Coolant Expansion Tank with Cap for BMW E90 3 Series

E90

$36.98

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Key Features

Replacement expansion tank with cap included
Fits E90, E91, E92, E93 3 Series applications
Common fix for cracked or leaking original reservoir
Stock-style solution for 328i, 330i, 335i
Verify hose ports and sensor fit before install
Best replaced during broader cooling system service

Product Details

Category: Expansion Tanks
ASIN: B0CXX89SQW

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Coolant Expansion Tank with Cap for BMW E90 3 Series — Overview

This is a replacement coolant expansion tank with cap for E90-era 3 Series cars. It handles the basic job of holding and venting coolant as the system heats up and cools down, and it makes sense when your original tank is cracked, seeping at the seam, or the level sensor area is starting to sweat. On these cars, a failing tank is common enough that I treat it as part of the usual cooling system age-out list.

If you just need a stock-style replacement on an E90, E91, E92, or E93 328i, 330i, or 335i, this is the straightforward fix. I would pick this over piecing together a used tank and separate cap, especially if your current cap seal is questionable. Just make sure the hose connections and sensor provisions match your specific car before ordering, because BMW changed small details across trims and production years.