Motorad 707-203 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Motorad Standard 707-203 engine coolant thermostat is built for precise temperature control in Volkswagen and Audi cooling systems. It uses OEM-quality materials and OE-spec manufacturing processes to deliver consistent coolant regulation at a 203°F opening temperature.

Compatible With Audi A3, A4, A5, A6, Q3, Q5, TT Quattro, allroad, A4 allroad, A4 Quattro, A5 Quattro, A6 Quattro, Q3 Quattro, Q5, and Volkswagen Amarok, Beetle, CC, Eos, GTI, Jetta, Passat, Passat CC, Tiguan, Tiguan Limited, and related applications.

• Motorad Standard line thermostat for OE-style replacement service
• Start-to-open temperature: 203°F for factory-specified cooling control
• Copper case and wax compound for fast response to coolant temperature changes
• Offset design with air relief valve where applicable
• Includes gasket/seal with rubber O-ring sealing design
• OE supplier manufacturing with OEM specifications and processes

Detailed Product Overview

Part number 707-203 is an engine coolant thermostat designed for vehicles that require a 203°F thermostat insert and seal. The Motorad Standard line focuses on direct-fit service parts that follow OE dimensions and sealing requirements, including a sealing flange outside diameter of 1.77 inches, height of 2.28 inches, and height between flanges of 1.6 inches. This thermostat is listed with one rubber seal and no jiggle pin weep hole.

This part cross-references Bosch 15462 and Dorman 57073 for the same application. It is a direct replacement choice for many Audi A4, A5, Q5, and Volkswagen Tiguan and GTI cooling system repairs where OE-specified temperature control is required. The 707-203 part number also appears in interchange listings for related aftermarket and OE-reference searches.

What This Thermostat Helps Address

• Engine running too cool or too warm
• Slow warm-up after cold starts
• Temperature fluctuation in the coolant circuit
• Cooling system service on Audi and Volkswagen models with 203°F specification
• Thermostat housing maintenance where the insert and seal are replaced together

Installation Notes and Tips

Verify the OE temperature specification and housing style before installation. This thermostat is listed for applications that use an insert-and-seal design, and some fitments note INZI back housing or OE-specified housing requirements. Replace the seal during service, clean the sealing surfaces thoroughly, and confirm proper coolant fill and air bleeding after installation.

Quality Assurance

Motorad manufactures this thermostat with OEM-quality materials and safety standards as an OE supplier. It is produced to OEM specifications and processes for dependable fit and temperature control in demanding cooling systems.