Rein CTN0070 Engine Coolant Thermostat

OE-Quality Thermostat Insert for Mercedes-Benz Cooling Systems

The Rein CTN0070 engine coolant thermostat is an OE-quality insert built for precise temperature control in Mercedes-Benz cooling systems. It features an 87°C start-to-open calibration, a silver finish, and an included gasket or seal for a cleaner service replacement.

Fits 1985-1999 Mercedes-Benz 190E, 260E, 300CE, 300E, 300SE, 300SL, 300TE, 300SEL, S320, C280, C36 AMG, E320, and SL320 applications across the listed model years.

• 87°C start-to-open temperature for consistent coolant flow control
• Gasket or seal included for service replacement
• OE-quality thermostat insert construction
• High-quality metal and component materials for durability
• Direct-fit design for Mercedes-Benz cooling system service
• Part number: CTN0070

Detailed Product Overview

Rein CTN0070 is engineered as a thermostat insert for Mercedes-Benz engines that require accurate coolant temperature regulation. The thermostat is temperature calibrated for a precise response, helping the cooling system maintain the operating range expected by the vehicle manufacturer. Rein builds these inserts with OE-quality materials and components to support proper fit, dependable operation, and service life. This part cross-references Mercedes-Benz 1102000515 for the same application.

Common Cooling System Issues Addressed

• Engine running too cool or too warm
• Delayed coolant circulation after cold start
• Temperature fluctuation during normal driving
• Cooling system service on aging Mercedes-Benz models
• Replacement of a worn thermostat insert during maintenance

Installation Notes and Tips

Install the thermostat insert in the correct housing orientation and replace the seal during service. Clean the mating surfaces before assembly and refill the cooling system with the proper coolant mixture after installation. Verify the cooling system is fully bled of air and confirm normal operating temperature after the repair.

Quality Assurance

Rein positions this thermostat insert as an OE-quality replacement built to meet or exceed the materials used in the original component. The calibrated opening temperature and included seal support accurate installation and consistent cooling-system performance on Mercedes-Benz 190E, 300E, and related applications. Part number CTN0070 is manufactured for professional repair use and long-term serviceability.