Calorstat TH4856.82J Engine Coolant Thermostat

Engine Coolant Thermostat for Volvo 240, 740, 760, 780, 940

Calorstat TH4856.82J is an OEM-grade engine coolant thermostat built for precise temperature control in select Volvo cooling systems. With an 82 C / 180 F start-to-open temperature, it helps regulate coolant flow to support stable engine operating temperature in classic Volvo 240, 740, 760, 780, and 940 applications.

Key Features

• OEM-grade standard thermostat for engine cooling service
• Start to open temperature: 180 F / 82 C
• Gasket included with rubber seal material
• Jiggle pin weep hole for air bleeding during service
• By-pass valve diameter: 29.0 mm
• Valve-seat diameter: 54.0 mm
• Sealing flange outside diameter: 2.12 in
• Height between flanges: 0.51 in

Detailed Description

Calorstat TH4856.82J is an engine coolant thermostat designed for direct cooling-system temperature regulation in Volvo 240, Volvo 740, Volvo 760, Volvo 780, and Volvo 940 models. This thermostat opens at 180 F, helping maintain the intended coolant circulation point for engines that rely on accurate thermal control. The included gasket and rubber seal support a proper housing seal, while the jiggle pin weep hole assists with air purging during installation and refill. This part cross-references Motorad 216-180 and 7216-180 for the same application. The TH4856.82J part number is also commonly searched by owners servicing older Volvo cooling systems.

Vehicle Fitment

• Fits 1991-1994 Volvo 940, N/A
• Fits 1990-1993 Volvo 240, N/A
• Fits 1985-1992 Volvo 740, N/A
• Fits 1990-1991 Volvo 780, N/A
• Fits 1990 Volvo 760, N/A
• Fits 1987 Volvo 760, N/A
• Fits 1985 Volvo 745, N/A

What This Thermostat 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 the housing
• Air trapped in the cooling system after service
• Seal leakage at the thermostat housing interface

Installation Notes and Tips

Install TH4856.82J with the sealing surfaces clean and free of old gasket material. Verify the thermostat orientation before assembly, and use the included gasket during reinstallation. After filling the cooling system, bleed trapped air according to the vehicle service procedure and confirm proper warm-up and temperature stability. For Volvo 240, 740, 760, 780, and 940 applications, confirm the housing and bypass dimensions match the original part before installation.

Quality Assurance

Calorstat supplies OEM-grade cooling components, and this thermostat is built to meet the dimensional and temperature-control requirements expected for service replacement use. Part number TH4856.82J is specified for select Volvo applications with an 82 C / 180 F opening temperature.