BMW Radiators & Cooling System Overhaul Kits for BMW 3 Series E46 (1999-2005)

Clear BMW chassis
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.

E46 M3 Fluidyne / Turner Aluminum Radiator Upgrade
E46 M3 Fluidyne / Turner Aluminum Radiator Upgrade
+25% capacityTriple-row core (vs double row)Better coolin...
Turner Motorsport - Corporate Logo
T#:187009
Part#: FHP13X-01E46M
In Stock
$708.95
$708.95

+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
Complete Cooling System Overhaul Package - 2001-2006 E46 M3
Complete Cooling System Overhaul Package - 2001-2006 E46 M3 ...
As the E46 M3 gets on in years and mileage, the cooling s...
Turner Motorsport - Corporate Logo
T#:338740
Part#: TMS338740
In Stock
Starting at $509.30
Free Shipping
Starting at $509.30
Free Shipping

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

ECS Tuning Aluminum Coolant Bleeder Screw
ECS Tuning Aluminum Coolant Bleeder Screw
Replace the flimsy plastic bleeder screw used in the cool...
ECS - Corporate Logo
T#:363070
Part#: 003530ECS01A
In Stock
$10.95
Free Shipping on orders $99 and up

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


Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)
Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW ...
This is the sensor / sending unit that notifies the compu...
Genuine BMW - Corporate Logo
T#:341059
Part#: 17137553919
In Stock
15% off MSRP $21.35
$18.24
Free Shipping on orders $99 and up
15% off MSRP $21.35
$18.24
Free Shipping on orders $99 and up

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


OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4
OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3...
This radiator expansion tank cap is used most BMW&#39...
Mahle-Behr - Corporate Logo
T#:2766
Part#: 17111742231
In Stock
$9.95
Free Shipping on orders $99 and up
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
BMW Expanding Rivet
BMW Expanding Rivet
The most common use for this rivet is to secure the radia...
Genuine BMW - Corporate Logo
T#:7436
Part#: 17111712963
In Stock
$0.99
Free Shipping on orders $99 and up
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.

Complete Cooling System Overhaul Package - 1999-2006 E46 323i 325i 328i 330i
Complete Cooling System Overhaul Package - 1999-2006 E46 323i 325i 3...
This is a compete cooling system overhaul kit, which incl...
Packaged by Turner - Corporate Logo
T#:340196
Part#: E46COOLINGPACK
In Stock
Sale - Save 4% $374.67
Starting at $358.88
Free Shipping
Sale - Save 4% $374.67
Starting at $358.88
Free Shipping
This is a compete cooling system overhaul kit, which includes all the common E46 cooling system failure parts bundled into a complete package. This cooling system package is for all of the non-M E46 3 series -- those made in 1999-2005 as well as 2006 coupes and convertibles.

The E46 cooling system is much like that of the previous generation 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. Our kit includes one OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat (complete with housing), radiator cap, and new hoses (as pictured).

Optional items (which can be added below):
- Original BMW antifreeze
- Upgrade the water pump to a Stewart EMP High Performance pump
- Add a new coolant expansion tank (known for cracking)
- Add a new coolant level sensor (known for failing / throwing "check coolant" messages)

This cooling system overhaul kit fits the following BMWs:
1999-2000 E46 3 Series Sedan/Wagon - 323i & 328i
1999-2000 E46 3 Series Coupe/Convertible - 323Ci & 328Ci
2001-2005 E46 3 Series Sedan/Wagon - 325i, 325xi, 330i, 330xi
2001-2006 E46 3 Series Coupe/Convertible - 325Ci, 330Ci
OEM Style Hose Clamps
OEM Style Hose Clamps
Hose clamps for radiator hoses, coolant hoses, vacuum hos...
Turner Motorsport - Corporate Logo
T#:338927
Part#: HOSE-CLAMPS
In Stock
Sale - Save 81% $2.95
Starting at $0.57
Free Shipping on orders $99 and up
Sale - Save 81% $2.95
Starting at $0.57
Free Shipping on orders $99 and up
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"

