you will save yourself a larger repair bill in the future.

    In addition to the standard cooling package items above, there are several other cooling-related components that may make sense to do at the same time:

    • Original BMW coolant
    • fan clutch
    • main serpentine belt and A/C belt
    • Turner Power Pulley Kit (because now is the perfect time!)

    This cooling overhaul package fits:
    2001-2006 E46 BMW M3


    CSF High Performance Aluminum Radiator - E46 M3
    CSF - Corporate Logo
    T#:384654
    Part#: 7058
    In Stock
    $549.00
    $549.00

    CSF is one of the premier cooling product specialists available on the market thanks to designs such as their High Performance Aluminum Radiators. Using a two-row, triple-pass designed core, this radiator gives you all the cooling you could ever need. Paired with these radiators are CNC machined brackets and corrosion resistant hardware that allow final installation to have a same as stock fitment! This enables you to have much higher cooling without having to cut away any metal or delete any important components just for the sake of lower coolant temperatures.

    Features:

    • Two-row, triple-pass design radiator core
    • CNC machined mounting brackets
    • All needed hardware included
    • Hand polished aluminum with a mirror-like finish
    • Stock fitment prevents modification to engine bay

    Fits the following BMWs:
    2001-2006 E46 BMW M3

    Basic Cooling System Service Kit - E46 BMW M3
    Packaged by Turner - Corporate Logo
    T#:557246
    Part#: E46M3BCKT
    In Stock
    Sale - Save 5% $375.00
    $356.25
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    $356.25
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    Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

    To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

    See kit contents below for all included components.

    E46 M3 Mishimoto Performance Aluminum Radiator
    Mishimoto - Corporate Logo
    T#:378511
    Part#: MMRADE4601
    In Stock
    $596.25
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    Mishimoto Aluminum Radiator features -

    • All aluminum construction
    • More durable and longer lasting than plastic components
    • 30% more capacity in the same space
    • Excellent fit and finish
    • Unbeatable lifetime warranty and accident-forgiveness

    Mishimoto radiators address all of the defects of the stock E46 radiator in a well-engineered and price-competitive direct replacement unit. The Mishimoto radiator is an all aluminum design that replaces the factory plastic and aluminum stock radiator. The stock plastic end tanks are notorious for cracking and leaks whereas the Mishimoto has aluminum end tanks that will never fail. Mishimoto can also build 30% more coolant capacity into the a radiator that fits in the original location with no modifications. More coolant volume means the fluid is not heat soaked for as long (less super heated fluid circulating through the engine). For a direct replacement performance radiator, the Mishimoto is hard to beat!

    Mishimoto was established in 2003 as a supplier of cooling components for drift and rally cars. Their radiators and intercoolers soon found a strong following in the hyper competitive drift scene where high horsepower and prolonged high revs dictate the need for durable and robust cooling solutions. The catchy Mishimoto name is a combination of the name of the founder's family pet - Mishi - and "moto". All products are designed and tested in the USA using state-of-the-art CAD tools and prototyping and with continuous evolution of product design. Mishimoto is so dedicated to quality that they offer a limited lifetime warranty and accident forgiveness.



    Cooling System overhaul Kit - E46 M3
    Packaged by Turner - Corporate Logo
    T#:554122
    Part#: 17127510952KT10
    In Stock
    Sale - Save 5% $930.70
    $884.17
    Sale - Save 5% $930.70
    $884.17
    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the E46 M3 with the S54 engine.

    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 thermostat housing, radiator, and 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 entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts.
    Basic Cooling System Service Kit - E46 BMW M3 w/ Saleri Pump
    Packaged by Turner - Corporate Logo
    T#:557927
    Part#: E46M3BCKT1
    Direct Ship
    Sale - Save 5% $390.06
    $370.56
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    $370.56
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    Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

    To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

    See kit contents below for all included components.

    High Performance Cooling System Upgrade - E46 M3
    Packaged by Turner - Corporate Logo
    T#:557315
    Part#: E46MPCKT
    On Order, ETA Dec 24, 2018
    Sale - Save 5% $1,568.49
    $1,490.07
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    Sale - Save 5% $1,568.49
    $1,490.07
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    If you plan to drive your BMW aggressively on the track, it is important that you upgrade your cooling system to avoid overheating. To ensure your BMW keeps cool on the track, we have built out our new High Performance Cooling System Upgrade kits. Featured in this kit is everything you will need to redo your cooling system from top to bottom with OEM components, with select stock components swapped out for the high performance alternative! This kit includes a high performance Mishimoto Radiator for significantly better cooling than the stock radiator and full aluminum construction that won't crack from long term heat cycling, and a Genuine BMW Motorsport 55*C thermostat, for lower temperature operation and increased cooling of the engine.

    Additional items included in this kit:

    • ECS Tuning Silicone Replacement Coolant Hoses - For increased reliability over stock rubber hoses
    • ECS Tuning Heavy Duty Aluminum Bleeder Screw
    • OEM Expansion Tank, Cap, and Level Sensor
    • OEM Belts, Tensioners, and Pulleys
    • OEM Auxiliary Fan Switch
    • Genuine BMW Hardware for Easy Installation
    • ECS Tuning Aluminum Water Pump Pulley - For increased reliability over the stock composite pulley

    E46 M3 OEM Radiator
    Modine - Corporate Logo
    T#:1331
    Part#: 17102228941
    Back Ordered, Contact Us
    $359.95
    $359.95
    OEM Modine brand radiator for E46 M3. This is the direct replacement for the stock, original radiator.

    This item fits the following BMWs:
    2001-2006 E46 BMW M3 Coupe, M3 Convertible

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    • Radiators & Cooling System Overhaul Kits