The 6.7 Cummins engine has one main engine coolant thermostat. Knowing exactly how many thermostats a 6.7 Cummins has is the first step to diagnosing a cooling system problem or planning a replacement.
How many thermostats does a 6.7 Cummins have by year
The factory thermostat temperature rating depends on the model year of your engine. For 2007.5-2009 and 2013-2024 6.7L Cummins engines, the factory thermostat is rated at 190 degrees Fahrenheit. For 2010-2012 6.7L Cummins engines, the factory thermostat is rated at 200 degrees Fahrenheit. Using the correct temperature rating ensures the engine reaches its designed operating temperature for optimal performance and emissions control. If you are comparing Ford and Ram diesel cooling systems, see how many thermostats does a 6.7 powerstroke have.
Where is the thermostat located on a 6.7 Cummins?
The single thermostat is located near the front of the engine, integrated into the cooling system. It is housed within the coolant outlet housing on top of the engine block. Accessing the thermostat housing on some models may require removing the EGR crossover pipe. This placement allows the thermostat to regulate coolant flow from the engine to the radiator effectively.
Signs of a failing 6.7 Cummins thermostat
Over time, the thermostat's spring can lose elasticity, preventing it from opening and closing correctly. A defective thermostat can lead to engine overheating or running too cold, potentially causing internal damage. Common symptoms include the engine overheating, running too cold, or showing inconsistent temperature readings on the gauge. Addressing these signs promptly can prevent costly repairs.
6.7 Cummins thermostat replacement tips
Replacing the thermostat typically involves a direct-fit replacement unit. Genuine Cummins thermostats usually include the necessary seal for installation, simplifying the process. Aftermarket thermostats are available, but some sources suggest potential issues with their performance compared to genuine Cummins parts. Using a quality replacement ensures reliable operation.
Can I use a 190°F thermostat in a 2010-2012 6.7 Cummins?
Installing a 190-degree thermostat in a 2010-2012 truck (originally 200-degree) can result in the engine running cooler. This will cause the engine to run cooler than the original 200°F specification. While possible, this change may affect engine performance and emissions system operation, as the engine is designed to run at the higher temperature.
