Replacement REPB318013 Thermostat Housing Assembly with Sensor OEM# 11537549476

The Replacement REPB318013 Thermostat Housing Assembly is a direct-fit OEM-replacement cooling system component designed for BMW N51, N52, and N54 engines. This assembly includes the thermostat housing and integrated temperature sensor, providing everything needed to restore proper coolant regulation and engine temperature management.

How It Works:

The thermostat housing regulates coolant flow between the engine and radiator. It remains closed during cold starts to allow the engine to reach optimal operating temperature, then opens to route coolant through the radiator once the engine warms up. The integrated sensor monitors coolant temperature and communicates with the vehicle's ECU to maintain precise thermal control. Failure of this component can result in the thermostat sticking open (preventing proper warm-up), sticking closed (causing overheating), or leaking at hose connections or the sensor port.

Key Features:

• Opening Temperature: 97°C (206.6°F) — factory-spec thermal activation point
• Includes integrated temperature sensor port for direct plug-in compatibility
• Direct-fit replacement — no modification required
• Designed to OEM specifications for proper fit and function
• Includes housing and gasket for a complete, leak-free installation
• Compatible with 2.5L and 3.0L inline-6 BMW engines

OEM & Cross-Reference Part Numbers:

• OEM BMW: 11537549476 (also formatted as 11-53-7-549-476)
• Also replaces: 11537544788, 11537536655
• Replacement MPN: REPB318013

Installation Note: New mounting bolts must be used upon installation — existing bolts cannot be reused. Professional installation by a qualified technician is recommended due to the location of the housing near the electric water pump.