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How to Change the Thermostat in a Mazda 6

by Contributor

Since its debut in 2003, the Mazda 6 has managed to stand out among its competition in the mid-size sedan market. The first generation boasted a "European footprint," loads of charisma, great handing and an unchallenged ability to engage the driver. A four-cylinder engine provided 106 horsepower. Follow this do-it-yourself information to change the thermostat in a Mazda 6.

Disconnect the battery ground cable. Drain the coolant from the system and store it in an appropriate container. Take out the drive belt.

Leave the pipe connected to the power steering pump and remove the pump with the pipe as a single unit. Push the power steering oil pump out of the way.

Take the water hose and the lower radiator hose from the thermostat. Remove the thermostat fasteners.

Lift out the thermostat housing, the thermostat and the gasket. Remove the gasket and discard it.

Install a new gasket to the thermostat and then set the thermostat in place. Set the thermostat housing in position and torque the fasteners to 71 to 101 inch pounds.

Fill the cooling system with the appropriate type and mix of coolant. Recycle the coolant when possible.

Reconnect the battery ground cable. Start the engine and test for coolant leaks.


  • The hoses slide onto fittings or connectors that grip the individual hose and hold it in place with a clamp. No special tools are required to remove or reconnect hoses. Label the hose and its connectors before separating.


  • Dogs and cats are attracted to and will drink coolant left in open containers or puddled on the floor and ingestion is often fatal. Drain coolant into a container that can be sealed. Reuse the coolant unless it is contaminated or old.

Items you will need

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