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This product was last offered at the strikethrough price on
07-16-2026
This product was last offered at the strikethrough price on
07-16-2026
This product was last offered at the strikethrough price on
07-16-2026
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:
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:
This cooling overhaul package fits:
2001-2006 E46 BMW M3
This product was last offered at the strikethrough price on
08-24-2026
This product was last offered at the strikethrough price on
08-24-2026
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:
This product was last offered at the strikethrough price on
05-29-2026
This product was last offered at the strikethrough price on
05-29-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-17-2026
This product was last offered at the strikethrough price on
08-17-2026
This product was last offered at the strikethrough price on
08-17-2026
This product was last offered at the strikethrough price on
08-17-2026
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 with the M52/54 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.
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
2001-2002 E46 3 Series Sedan/Wagon - 325i, 325xi, 330i, 330xi
2001-2002 E46 3 Series Coupe/Convertible - 325Ci, 330Ci
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
06-23-2026
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, a performance Mishimoto 70*C thermostat, for lower temperature operation and increased cooling of the engine, and a Stewart High Performance Water Pump, for dramatically increased coolant flow at all RPMs.
Additional items included in this kit:
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
08-19-2026
This product was last offered at the strikethrough price on
07-28-2026
This product was last offered at the strikethrough price on
07-28-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
06-15-2026
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, a performance Mishimoto 70*C thermostat, for lower temperature operation and increased cooling of the engine, and a Stewart High Performance Water Pump, for dramatically increased coolant flow at all RPMs.
Additional items included in this kit:
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
08-26-2026
The hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the plastic components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.
This kit includes the needed hoses, oil separator, and hardware.
Fits the following BMWs:
09/2004-2006 E46 BMW M3 - Manual Transmission
This product was last offered at the strikethrough price on
08-26-2026
The hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the plastic components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.
This kit includes the needed hoses, oil separator, and hardware.
Fits the following BMWs:
2001-09/2004 E46 BMW M3 - Manual Transmission