Calorstat 271664/71 Engine Coolant Thermostat

The Calorstat 271664/71 is a precision-engineered engine coolant thermostat designed to regulate engine operating temperature at 71°C (160°F). Manufactured by Calorstat by Vernet in France, this thermostat ensures optimal engine performance by maintaining proper coolant flow and temperature control.

Key Features:

• Opening temperature: 71°C (160°F) for precise temperature regulation
• Constructed from durable metal and copper materials for long-lasting reliability
• Includes jiggle pin check valve for proper air bleeding during installation
• Comes with rubber O-ring seal for leak-free operation
• Bypass valve diameter: 35mm, sealing flange diameter: 2.12 inches
• Height between flanges: 1.2 inches for proper fitment
• OE replacement part meeting specifications for fit, form, and function

This thermostat insert is sold without the housing and supersedes Volvo part number 271417. The integrated jiggle pin weep hole allows trapped air to escape during cooling system filling, preventing air pockets that could cause overheating. Proper thermostat operation is critical for maintaining fuel efficiency, reducing emissions, and preventing engine damage from overheating or overcooling.