FILEMOTO Thermostat Assembly With Housing For BMW E46 E39 X3 X5 - 97°C Aluminum

If your BMW is running cool or your heater isn't getting hot, the thermostat might be stuck open.

This FILEMOTO assembly comes as a complete unit with the housing, making it a straightforward swap.

It opens at 97°C (about 206°F), just like the factory part.

The housing is made from aluminum, which is a nice upgrade over the original plastic that tends to get brittle over time.

It's a direct fit for a bunch of popular BMWs from the early 2000s, including the E46 323i, 325i, 328i, 330i, the E39 525i, 528i, 530i, plus the X5 (3.0i), X3 (3.0i), and Z4.

The kit even includes the gasket, so you've got everything you need to button it back up.

Replaces a ton of OEM numbers like 11531437040 and 11537509227.

Backed by a 1-year warranty.