Rein CTA0033 Engine Coolant Thermostat Housing Assembly

OE-Style Thermostat Housing for BMW Cooling Systems

Rein CTA0033 is an engine coolant thermostat housing assembly built for BMW cooling system service where direct fit and stable temperature control matter. It is engineered to match original equipment design specifications and is calibrated to open at 97 degrees Celsius for consistent operating temperature.

Compatible with select BMW 1 Series, 3 Series, 5 Series, X3, and Z4 applications, this Rein thermostat assembly is a practical OE-quality replacement for vehicles that need accurate cooling system regulation and a clean factory-style installation.

Key Features

• Matches original equipment design specifications
• Direct-fit construction for easier installation
• Built to strict engineering standards for materials and tolerances
• Thermostat calibrated to 97 degrees Celsius
• Constructed with vehicle-specific metal or plastic housing design
• OE-style replacement for BMW cooling system service

Detailed Description

Rein CTA0033 thermostat housing assembly is manufactured as an OE-quality replacement using molds cast from OEM parts to help maintain factory dimensions and fit. The housing design follows vehicle-specific requirements, while the thermostat uses quality metals and components for durability and service life. This part cross-references BMW 11537536655 and 11537544788 for the same application.

Fits 2006-2016 BMW Z4, N/A. Fits 2008-2013 BMW 128i, N/A. Fits 2007-2013 BMW 328i, N/A. Fits 2009-2013 BMW 328i xDrive, N/A. Fits 2011-2013 BMW 335is, N/A. Fits 2011 BMW 1 Series M, N/A. Fits 2006-2011 BMW 323i, N/A. Fits 2008-2010 BMW 135i, N/A. Fits 2007-2010 BMW 335i, N/A. Fits 2009-2010 BMW 335i xDrive, N/A. Fits 2008-2010 BMW 528i, N/A. Fits 2009-2010 BMW 528i xDrive, N/A. Fits 2008-2010 BMW 535i, N/A. Fits 2009-2010 BMW 535i xDrive, N/A. Fits 2007-2010 BMW X3, N/A. Fits 2007-2008 BMW 328xi, N/A. Fits 2007-2008 BMW 335xi, N/A. Fits 2008 BMW 528xi, N/A. Fits 2008 BMW 535xi, N/A. Fits 2006-2007 BMW 525i, N/A. Fits 2006-2007 BMW 525xi, N/A. Fits 2006-2007 BMW 530i, N/A. Fits 2006-2007 BMW 530xi, N/A. Fits 2006 BMW 325i, N/A. Fits 2006 BMW 325xi, N/A. Fits 2006 BMW 330i, N/A. Fits 2006 BMW 330xi, N/A.

Common Issues This Part Can Address

• Coolant temperature regulation problems
• Cracked or leaking thermostat housing
• Sticking thermostat causing unstable engine temperature
• Cooling system service on BMW models with OE-style housing requirements
• Fitment issues from worn or distorted original housing components

Installation Notes and Tips

Verify engine code and OE part number before installation to confirm application match for your BMW 328i, 335i, X3, or Z4. Inspect the cooling system for contamination, hose condition, and sealing surfaces before fitting the new assembly. Because installation hardware and instructions are not included, transfer or source any required related components separately as needed for the repair.

Quality Assurance

Rein designs this thermostat housing assembly to meet or exceed OE material expectations and factory tolerances. The part number is CTA0033, and it carries a 24,000-mile warranty distance.