Gates 33209S Engine Coolant Thermostat

Engine Cooling Thermostat Overview

Gates Premium Thermostat 33209S is an engine coolant thermostat built for temperature control in a wide range of European and domestic applications. It uses stainless steel and copper construction, plus a bottom by-pass design, to support stable coolant regulation at a 195-degree opening temperature.

Compatible With Volvo, Volkswagen, Audi, Porsche, Ford, and other applications listed below, this thermostat is a direct-fit style replacement for vehicles that use the specified OE or alternate temperature setup. The Gates 33209S part number is also referenced by cross applications such as Four Seasons 65379 and Motorad 2034-192.

Key Features

• Premium thermostat design with a 195-degree start-to-open temperature.
• Stainless steel and copper construction for improved corrosion resistance.
• Bottom by-pass configuration for the specified cooling system layout.
• Upgraded spring for more consistent temperature control during normal operation.
• No jiggle pin, check valve, seals, or gasket count listed in the product data.

Detailed Description

The Gates 33209S thermostat is engineered for vehicles that require a 195-degree engine coolant thermostat with a bottom by-pass layout. Its stainless steel and copper construction supports durability in cooling systems exposed to heat and coolant flow, while the upgraded spring helps maintain steadier operating temperature under normal driving conditions. This part number, 33209S, appears across many fitments including Volvo S40, Volvo V70, Volkswagen Golf, and Volkswagen Jetta applications.

Fitment includes 2000-2004 Volvo S40, 1998-2001 Volvo C70, 1985-1999 Volkswagen Golf, 1980-1998 Volkswagen Jetta, and many additional Volvo, Volkswagen, Audi, Porsche, Ford, and related models. Notes vary by application, including OE temperature, alternate temperature, and housing exclusions, so match the listing details carefully before installation. The Gates Premium Thermostat line focuses on temperature stability and corrosion-resistant construction for cooling-system service.

What It Is Used For

• Correcting engine temperature that runs too cool or too warm.
• Restoring proper coolant flow control in a worn thermostat.
• Addressing temperature fluctuation during normal operation.
• Replacing a thermostat that no longer opens at the specified temperature.
• Servicing cooling systems that require a bottom by-pass thermostat design.

Installation Notes and Tips

Verify the vehicle’s required temperature rating, by-pass design, and housing requirements before installation. Some listed applications exclude the housing, and several fitments note OE or alternate temperature specifications. Confirm the cooling system configuration against the catalog listing for the exact Volvo, Volkswagen, Audi, Porsche, Ford, or other application before replacing the thermostat.

Quality Assurance

Gates Premium Thermostats are built with heavy-gauge stainless steel construction and an upgraded spring to support corrosion resistance and stable temperature control. Part number 33209S is cataloged for a broad range of fitments, and the product data identifies it as a premium thermostat for cooling-system service.