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How do I know if my Dodge Challenger thermostat is bad?

If your Dodge Challenger is running hotter than normal or experiencing other cooling system issues, it's possible that the thermostat is malfunctioning. Knowing the signs of a bad thermostat can help you diagnose and fix the problem quickly.


Signs of a Bad Thermostat



  • Engine running hot: If your Challenger's engine temperature is consistently higher than normal, it could indicate a stuck-open thermostat.

  • Slow engine warm-up: A stuck-closed thermostat will prevent the engine from reaching its optimal operating temperature, causing a slow warm-up.

  • Coolant leaks: A faulty thermostat can cause coolant to leak from the housing or surrounding components.

  • Fluctuating temperature gauge: If the temperature gauge is rapidly changing between hot and cold, the thermostat may be stuck in an open or closed position.


These are the most common signs that your Dodge Challenger's thermostat needs to be replaced. If you notice any of these issues, it's best to have a mechanic diagnose and repair the problem as soon as possible to prevent further damage to your engine.


Diagnosing a Bad Thermostat


To confirm a bad thermostat, you can perform a simple test. First, let the engine cool completely. Then, remove the thermostat housing and observe the thermostat. If it doesn't open when the engine is warm, or if it doesn't close when the engine is cool, the thermostat needs to be replaced.


You can also use a digital multimeter to test the thermostat's resistance. With the engine warm, the thermostat should have low resistance, indicating that it's open. If the resistance is high, the thermostat is stuck closed and needs to be replaced.


Replacing the Thermostat


Replacing the thermostat in a Dodge Challenger is a straightforward process that can be done at home with basic tools. Be sure to use the correct replacement part for your vehicle's make, model, and year. Follow the manufacturer's instructions carefully to ensure a proper installation and avoid any leaks or other issues.


By understanding the signs of a bad thermostat and how to diagnose the problem, you can keep your Dodge Challenger running at its best and prevent more serious engine issues down the road.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.