Coolant Expansion Tank Overhaul Package - E46 Automatic

Resolve a leaking E46 expansion tank with one package

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This package includes most of the items that could cause a leak from the E46 expansion tank. If you're not sure where your leak is coming from you can give the whole area an overhaul using these parts. Most likely it will be from the expansion tank itself but in some cases it could also be from a damaged seal or connector. The automatic transmission models have even more chances of leaks due to the transmission oil cooler also mounted with the expansion tank. We have put this package together with a discount to save you money.

Parts list:
  • OEM expansion tank, #17117573781
  • OEM expansion tank cap, #17117639022
  • Quality aftermarket upper radiator hose, #17127510952
  • OE BMW installation clamp, #17111707777
  • OEM coolant level sensor, #17137553919
  • OEM transmission thermostat, #17111437362
  • OE BMW o-rings for transmission cooler, #17111711987
The only items not included are fresh BMW coolant, heater return hose, and the expansion tank mounting plate. The return hose is not a common source for leaks so its optional (it's also a pain to replace). The mounting plate holds the tank, transmission thermostat, and the transmission cooler (heat exchanger). There are lots of places for it to leak but the cause is usually a bad o-ring and not the mounting plate itself. We have included the o-rings but you can also order the plate on its own if you prefer. Buying a new mounting plate will make installation easier because you can assemble almost everything off the car where there is more room. If your coolant is more than two years old it should be replaced. You can add some to your order from the options below or pick it up locally and save the shipping cost.

This kit fits cars with automatic transmission only.

BMW Fitments:

3 Series
E46 (99-05) > 320i
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
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