Newly upgraded all aluminum thermostat housing, greatly improving quality and service life. Replaces#: 11531437040, 11531436823, 11537509227, 11530139877. Replacement for 1999-2006 BMW 3,5 Series X3 X5 Z3 Z4, more details in the Product Description below. Professional MFG; High quality material; Easy installation.You might be able to fix your problem without visiting your local auto shop, saving both time and money. For any reason, if you are not satisfied with your purchase, please contact us directly. We offer a year's guarantee. Replacement for:

1999-2000 BMW 323i 2.5L
2000 BMW 323Ci 2.5L
2001-2006 BMW 325Ci 2.5L
2001-2005 BMW 325i 2.5L
2001-2005 BMW 325xi 2.5L
2000 BMW 328Ci 2.8L
1999-2000 BMW 328i 2.8L
2001-2006 BMW 330Ci 3.0L
2001-2005 BMW 330i 3.0L
2001-2005 BMW 330xi 3.0L
2001-2005 BMW 525i 2.5L
1999-2000 BMW 528i 2.8L
2001-2005 BMW 530i 3.0L
2004-2005 BMW X3 2.5L
2004-2006 BMW X3 3.0L
1999-2002 BMW Z3 2.5L
1999-2000 BMW Z3 2.8L
2001-2002 BMW Z3 3.0L
2003-2005 BMW Z4 2.5L
2003-2005 BMW Z4 3.0L
2001-2006 BMW X5 3.0L