Calorstat TH6243.92J Engine Coolant Thermostat

Engine Coolant Thermostat for BMW Cooling Systems

Calorstat TH6243.92J is a standard engine coolant thermostat built for BMW cooling system service. It opens at 198.0°F and includes a rubber O-ring seal to support a secure housing seal during replacement.

Key Features

• Standard engine coolant thermostat for thermostat and housing applications
• Start to open temperature: 198.0°F
• Gasket or seal included: Yes
• Seal type: O-ring
• Seal material: Rubber
• Sealing flange outside diameter: 2.63 in.
• Valve-seat diameter: 67.0 mm
• By-pass valve diameter: 35.0 mm
• Height between flanges: 1.1 in.

Detailed Description

Calorstat TH6243.92J is an engine coolant thermostat for BMW applications that require a standard replacement thermostat with an integrated rubber O-ring seal. The thermostat’s 198.0°F opening point helps regulate coolant flow through the engine and radiator circuit, while the listed flange and valve dimensions support proper housing fitment. This part cross-references Gates 12190 for the same application.

Compatible With BMW 323i, BMW 323is, BMW 328i, BMW 328is, BMW 528i, BMW Z3, BMW 318i, BMW 318is, BMW 318ti, BMW 320i, BMW 325i, BMW 325is, BMW 525i, and BMW M3 applications listed below. The TH6243.92J part number is also referenced by multiple OE-style interchange numbers for BMW cooling system service.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after cold start
• Temperature fluctuation from a sticking thermostat
• Coolant seepage at the thermostat seal area
• Cooling system service on BMW models with the listed fitments

Installation Notes and Tips

• Verify housing condition and sealing surfaces before installation.
• Replace the thermostat only with the correct orientation and temperature rating for the application.
• Use the included O-ring seal and confirm it seats evenly in the housing groove.
• Bleed air from the cooling system after service to restore normal coolant flow.
• Confirm fitment by year, make, and model before ordering; TH6243.92J is used across multiple BMW 3 Series, 5 Series, Z3, and M3 applications.

Quality Assurance

Calorstat is listed as an OE supplier to BMW, and this thermostat is specified with application-relevant dimensions and sealing details for service replacement. The TH6243.92J part number is used across BMW cooling system applications from 1991 through 1999, including BMW 318i, 325i, 528i, and M3 fitments.

Fitment

• Fits 1998-1999 BMW 323i, N/A
• Fits 1998-1999 BMW 323is, N/A
• Fits 1996-1999 BMW 328i, N/A
• Fits 1996-1999 BMW 328is, N/A
• Fits 1997-1998 BMW 528i, N/A
• Fits 1997 BMW Z3, N/A
• Fits 1991-1995 BMW 318i, N/A
• Fits 1991-1995 BMW 318is, N/A
• Fits 1995 BMW 318ti, N/A
• Fits 1992-1995 BMW 320i, N/A
• Fits 1992-1995 BMW 325i, N/A
• Fits 1992-1995 BMW 325is, N/A
• Fits 1995 BMW 525i, N/A
• Fits 1991-1992 BMW 525i, N/A
• Fits 1994-1995 BMW M3, N/A