Motorad 661-176 Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen Cooling Systems

The Motorad Standard 661-176 engine coolant thermostat is built for Volkswagen cooling systems that require a 176°F opening temperature. It uses OEM-quality materials and OE-supplier manufacturing processes to deliver consistent coolant flow control for Volkswagen Beetle, Jetta, Passat, Golf, Golf SportWagen, and Bora applications.

Motorad Standard focuses on direct-fit thermostat service parts with OE-style sealing details. The 661-176 includes a copper case, wax compound, offset design, air relief valve, and OEM-style seals where applicable for a service-ready replacement.

Key Features

• Start-to-open temperature: 176°F
• Standard thermostat design for OE-specified cooling control
• Copper case and wax compound for quick response to coolant temperature changes
• Jiggle pin weep hole for air relief
• O-ring seal type with rubber seals included
• Sealing flange outside diameter: 2.63 in
• Height: 1.86 in; height between flanges: 1.3 in
• Flange thickness: 0.05 in

Detailed Description

Motorad part number 661-176 is an engine coolant thermostat engineered to maintain the correct operating temperature in Volkswagen cooling systems. The 176°F opening point matches OE-specified temperature requirements for many Volkswagen Jetta, Beetle, Passat, Golf, Golf SportWagen, and Bora applications, helping the engine reach and hold its intended thermal range. This thermostat uses a copper case and wax compound for responsive temperature control, along with an offset design and air relief valve to support proper coolant circulation and bleeding during service.

This part cross-references Four Seasons 56617 and 66176 for the same application.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuations caused by a worn thermostat
• Coolant flow control issues in OE-specified 176°F applications
• Air trapped in the cooling system after thermostat service
• Sealing concerns at the thermostat housing interface

Installation Notes and Tips

• Verify the OE-specified 176°F temperature before installation.
• Inspect the sealing surfaces and replace damaged housing components as needed.
• Use the included O-ring seals and confirm proper seating before refilling coolant.
• Bleed the cooling system carefully to remove trapped air after service.
• Confirm vehicle application by year, make, and model before ordering.

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 thermal control in demanding automotive cooling systems.

Compatible with select Volkswagen applications including 2005-2018 Jetta, 2006-2014 Beetle, 2010-2014 Golf, 2012-2014 Passat, 2010-2013 Golf SportWagen, 2010-2011 Beetle Cabrio, and 2005-2010 Bora. Motorad 661-176 is a direct replacement choice for OE-style thermostat service.