Motorad 733-189 Engine Coolant Thermostat

Motorad 733-189 Engine Coolant Thermostat

Motorad 733-189 is a standard engine coolant thermostat built to OE specifications for precise temperature control in demanding cooling systems. It uses a copper case and wax compound for quick reaction to coolant temperature changes, and it includes an O-ring seal for a direct replacement service part.

Compatible with select Volkswagen Atlas, Atlas Cross Sport, Passat, Touareg, CC, Passat CC, Teramont, and Porsche Cayenne applications, this thermostat is specified at 189 degrees F for vehicles that require that opening temperature. The Motorad Standard line focuses on OE-style fit and function for routine cooling system service.

Key Features

• Engine coolant thermostat with 189°F start-to-open temperature
• Standard Motorad line replacement built to OEM specifications and processes
• Copper case and wax compound for responsive temperature regulation
• Includes one rubber O-ring seal
• Offset design with air relief valve and OEM-style seals where applicable
• Sealing flange outside diameter: 1.64 in
• Height between flanges: 1.87 in
• Overall height: 2.67 in

Detailed Description

Motorad 733-189 is an OE-style engine coolant thermostat engineered to maintain proper operating temperature in modern cooling systems. The 189°F calibration matches applications that call for this opening point, helping the engine reach and hold the intended thermal range. Its copper case and wax element are selected for fast response as coolant temperature rises and falls, while the offset design and air relief valve support proper system operation during service.

This part cross-references Stant 15489 and Four Seasons 57338 for the same application. It is a direct-fit service option for 2010-2023 Volkswagen and Porsche applications listed below, including Volkswagen Passat, Touareg, CC, Atlas, Atlas Cross Sport, and Porsche Cayenne. Part number 733-189 is also listed under OE-style interchange references for select vehicles.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed warm-up after cold starts
• Temperature fluctuation from a sticking thermostat
• Cooling system service on OE-specified 189°F applications
• Replacement of a thermostat with a leaking or hardened seal

Installation Notes and Tips

• Verify the OE-specified opening temperature before installation.
• Inspect the thermostat housing and sealing surfaces for corrosion or debris.
• Replace coolant as required by the service procedure after thermostat replacement.
• Confirm the O-ring seal is seated correctly before closing the housing.
• Bleed air from the cooling system to reduce trapped-air issues after service.

Quality Assurance

Motorad manufactures this thermostat with OEM-quality materials and safety standards as an OE supplier. The Standard product line is built to match OEM specifications for fit, temperature control, and service reliability in demanding automotive cooling systems.

• Fits 2022-2023 Volkswagen Atlas, N/A
• Fits 2021-2023 Volkswagen Atlas Cross Sport, N/A
• Fits 2018-2021 Volkswagen Atlas, N/A
• Fits 2020 Volkswagen Atlas Cross Sport, N/A
• Fits 2019 Volkswagen Teramont, N/A
• Fits 2016-2018 Porsche Cayenne, N/A
• Fits 2011-2014 Porsche Cayenne, N/A
• Fits 2012-2018 Volkswagen Passat, N/A
• Fits 2017 Volkswagen CC, N/A
• Fits 2011-2012 Volkswagen CC, N/A
• Fits 2011-2017 Volkswagen Touareg, N/A
• Fits 2016 Volkswagen CC, N/A
• Fits 2013-2014 Volkswagen CC, N/A
• Fits 2015 Volkswagen CC, N/A
• Fits 2011-2012 Volkswagen Passat CC, N/A
• Fits 2010 Volkswagen Passat CC, N/A