  • Expansion Tank Mounting Bracket - E46 - Manual Trans
    Expansion Tank Mounting Bracket - E46 - Manual Trans
    This Genuine BMW part is the mounting bracket from the ra...
    Genuine BMW - Corporate Logo
    T#:13180
    Part#: 17111436250
    In Stock
    15% off MSRP $71.17
    $60.81
    Free Shipping on orders $99 and up
    15% off MSRP $71.17
    $60.81
    Free Shipping on orders $99 and up
    This Genuine BMW part is the mounting bracket from the radiator to the expansion tank on E46 3 series Manual 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.aEUR<

    This item fits the following BMWs:
    1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi

    Genuine BMW Coolant Expansion Tank
    Genuine BMW - Corporate Logo
    T#:360752
    Part#: 17117573781
    In Stock
    21% off MSRP $117.77
    $92.95
    Free Shipping
    21% off MSRP $117.77
    $92.95
    Free Shipping
    Expansion Tank Mounting Bracket - E46 E85 Z4 - Auto Trans
    Expansion Tank Mounting Bracket - E46 E85 Z4 - Auto Trans
    This Genuine BMW part is the mounting bracket from the ra...
    Genuine BMW - Corporate Logo
    T#:12560
    Part#: 17111436251
    In Stock
    15% off MSRP $71.17
    $60.81
    Free Shipping on orders $99 and up
    15% off MSRP $71.17
    $60.81
    Free Shipping on orders $99 and up
    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
    Genuine BMW Coolant Expansion Tank - E46 M3
    Genuine BMW Coolant Expansion Tank - E46 M3
    This radiator coolant reservoir/expansion tank for E46 M3...
    Genuine BMW - Corporate Logo
    T#:13185
    Part#: 17112283344
    In Stock
    21% off MSRP $162.53
    $129.00
    Free Shipping
    21% off MSRP $162.53
    $129.00
    Free Shipping
    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


    Basic Cooling System Service Kit - E46 M5X 2.5L 2.8L 3.0L
    Basic Cooling System Service Kit - E46 M5X 2.5L 2.8L 3.0L
    Just like the rest of your vehicle&#39;s major system...
    Packaged by Turner - Corporate Logo
    T#:557236
    Part#: E46M5XBCKT
    In Stock
    New Item
    $279.88
    Free Shipping

    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.

    Hella Automatic Radiator -- E46 323/325/328/330
    Hella Automatic Radiator -- E46 323/325/328/330
    This is a Hella&Acirc;&nbsp;brand (OEM supplier t...
    Mahle-Behr - Corporate Logo
    T#:341065
    Part#: 17119071519
    In Stock
    $150.11
    Free Shipping

    This is a Hella brand (OEM supplier to BMW) replacement radiator for all 1999-2006 E46 3 series (non-M), including 323i, 323Ci, 328i, 328Ci, 325i, 325Ci, 330i, 330Ci, and Z4 2.5 and 3.0. Compare to BMW list price of $318! Save big, while still getting the highest quality radiator available for your BMW.

    Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

    As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

    This radiator fits the follow BMWs::
    Only for Automatic Transmission 
    1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi - Not for cars with M56 engine

    2006-2008 E85 E86 Z4 BMW Z4 M Coupe Z4 M Roadster

    Transmission Thermostat (Mounted in Expansion Tank) for E46 X3 X5 Z4
    Transmission Thermostat (Mounted in Expansion Tank) for E46 X3 X5 Z4...
    This Automatic Transmission Thermostat mounts in the cool...
    Vaico - Corporate Logo
    T#:2060
    Part#: 17111437362
    In Stock
    $25.95
    Free Shipping on orders $99 and up

    This Automatic Transmission Thermostat mounts in the coolant expansion tank and helps to regulate the transmission coolant temperature. It is common for this item to break while replacing the expansion tank. This fits E46 323i 325i 328i 330i, X3 2.5i 3.0i, X5 3.0i, Z4 2.5i 3.0i 3.0si.

    Direct from Germany, Vaico offers a staggering array of OE-grade replacement parts for brands such as BMW and Mini. Vaico offers parts that are both extremely reliable while being economical making them an excellent option fo