HomeBelts and Cooling > Thermostat and HousingRein CTA0033 Engine Coolant Thermostat Housing Assembly
Part #: CTA0033

Rein CTA0033 Engine Coolant Thermostat Housing Assembly

⚙️ 80 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: BMW, Z4, 128i, 328i, 328i xDrive, 335is, 1 Series M, 323i, 135i, 335i, 335i xDrive, 528i, 528i xDrive, 535i, 535i xDrive, X3, 328xi, 335xi, 528xi, 535xi, 525i, 525xi, 530i, 530xi, 325i, 325xi, 330i, and 330xi
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Overview of Rein Engine Coolant Thermostat Housing Assembly

The Rein CTA0033 thermostat housing assembly is engineered to meet original equipment specifications, ensuring reliable performance for BMW vehicles. Designed for direct fitment, this thermostat assembly simplifies replacement for various BMW 1 Series, 3 Series, 5 Series, X3, and Z4 models.

  • Matches original equipment design specifications for precise fit
  • Direct fitment allows for straightforward installation
  • Manufactured to strict engineering standards in China
  • Thermostat set to 97 degrees Celsius to maintain optimal engine temperature
  • Compact dimensions: 7" length, 5" width, 4" height, weighing 1.085 lbs

Detailed Product Description

The Rein CTA0033 engine coolant thermostat housing assembly is a vehicle-specific replacement part designed to maintain proper engine temperature by regulating coolant flow. This assembly is tailored for BMW models including the 1 Series M, 128i, 135i, 323i, 325i, 328i, 330i, 335i, 525i, 528i, 530i, 535i, X3, and Z4. The thermostat is calibrated to open at 97 degrees Celsius, ensuring the engine runs within optimal temperature ranges to prevent overheating or inefficient operation. Manufactured under strict quality controls, this assembly meets or exceeds OEM standards, providing a reliable and durable solution for engine cooling system maintenance.

Compatible BMW Models and Common Applications

  • BMW 1 Series M, 128i, 135i
  • BMW 3 Series: 323i, 325i, 325xi, 328i, 328i xDrive, 328xi, 330i, 330xi, 335i, 335is, 335i xDrive, 335xi
  • BMW 5 Series: 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 535i, 535i xDrive, 535xi
  • BMW X3 and Z4 models

Common Issues Addressed by This Thermostat Assembly

  • Engine overheating due to thermostat failure
  • Erratic engine temperature fluctuations
  • Coolant leaks from damaged or worn thermostat housing
  • Poor engine performance caused by improper coolant flow
  • Check engine light triggered by cooling system faults

Installation Notes and Tips

The Rein CTA0033 thermostat housing assembly is designed for direct replacement of the original part, allowing for an easier installation process without modification. Note that installation hardware and instructions are not included, so it is recommended to have appropriate tools and reference a vehicle-specific repair manual. Ensure the engine is cool before beginning installation to avoid injury. Properly torque all fasteners to manufacturer specifications to prevent leaks.

Quality Assurance and Warranty

Rein thermostat assemblies are manufactured to meet strict engineering standards, ensuring durability and performance. This product includes a 24,000-mile warranty, providing coverage against defects in materials and workmanship. The assembly is made in China under controlled conditions to maintain consistent quality.

BrandRein
Part NumberCTA0033
Application TypeApplicationSpecific
Container TypeBX
Country of OriginCN
Installation Instructions IncludedNo
Is the Installation Hardware IncludedNo
Item Height4.0000
Item Length7.0000
Item Level GTIN888544068423
Item Qty1
Item UOMEA
Item Weight1.0850
Item Weight Unit UOMLB
Item Width5.0000
Link to Manufacturer Pagewww.reinautomotive.com
Product Desc Extended 240Rein OE Quality thermostat assemblies are designed to be direct replacements for OE assemblies. Rein thermostat assemblies are manufactured with high-quality plastic or metal construction to ensure durability and long service life.
Product Desc Invoice 40Rein Thermostat Assembly
Product Desc Long 80Rein OE Quality Thermostat Assembly
Product Desc Short 20Thermostat Assembly
Warranty Distance24000

This part fits 80 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2016BMWZ43.0LL6N/A
2015BMWZ43.0LL6N/A
2014BMWZ43.0LL6N/A
2013BMW128i3.0LL6N/A
2013BMW328i3.0LL6N/A
2013BMW328i xDrive3.0LL6N/A
2013BMW335is3.0LL6N/A
2013BMWZ43.0LL6N/A
2012BMW128i3.0LL6N/A
2012BMW328i3.0LL6N/A
2012BMW328i xDrive3.0LL6N/A
2012BMW335is3.0LL6N/A
2012BMWZ43.0LL6N/A
2011BMW1 Series M3.0LL6N/A
2011BMW128i3.0LL6N/A
2011BMW323i2.5LL6N/A
2011BMW328i3.0LL6N/A
2011BMW328i xDrive3.0LL6N/A
2011BMW335is3.0LL6N/A
2011BMWZ43.0LL6N/A
2010BMW128i3.0LL6N/A
2010BMW135i3.0LL6N/A
2010BMW323i2.5LL6N/A
2010BMW328i3.0LL6N/A
2010BMW328i xDrive3.0LL6N/A
2010BMW335i3.0LL6N/A
2010BMW335i xDrive3.0LL6N/A
2010BMW528i3.0LL6N/A
2010BMW528i xDrive3.0LL6N/A
2010BMW535i3.0LL6N/A
2010BMW535i xDrive3.0LL6N/A
2010BMWX33.0LL6N/A
2010BMWZ43.0LL6N/A
2009BMW128i3.0LL6N/A
2009BMW135i3.0LL6N/A
2009BMW323i2.5LL6N/A
2009BMW328i3.0LL6N/A
2009BMW328i xDrive3.0LL6N/A
2009BMW335i3.0LL6N/A
2009BMW335i xDrive3.0LL6N/A
2009BMW528i3.0LL6N/A
2009BMW528i xDrive3.0LL6N/A
2009BMW535i3.0LL6N/A
2009BMW535i xDrive3.0LL6N/A
2009BMWX33.0LL6N/A
2009BMWZ43.0LL6N/A
2008BMW128i3.0LL6N/A
2008BMW135i3.0LL6N/A
2008BMW323i2.5LL6N/A
2008BMW328i3.0LL6N/A
2008BMW328xi3.0LL6N/A
2008BMW335i3.0LL6N/A
2008BMW335xi3.0LL6N/A
2008BMW528i3.0LL6N/A
2008BMW528xi3.0LL6N/A
2008BMW535i3.0LL6N/A
2008BMW535xi3.0LL6N/A
2008BMWX33.0LL6N/A
2008BMWZ43.0LL6N/A
2007BMW323i2.5LL6N/A
2007BMW328i3.0LL6N/A
2007BMW328xi3.0LL6N/A
2007BMW335i3.0LL6N/A
2007BMW335xi3.0LL6N/A
2007BMW525i3.0LL6N/A
2007BMW525xi3.0LL6N/A
2007BMW530i3.0LL6N/A
2007BMW530xi3.0LL6N/A
2007BMWX33.0LL6N/A
2007BMWZ43.0LL6N/A
2006BMW323i2.5LL6N/A
2006BMW325i3.0LL6N/A
2006BMW325xi3.0LL6N/A
2006BMW330i3.0LL6N/A
2006BMW330xi3.0LL6N/A
2006BMW525i3.0LL6N/A
2006BMW525xi3.0LL6N/A
2006BMW530i3.0LL6N/A
2006BMW530xi3.0LL6N/A
2006BMWZ43.0LL6N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.