Calorstat TH5111.80J Engine Coolant Thermostat

Engine Coolant Thermostat for BMW and Jeep

Calorstat TH5111.80J is a standard engine coolant thermostat built for precise coolant flow control in a range of BMW and Jeep applications. It opens at 176.0°F and includes an O-ring seal, helping maintain stable operating temperature in everyday driving and under load.

Key Features

• Standard engine coolant thermostat for cooling system service
• Start-to-open temperature: 176.0°F
• Gasket or seal included; O-ring seal type with rubber seal material
• Sealing flange outside diameter: 2.63
• Valve-seat diameter: 67.0
• By-pass valve diameter: 35.0
• Calorstat TH5111.80J cross-references OE-style applications for BMW and Jeep platforms

Fitment and Application Details

Compatible With 1995-1996 Jeep Cherokee, N/A; 1995-1996 Jeep Grand Cherokee, N/A; and 1995 Jeep Wrangler, N/A. It also matches multiple BMW applications, including 1987-1993 BMW 325i, 1986-1993 BMW 535i, 1985-1992 BMW 735i, 1988-1992 BMW 735iL, 1987-1991 BMW 325is, 1988-1991 BMW 325iX, 1989-1990 BMW 525i, 1985-1989 BMW 635CSi, 1987-1988 BMW 528e, 1982-1983 BMW 528e, 1988 BMW 535is, 1984-1987 BMW 325e, and 1986-1987 BMW 325es. Vernet is an OE supplier to BMW, which supports the application coverage for these BMW cooling system repairs.

What This Thermostat Helps Address

• Engine running too cool or too hot due to thermostat wear
• Slow warm-up after cold starts
• Temperature fluctuation from a sticking thermostat
• Cooling system service on BMW and Jeep vehicles with the listed applications
• Coolant flow control issues that affect heater performance and engine temperature stability

Installation Notes and Tips

Replace the thermostat with the included O-ring seal and verify the sealing surfaces are clean before assembly. Confirm the thermostat orientation and bypass-side dimensions match the original unit before installation. After service, refill and bleed the cooling system according to the vehicle procedure to remove trapped air and verify normal operating temperature.

Quality Assurance

Calorstat TH5111.80J is built as a standard replacement thermostat with OE-supplier lineage through Vernet for BMW applications. The part number TH5111.80J is also referenced by multiple aftermarket and OE-style listings, including Motorad 247-174 and Stant 13588 for the same application.