URO 11531743017 Engine Coolant Thermostat

Engine Coolant Thermostat for BMW Cooling Service

This URO engine coolant thermostat is built for BMW cooling system service with an OE-style housing assembly and factory-matched dimensions for straightforward bolt-on installation. It is a direct replacement for select BMW 318ti, 318i, 318is, and Z3 models, with fitment centered on the 1996-1999 model years.

• OE-style high-flow thermostat design for stable engine cooling performance
• Factory-sized housing for reliable hose connection and easier installation
• Poly housing material helps resist warping and cracking from heat cycling
• Gasket or seal included for service-ready replacement
• Opening temperature: 95 degrees
• Black housing finish
• Inside diameter: 31.3 mm
• Mounting hole diameter: 6.6 mm
• Temperature sensor not included
• MAP controlled: No
• Bleeder screw not included

Detailed Fitment and Application

URO part number 11531743017 is a direct-fit engine coolant thermostat assembly for BMW cooling system repairs where the thermostat housing, seal, and thermostat are serviced together. It is compatible with 1996-1999 BMW 318ti, 1996-1998 BMW 318i, 1996-1998 BMW Z3, and 1996-1997 BMW 318is applications. This part cross-references Febi-Bilstein 33937 and Dorman OE Solutions 902-5118 for the same application.

Common Problems This Part Can Address

• Engine running too cool or too warm due to thermostat wear
• Coolant leakage from a warped or cracked thermostat housing
• Loose or unreliable hose connection at the housing
• Delayed coolant circulation caused by a sticking thermostat
• Cooling system service needs on BMW 318ti, 318i, 318is, and Z3 models

Installation Notes and Tips

Verify engine code and existing housing style before installation, since BMW cooling components can vary by configuration. Replace the thermostat assembly on a cool engine, inspect the mating surfaces, and confirm the gasket or seal seats evenly before refilling and bleeding the cooling system. For BMW 318ti, 318i, 318is, and Z3 service, confirm the hose routing and mounting hole alignment match the original part number 11531743017.

Quality Assurance

URO lists this thermostat housing assembly with guaranteed fitment and a 24 month unlimited mileage warranty. The housing is manufactured to factory dimensions and uses temperature-stable material to help maintain shape under heat exposure.