Rein C2Z19929 Engine Coolant Thermostat Assembly with Housing

The Rein C2Z19929 is an OE-quality engine coolant thermostat assembly engineered for Jaguar and Land Rover vehicles equipped with 3.0L V6 and 5.0L V8 engines. This kit includes the thermostat and thermostat housing, making it a complete, ready-to-install cooling system solution.

The engine thermostat is a critical component of the cooling system. It regulates coolant flow between the engine and radiator to maintain optimal operating temperature. When the engine is cold, the thermostat remains closed, allowing coolant to circulate within the engine until it reaches operating temperature. Once the engine reaches its thermal threshold, the thermostat opens to route coolant through the radiator, where it is cooled before returning to the engine.

Rein's upgraded metal construction addresses a well-known weakness in these platforms — the factory-installed plastic thermostat housings are prone to cracking and warping under the heat and pressure demands of these high-performance engines. This assembly replaces the failure-prone plastic OE component with a direct-fit metal alternative for improved durability, heat resistance, and long-term service life.

Key Features:

• Complete kit — includes thermostat and thermostat housing
• Upgraded metal housing construction replaces failure-prone OE plastic
• Direct-fit design for straightforward installation
• Temperature-calibrated for precise, consistent coolant regulation
• Manufactured to meet or exceed OE specifications
• Compatible with naturally aspirated 5.0L V8 applications
• OEM Reference: C2Z19929

Rein Automotive is a brand of CRP Automotive, a company with decades of experience supplying OE-quality replacement parts for European import vehicles. Replacing a failed or failing thermostat assembly is also recommended whenever any cooling system overheating event occurs, as excessive heat can damage the thermostat even if it isn't the root cause of the failure.