MAHLE TH 78 90 Engine Coolant Thermostat Assembly with Gasket

The MAHLE TH 78 90 is a precision-engineered engine coolant thermostat assembly designed to maintain optimal engine operating temperatures. Produced under the trusted MAHLE Behr Thermot-tronik brand, this thermostat assembly is a direct-fit replacement that meets or exceeds original equipment specifications.

Key Features:

• Opening Temperature: 90°C (194°F) — engineered for precise thermal regulation
• Includes gasket/seal for a complete, leak-free installation
• Built to OE standards by MAHLE, one of the world's largest thermal management suppliers
• Wax-element expansion design provides reliable, maintenance-free operation
• Replaces Volvo OEM part numbers 31293767 and 31686046
• Cross-references: CALORSTAT by Vernet TH741690J

The thermostat regulates coolant flow to keep the engine within its ideal temperature range, reducing wear, improving fuel efficiency, and minimizing harmful emissions. A failed thermostat can cause overheating, temperature fluctuations, poor performance, and increased fuel consumption — making timely replacement critical to engine health.

OEM / Cross-Reference Part Numbers: Volvo 31293767, Volvo 31686046, CALORSTAT TH741690J, BEH TH 78 90