Calorstat TH6297.78J Engine Coolant Thermostat

Engine Coolant Thermostat for Honda and Acura

Calorstat TH6297.78J is a standard engine coolant thermostat for a wide range of Honda and Acura applications. It opens at 172°F (78°C) to help regulate coolant flow and maintain stable operating temperature in the cooling system.

• Standard engine coolant thermostat for cooling system service
• Starts to open at 172°F / 78°C
• Includes gasket and rubber seal
• Sealing flange outside diameter: 2.51 in.
• Height between flanges: 1.69 in.
• Direct fit coverage for many Honda Odyssey, Pilot, Accord, Ridgeline, and Acura MDX applications
• Part number: TH6297.78J

Fitment Coverage

• Fits 2002-2017 Honda Odyssey, N/A. Opening Temp: 78 C / 172 F.
• Fits 2003-2015 Honda Pilot, N/A. Opening Temp: 78 C / 172 F.
• Fits 2000-2014 Acura TL, N/A. Opening Temp: 78 C / 172 F.
• Fits 1996-1998 Acura TL, N/A. Opening Temp: 78 C / 172 F.
• Fits 2010-2014 Acura TSX, N/A. Opening Temp: 78 C / 172 F.
• Fits 2006-2014 Honda Ridgeline, N/A. Opening Temp: 78 C / 172 F.
• Fits 2001-2013 Acura MDX, N/A. Opening Temp: 78 C / 172 F.
• Fits 2010-2013 Acura ZDX, N/A. Opening Temp: 78 C / 172 F.
• Fits 1996-2012 Acura RL, N/A. Opening Temp: 78 C / 172 F.
• Fits 2002-2012 Honda Accord, N/A. Opening Temp: 78 C / 172 F.
• Fits 2012 Honda Crosstour, N/A. Opening Temp: 78 C / 172 F.
• Fits 2010-2011 Honda Accord Crosstour, N/A. Opening Temp: 78 C / 172 F.
• Fits 2000-2009 Honda S2000, N/A. Opening Temp: 78 C / 172 F.
• Fits 1995-2005 Acura NSX, N/A. Opening Temp: 78 C / 172 F.
• Fits 2001-2003 Acura CL, N/A. Opening Temp: 78 C / 172 F.
• Fits 1997 Acura CL, N/A. Opening Temp: 78 C / 172 F.
• Fits 1995-2001 Honda Prelude, N/A. OEM Recommended.
• Fits 1995-1997 Honda Accord, N/A. OEM Recommended.
• Fits 1995 Acura Legend, N/A. Opening Temp: 78 C / 172 F.

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 issues that affect heater performance
• Overheating concerns related to thermostat sticking or delayed opening
• Cooling system service on Honda and Acura vehicles such as the Odyssey, Pilot, and MDX

Installation Notes and Tips

Verify the thermostat opening temperature and housing dimensions before installation. This Calorstat TH6297.78J uses a gasket-style rubber seal, so the sealing surfaces should be clean and free of old gasket material before assembly. Confirm vehicle application by year, make, and model, especially on Honda Accord, Honda Odyssey, and Acura MDX fitments.

This part cross-references Gates 33877 for the same application.

Quality Assurance

Calorstat supplies a standard replacement thermostat with confirmed fitment coverage across 145 vehicle applications. The listed specifications, including the 172°F opening temperature and included gasket seal, support accurate cooling system service on compatible Honda and Acura models.