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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.

Step 1

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

Step 2

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.

Step 3

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

Step 4

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

Step 5

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.

Step 6

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

  • Mechanic's toolset, including a full socket set, wrenches and screwdrivers
  • Replacement thermostat, new or rebuilt
  • New gasket for thermostat

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