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How to Change the Thermostat in a Toyota Tundra

by Contributor

The Toyota Tundra was designed to provide a user-friendly ride to the office and for weekend trips to the home improvement store. Changes were made in later generations of the Tundra with the hopes of drawing in the more serious pickup buyer. The following steps detail the installation of a new thermostat on the Tundra's 4.7L and 3.4L engines.

Step 1

Make sure the engine and radiator are completely cool before starting this procedure. Disconnect the battery ground from the terminal.

Step 2

Drain the coolant from the cooling system. Store the coolant in a container that can be securely sealed or properly dispose of the coolant.

Step 3

Loosen and remove the three nuts that old the water inlet in place. Take the water inlet from the water inlet housing.

Step 4

Lift the thermostat out with its gasket. Remove the gasket and discard it.

Step 5

Set a new gasket in the thermostat. Position the thermostat with the jiggle valve facing up.

Step 6

Replace the water inlet and set the nuts in place. Torque the nuts to 14 foot pounds.

Fill the engine with the recommended type and mix of coolant. Start the engine and check for leaks. Add coolant as needed once it has had a chance to circulate.

Warning

  • Drain coolant into a sealable container. Reuse the coolant unless it's 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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