Stant 48839 Engine Coolant Thermostat

OE Type Thermostat for Volvo Cooling Systems

Stant 48839 is an engine coolant thermostat built to OE-type dimensions and temperature control for select Volvo applications. It is set to open at 194 degrees Fahrenheit and uses a stainless steel assembly for smooth operation and consistent coolant flow.

Compatible with 1999 Volvo S80 and 1999-2005 Volvo S80, as well as 2003-2005 Volvo XC90, this thermostat is a direct-fit cooling system service part for vehicles that require OE temperature control. The Stant OE Type Thermostat line focuses on original equipment design and durable construction for long service life.

Key Features

• Part number: 48839
• OE-type thermostat design for factory-style fit and function
• 194 degree Fahrenheit opening temperature
• Stainless steel assembly engineered for smooth performance
• Durable material construction for extended service life
• Bypass plate diameter: 0.98 in.
• Flange diameter with seal: 2.37 in.
• Height from flange to bottom: 1.29 in.
• Height from flange to top of bridge: 0.77 in.

Product Details

The Stant OE Type Thermostat product line is built around original equipment design standards for drivers who need accurate coolant temperature regulation. This thermostat opens at 194 degrees Fahrenheit, helping maintain the engine’s intended operating temperature in Volvo S80 and Volvo XC90 cooling systems. Stant 48839 uses a stainless steel assembly and durable materials to support steady operation under normal thermal cycling.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Thermostat Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation during warm-up
• Temperature fluctuation from a sticking thermostat
• Cooling system service on Volvo S80 and Volvo XC90 models
• Replacement of an OE-style thermostat set to 194 degrees

Installation Notes and Tips

Verify the thermostat housing dimensions and temperature rating before installation. Confirm the seal condition and cooling system cleanliness during service, and follow the vehicle manufacturer’s coolant fill and bleed procedure after replacement. For fitment, this part is listed for 1999 Volvo S80, 1999-2005 Volvo S80, and 2003-2005 Volvo XC90.

Quality Assurance

Stant manufactures this OE Type Thermostat with original equipment design intent, durable materials, and a stainless steel assembly for consistent performance in the specified Volvo applications.