Heater Inlet Coolant Pipe – BMW 3-Series 5-Series X3 X5 Z3 Z4 (11531705210)

This high-quality TOPRAN coolant pipe (engine side water pipe) is a direct replacement for Genuine Part Number Reference: 11531705210. It carries heated coolant from the engine block to the heater core, supplying cabin heat. This is the companion pipe to the coolant return pipe (11537502525) and is often replaced at the same time. The plastic is known to become brittle and crack with age under the intake manifold's heat, which is a common cause of coolant leaks, low coolant warnings, and loss of cabin heat.

Key Features:

Direct replacement for OEM part number 11531705210
Manufactured to meet or exceed OEM specifications
Durable plastic construction
Factory-style fit and function
Also known as heater inlet pipe, coolant pipe, water pipe, engine coolant line

Compatible With:

BMW 3-Series (E36) – 1995 to 1999
BMW 3-Series (E46) – 1998 to 2006
BMW 5-Series (E39) – 1995 to 2003
BMW X3 (E83) – 2004 to 2006
BMW X5 (E53) – 2001 to 2006
BMW Z3 – 1995 to 2002
BMW Z4 (E85) – 2002 to 2008
320i, 320Ci, 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330Ci, 330xi, 520i, 525i, 528i, 530i, X3 2.5i, X3 3.0i, X5 3.0i, Z3 2.3, Z3 2.5i, Z3 2.8, Z3 3.0i, Z4 2.5i, Z4 3.0i

Engine Codes:
M52B20, M52B25, M52B28, M54B22, M54B25, M54B30

Year Range:
1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008

This is an aftermarket replacement part, not a genuine BMW component.