Motorad 304-180 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Motorad Standard 304-180 engine coolant thermostat is built for precise temperature control in demanding cooling systems. It opens at 180 degrees F and uses OEM-quality materials to support stable coolant flow in a wide range of Audi, Volkswagen, Porsche, BMW, and Dodge applications.

Motorad’s Standard line focuses on OE-style replacement parts made to factory specifications. The 304-180 follows that approach with a copper case, wax compound for quick temperature response, an offset design, and an air relief valve where applicable.

Key Features

• 180 degree F start-to-open temperature for factory-style engine cooling control
• Copper case and wax compound for responsive temperature changes
• Offset design with air relief valve and OEM-style seals where applicable
• Jiggle pin weep hole included for air bleeding during service
• Standard type thermostat for direct replacement use
• Motorad 304-180 engineered to OEM specifications and processes

Detailed Description

This Motorad thermostat is intended for drivers and technicians replacing a worn or sticking engine coolant thermostat in import and domestic vehicles. The 304-180 is a 180F unit with a sealing flange outside diameter of 2.64 inches, a height of 1.95 inches, and a bypass diameter of 1.37 inches. Its copper case construction and wax element are selected to react quickly as coolant temperature changes, helping maintain consistent operating temperature.

Compatible With 2004-2006 Audi A8 Quattro, N/A; 2007-2009 Audi S6, N/A; 2004-2007 Volkswagen Touareg, N/A; and 2004-2006 Porsche Cayenne, N/A. It also cross-references Bosch 13640 for the same application. Additional vehicle coverage includes Audi A4, A6, A8, TT Quattro, RS6, S4, S8, Volkswagen Golf, Jetta, Passat, EuroVan, R32, Phaeton, Eos, BMW 318i, 318is, 318ti, 528i, 525iT, and Dodge Monaco applications listed in the fitment data.

What It Helps Address

• Engine running hotter than normal due to a thermostat that is stuck closed
• Slow warm-up or unstable operating temperature from a worn thermostat
• Coolant flow issues caused by poor thermostat response
• Air trapped in the cooling system during thermostat service
• Replacement needs for OE-style 180F thermostat applications

Installation Notes and Tips

Install the thermostat in the correct orientation and verify the bypass and sealing surfaces are clean before assembly. The jiggle pin weep hole helps with air relief, so position it according to the vehicle’s service procedure. This part does not include a gasket or seal, and no installation tool is included.

Quality Assurance

Motorad manufactures this Standard thermostat using OEM-quality materials and safety standards as an OE supplier. It is produced to OEM specifications and processes for consistent fit and temperature control in the listed applications.