OEM Toyota Sienna Thermostat

Toyota Sienna Thermostat Parts and Q&A

• Water Inlet
  90916-A3003
  Q: How to service the thermostat on Toyota Sienna?

  A:

  Service on the thermostat begins by draining coolant followed by battery removal paired with cleaning all air cleaning components including the cap sub-assembly and filter element sub-assembly and both air inlet and case components and bracket and inlet and Starter assembly. The water inlet service starts with removing the radiator hose outlet then unfastening the wire harness clamp followed by three nut and bolt removal to separate the water inlet. After that, remove the thermostat. New gasket placement on the thermostat should have the jiggle valve directed toward the upper stud bolt before inserting the thermostat into the water inlet housing while keeping the jiggle valve between 150 of either side of its recommended position. Install the water inlet while tightening its nut to 8.0 Nm (82 kgf-cm, 71 inch lbs.) alongside the bolt with 20 Nm (199 kgf-cm, 14 ft. lbs. torque). The repair process continues with starter assembly installation followed by air cleaner inlet numbers 1 and 2 and their corresponding components including air cleaner bracket and air cleaner case and air cleaner cap sub-assembly. Complete the procedure by adding coolant before checking the system for any engine coolant leakage.
• Thermostat
  90916-A3002
  Q: How to install the thermostat on Toyota Sienna?

  A:

  Before installation place the new gasket on the thermostat while positioning the jiggle valve upwards and setting it to a 10° angle from the exact position. You should install the water inlet by using two nuts which require a torque of 10 Nm (102 kgf-cm, 7 ft-lbf). The installation of No. 2 idler pulley sub-assembly includes attaching the idler pulley cover plate and idler pulley with a bolt which requires 43 Nm (438 kgf-cm, 32 ft-lbf) torque. The engine process includes attaching the No. 2 radiator hose before installing both the V-ribbed belt. Begin by adding the front fender apron seal on both the right-hand side and its corresponding right-hand front wheel. Add engine coolant after which you will install the No. 1 engine under cover. The last steps include examining coolant leaks before attaching the V-bank cover sub-assembly.