OEM Toyota Sequoia Thermostat

Toyota Sequoia Thermostat Parts Questions & Experts Answers

• Thermostat
  90916-03100
  Q: How to service the thermostat on Toyota Sequoia?

  A: The service process of a thermostat requires all engine coolant to be drained before proceeding. Begin the water inlet service by detaching it from the water inlet housing through removing the 3 nuts. Start by discarding the thermostat followed by removal of its gasket. To inspect the thermostat you should heat water while submerging the component to verify its valve opening temperature is within the range of 80 - 84 degrees Celsius (176 - 183 degrees Fahrenheit). The thermostat needs replacement if these criteria are not met. A thermostat replacement is necessary if the valve lift is less than 10 mm (0.39 inch) while operating at 95 degrees Celsius (203 degrees Fahrenheit). You should replace the thermostat when it fails to completely close below 40 degrees Celsius (104 degrees Fahrenheit). Insert the new gasket onto the thermostat before placing it into the water inlet housing with the jiggle valve oriented straight upward toward 30 degrees of either side of the designated position. Screw and tighten the three water inlet nuts to 19 Nm (195 kgf-cm, 14 ft. lbs.). Check the engine oil level and top it up if necessary. Subsequently start the engine and validate coolant leaks before rechecking the coolant amount.