Vemo V20-99-1258-1 Engine Coolant Thermostat Kit

Engine Cooling Control for BMW Applications

The Vemo V20-99-1258-1 engine coolant thermostat kit is built for BMW cooling system service where precise temperature control matters. It opens at 97°C and includes a sensor and seal for a direct-fit repair on supported BMW 3 Series, 5 Series, X3, X5, Z3, and Z4 applications.

VEMO product line parts are developed for European vehicle repair needs, with attention to fit, electrical connection, and cooling-system sealing details. This thermostat kit is a practical choice when replacing a worn thermostat housing assembly on BMW models that require a 2-pole sensor connection.

• Engine coolant thermostat kit with housing, thermostat, seal, and sensor
• Opening temperature: 97°C for controlled coolant flow
• 2-pole sensor connection
• Dimensions: 194 mm length, 115 mm width, 98 mm height
• Direct replacement reference: V20-99-1258-1
• Cross-reference: Febi-Bilstein 47197

Detailed Product Information

This thermostat kit is designed for BMW cooling systems that use a 97°C thermostat specification and a sensor-equipped housing. It supports temperature regulation by helping the engine reach operating temperature and maintain stable coolant circulation under normal driving conditions. The V20-99-1258-1 part number is also useful when cross-checking catalog listings for BMW 325Ci, 330Ci, X3, X5, 325i, 330i, 525i, 530i, Z4, and Z3 coverage.

Compatible With: Fits 2001-2006 BMW 325Ci, N/A; Fits 2001-2006 BMW 330Ci, N/A; Fits 2004-2006 BMW X3, N/A; Fits 2001-2006 BMW X5, N/A; Fits 2001-2005 BMW 325i, N/A; Fits 2001-2005 BMW 325xi, N/A; Fits 2001-2005 BMW 330i, N/A; Fits 2001-2005 BMW 330xi, N/A; Fits 2001-2005 BMW 525i, N/A; Fits 2001-2005 BMW 530i, N/A; Fits 2003-2005 BMW Z4, N/A; Fits 1999-2002 BMW Z3, N/A; Fits 2000 BMW 323Ci, N/A; Fits 1999-2000 BMW 323i, N/A; Fits 2000 BMW 328Ci, N/A; Fits 1999-2000 BMW 328i, N/A; Fits 1999-2000 BMW 528i, N/A.

Common Cooling Issues It Can Address

• Engine running too cool or too hot due to thermostat wear
• Coolant leaks at the thermostat housing seal area
• Temperature sensor faults tied to the thermostat assembly
• Slow warm-up or unstable operating temperature
• Cooling system service on BMW models with a 97°C thermostat spec

Installation Notes and Tips

Before installation, confirm the part number V20-99-1258-1 against the original thermostat housing and sensor connector style. Inspect the mating surfaces carefully and clean the cooling system sealing area before assembly. After installation, refill and bleed the cooling system according to BMW service procedures to remove trapped air and verify stable operating temperature.

Quality Assurance

This VEMO thermostat kit is built as an aftermarket replacement for the listed BMW applications and includes the sensor and seal specified in the product data. The 2-pole design and 97°C opening temperature support accurate catalog matching for cooling-system repair.