Coolant Expansion Tank - Replacement for BMW F30

F30

$36.99

Buy on Amazon

Key Features

Replacement expansion tank for BMW F30 applications
Matches OE references 17138677649 and 17138617044
Good fix for cracks, seepage, and low coolant warnings
Stock-style cooling system replacement, not a performance upgrade
Verify part number before ordering - BMW fitment varies
Best replaced before old plastic fails under heat cycles

Product Details

Category: Expansion Tanks
ASIN: B0DX6Q3BZN

Check if it fits your BMW

Coolant Expansion Tank - Replacement for BMW F30 — Overview

This is a replacement coolant expansion tank for F30 3 Series applications using BMW part numbers 17138677649 and 17138617044. If your original tank is yellowed, cracked around the seams, or starting to seep at the hose connections, this is the part you replace before it leaves you stranded with a low coolant warning. On these cars, the plastic tank is a known wear item once heat cycles and age start catching up.

I’d pick this when you need a straightforward stock-style replacement and your fitment matches those OE references. It makes more sense than trying to reuse a brittle original tank during a cooling system refresh, especially if you’re already in there doing hoses or checking for leaks. Just confirm the part number against your car first, because BMW fitment around cooling components can get annoyingly specific even within the same chassis.