Cummins Thermostat Locations, Common Problems and Replacements

Whether you need to find the location of your 2012 Cummins thermostat or solve a 6.7 Cummins thermostat problem, it's crucial to understand what the thermostat does. As a key component of your diesel engine, its condition directly impacts engine performance and longevity.MyMROmarts will explain how to locate your Cummins thermostat and deal with common problems. With this knowledge, you can easily maintain your Cummins engine to ensure it always runs efficiently.

 

What Is a Cummins Thermostat and What Does It Do?

The thermostat is a key part of the engine cooling system. It is mainly responsible for regulating coolant flow to ensure the engine is maintained at the optimum operating temperature. By controlling the flow of coolant at a specific temperature, the thermostat prevents the engine from experiencing performance problems due to overheating or overcooling.

 

For Cummins engines, the health of the thermostat has a direct impact on engine fuel economy and service life. That's why knowing where your thermostat is located, how to replace it, and common problems is important.

 

2012 Cummins Thermostat Location

The 2012 Cummins 6.7L diesel engine thermostat is usually located at the front of the engine. Its location is mainly near the engine water pump and coolant outlet. Specifically, it is mounted in the coolant housing and connected to the coolant piping.

 

How to Find the Thermostat Location:

1. Open the engine cover and locate the coolant reservoir.

2. Trace the coolant lines from the reservoir to the housing that connects to the top of the engine.

3. The thermostat is usually mounted inside the housing near the coolant outlet near the radiator.

For Cummins 5.9L and 6.7L engines, this location is essentially similar. However, MyMROmarts still recommends that you double-check the specific model number to avoid miscalculation.

 

6.7L Cummins Thermostat Frequently Asked Questions

1. Stuck Thermostat

Sticking problems can also occur with the 6.7L Cummins thermostat due to impurities in the coolant or deterioration of the internal parts of the thermostat. This condition will cause the thermostat to not open or close properly and the following two problems will occur.

Engine overheating problems

When the thermostat does not open, the coolant cannot flow. This will cause the engine to overheat after a period of time.

Low Temperature

The thermostat is not closed and too much coolant flows. The engine cannot reach normal operating temperature.

 

2. Coolant Leaks

Damage to the thermostat housing or gasket can cause a coolant leak. This problem reduces cooling efficiency and can cause the engine to overheat.

 

3. Deteriorating Thermostat Performance

Over time, the thermostat's spring loses its elasticity. This can cause it to open or close untimely. This condition can also negatively affect the engine's fuel efficiency and performance.

 

Solution:

Check the coolant condition regularly.

Replace the thermostat gasket periodically.

Replace the thermostat when you experience problems with it.

 

How to Replace a 2012 Cummins Thermostat?

1. Prepare Tools and Materials

New thermostat

Wrench or socket tool

Coolant

Gasket or sealant

Container to collect coolant

 

2. Replacement Process

1: Drain the Coolant

First cool the engine completely.

Open the coolant drain and drain the coolant into a container for reserve.

 

2: Removing the Old Thermostat
Locate the thermostat housing and use a tool to loosen the retaining bolts.

Carefully remove the housing and remove the old thermostat and gasket.

Check the inside of the housing for any contaminants and clean it out.

 

3: Installing the New Thermostat

Place the new thermostat correctly inside the housing, ensuring that the orientation is consistent with the original factory specifications.

Install the new gasket and refasten the housing into place.

 

4: Refill Coolant

Fill the coolant to the proper level.

Start the engine and observe for fluid leaks. Check for proper coolant circulation.

 

Caution:

When replacing the thermostat, it is best to replace the coolant at the same time. This will improve the efficiency of the cooling system.

Check the thermostat opening temperature to ensure it matches the engine requirements.

 

Cummins thermostats play a key role in the engine cooling system. Whether you're looking for a 2012 Cummins thermostat location or dealing with 6.7 Cummins thermostat problems, understanding common thermostat issues and replacement methods can improve engine performance and longevity.

 

For cooling system operation, it is recommended that the thermostat and coolant status be checked regularly. If an aftermarket thermostat or other engine part needs to be replaced, choose reliable MyMROmarts that are guaranteed to be an exact match for your Cummins engine.