Calorstat TH6862.83J Engine Coolant Thermostat

Engine Coolant Thermostat for Porsche Applications

The Calorstat TH6862.83J engine coolant thermostat is a standard replacement thermostat for select Porsche cooling systems. It opens at 181.0 degrees to regulate coolant flow and help maintain stable operating temperature in Porsche 911, Boxster, and Cayman applications.

• Standard engine coolant thermostat for cooling system temperature control
• Start-to-open temperature: 181.0 degrees
• Gasket included for sealing at installation
• Seal type: gasket with metal seal material
• Sealing flange outside diameter: 1.57
• Height between flanges: 1.65
• OE supplier context for Porsche applications

Fitment and Application Details

Compatible with 1999-2008 Porsche 911, 1997-2008 Porsche Boxster, and 2006-2008 Porsche Cayman. This Calorstat TH6862.83J thermostat is a direct-fit cooling system service part for Porsche models that require a standard-opening thermostat at 181.0 degrees. This part cross-references Gates 33950 for the same application.

What This Thermostat Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after cold start
• Temperature fluctuation during normal driving
• Cooling system service needs on Porsche 911, Boxster, or Cayman
• Replacement of a thermostat with degraded sealing performance

Installation Notes and Tips

Verify the thermostat housing dimensions, sealing flange outside diameter, and height between flanges before installation. Replace the gasket seal during service and inspect the housing, coolant passages, and mating surfaces for corrosion or residue. Always refill and bleed the cooling system according to Porsche service procedures after installation.

Quality Assurance

Calorstat is listed as an OE supplier to Porsche, and this thermostat is built to match the specified application requirements for the 911, Boxster, and Cayman platforms. Part number TH6862.83J is also referenced by Motorad 462-180 and interchange numbers 99610612552 and 99610612553.