Motorad 390-195 Engine Coolant Thermostat

Engine Coolant Thermostat for Volvo Cooling Systems

Motorad Standard 390-195 is a 195°F engine coolant thermostat built to OE specifications for steady coolant control in demanding cooling systems. It is a direct-fit thermostat for select Volvo S80 and Volvo XC90 applications, with OEM-style sealing components and an offset design for proper installation.

The Motorad Standard line focuses on OE-style replacement parts made with OEM quality materials and processes. For Volvo S80 and Volvo XC90 cooling service, 390-195 provides the temperature control and sealing details expected in a standard replacement thermostat.

Key Features

• 195°F start-to-open temperature for regulated engine warm-up and coolant flow
• Copper case and wax compound for quick response to coolant temperature changes
• Offset design with air relief valve and jiggle pin weep hole
• O-ring seal included with rubber gasket/seal material
• OE-style construction made to OEM specifications and processes
• Sealing flange outside diameter: 2.32 in; height: 1.84 in
• Bypass diameter and bypass length: 0.98 in

Detailed Description

Motorad 390-195 is an engine coolant thermostat designed for precise temperature regulation in compatible Volvo cooling systems. The copper case and wax compound help the thermostat react quickly as coolant temperature changes, while the offset layout and air relief valve support proper coolant circulation and air management during service. This thermostat is built with OEM quality materials and safety standards by an OE supplier, and it includes an O-ring seal for installation where applicable. This part cross-references Gates 34057 for the same application.

Compatible With 1999-2005 Volvo S80, N/A and 2003-2005 Volvo XC90, N/A. It also fits 2006 Volvo S80, N/A and 2006 Volvo XC90, N/A. Use Motorad 390-195 when replacing a worn thermostat in Volvo S80 or Volvo XC90 cooling system service.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Overheating caused by a thermostat that opens late or sticks
• Coolant flow irregularities from a worn thermostat valve
• Sealing issues at the thermostat housing interface
• Air trapped in the cooling system after thermostat service

Installation Notes and Tips

Verify the 195°F temperature specification and OE thermostat/seal requirement before installation. Inspect the housing, sealing surfaces, and coolant condition during replacement, and confirm the bypass dimensions and flange measurements match the original part. Follow the vehicle service procedure for coolant refill and air bleeding to help restore normal cooling system operation.

Quality Assurance

Motorad manufactures this thermostat to OEM specifications using OE-supplier processes and materials. The design includes OEM-style seals where applicable, along with a copper case and wax compound intended to maintain consistent temperature response in standard automotive cooling service.