Engine Coolant Thermostat and Housing Assembly Compatible with Mini

Our review of this thermostat and housing assembly finds it best suited to DIY mechanics and independent shops working on Mini Cooper models from 2007 through early 2013. The single biggest reason to consider it is the complete replacement approach: the assembly ships with the thermostat, two temperature sensors, mounting hardware and an O-ring so installers replace all wear items at once. Fitment is specific to several N12/N14/N16 engine designations and some earlier cars may need the original harness (12517646145), so this is a targeted, parts-complete option rather than a universal fix.

Key Features

• Complete assembly: Ships with thermostat, two 2-pin temperature sensors and the thermostat housing, reducing parts hunting and simplifying installation for the correct Mini models.
• OEM reference compatibility: Fits reference numbers such as 11537534521 and 11538699290, helping buyers cross-reference with their factory part numbers.
• Hardware included: Bolts, clips and an O-ring are included so installers get a full seal kit and mounting hardware for a single service job.
• Thermostat opening temp: The thermostat opens at 221 Deg. F, which is a concrete operating benchmark to match the vehicle thermal characteristics.
• Designed fitment: Specific engine designations (N12, N14, N16 series) and model years are listed, so mechanics can confirm fit before purchase.

Who It's For

This assembly is aimed at owners of Mini Cooper and Cooper Countryman models made between 2007 and 2013 with the specified N12/N14/N16 engines, and for technicians who prefer to replace the thermostat and housing together. It is also useful for anyone who wants the convenience of included sensors and hardware so the whole cooling junction is refreshed in one service.

It is not ideal for someone who cannot confirm their engine designation or production date, as early-built cars may require the original harness 12517646145 for sensor connectors. Buyers seeking a long-term OEM warranty or dealership fitment validation should check compatibility before ordering.

Pros & Cons

Pros

• Comes as a full replacement assembly with sensors and mounting hardware, which saves time during installation.
• Clear compatibility guidance with engine designations and reference numbers helps ensure a correct match.
• Thermostat opening temperature of 221 Deg. F gives a predictable thermal behavior for cooling system tuning.

Cons

• Installation reports are mixed; some buyers have reported early failures and leakage, so careful inspection and proper sealing are important.
• Some vehicles built before 3/2012 may require the original harness to fit the included sensors, adding an additional parts requirement.

Specifications

Our Verdict

This thermostat housing assembly is a practical, cost-effective option for Mini Cooper and Countryman owners who need a full replacement with sensors and hardware. It delivers good value when compatibility is confirmed and installers take care to seal fittings properly. Those who cannot verify engine designation or who prefer OEM dealer parts may want to check harness requirements before purchasing.

Frequently Asked Questions

Will this fit my Mini Cooper?
Check the engine designation (N12/N14/N16 series) and model year; some cars built before 3/2012 may also need the original harness 12517646145.

Are the temperature sensors included?
Yes, the assembly includes a 2-pin temperature sensor and a 2-pin thermostat housing sensor as part of the kit.

Does it include mounting hardware?
Yes, bolts, clips and an O-ring are included so installers receive a full kit for the replacement.