BMW Aluminum Thermostat Housing Upgrade Replacement – Improved Cooling System Reliability – E46 E39 E60 E61 E38 E65 E66 X3 X5 Z3 Z4 | Replaces Part No. 11521712058

Upgrade your BMW’s cooling system with this aluminum thermostat housing replacement, designed to improve reliability over the factory-style plastic housing. The thermostat housing plays a critical role in sealing the thermostat connection and helping regulate coolant flow through the engine.

Over time, factory plastic thermostat housings can become brittle from repeated heat cycles, coolant pressure, and age. Once weakened, the housing may crack, warp, or leak, leading to coolant loss, overheating, low coolant warnings, and potential engine damage. This aluminum replacement provides a stronger, more durable solution for long-term cooling system dependability.

This upgrade is ideal for preventative maintenance, cooling system refreshes, or replacing a cracked, leaking, or aging thermostat housing on compatible BMW models.

Key Features:

• Aluminum thermostat housing upgrade replacement
• Improved durability over factory-style plastic housings
• Helps restore a secure thermostat seal
• Supports proper coolant flow and temperature regulation
• Helps prevent coolant leaks, overheating, and cooling system pressure loss
• Ideal for cooling system repairs and preventative maintenance
• Designed for compatible BMW E46, E39, E60, E61, E38, E65, E66, X3, X5, Z3, and Z4 models

FITMENT: BMW 3 Series / 5 Series / 7 Series / X5 / Z3

• BMW 3 Series – E36
  Production Date: 11/1989-10/1999
• BMW 3 Series – E46
  Production Date: 04/1997-08/2006
• BMW 5 Series – E34
  Production Date: 03/1987-06/1996
• BMW 5 Series – E39
  Production Date: 02/1995-12/2003
• BMW 7 Series – E32
  Production Date: 10/1985-03/1994
• BMW 7 Series – E38
  Production Date: 03/1995-07/2001
• BMW X5 – E53
  Production Date: 08/1999-09/2006
• BMW Z3 – E36
  Production Date: 04/1996-06/2002

Please verify your original part number before ordering to confirm compatibility.

Replaces Part No. 11521712058

Please refer to the “Fitment” section in the product description for compatibility details.