Section 573 (Cooling System): Thermostat: Replacement

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

DISCONNECT BATTERY NEGATIVE TERMINAL
DRAIN ENGINE COOLANT (See REPLACEMENT )
REMOVE RADIATOR LOWER AIR DEFLECTOR (See STARTER )
REMOVE AIR CLEANER INLET ASSY (See STARTER )
REMOVE AIR CLEANER ASSY (See STARTER )
REMOVE WATER INLET PIPE
1. Remove the bolt and water inlet pipe.
2. Remove the O-ring from the water inlet pipe.
  
  Fig 1: Removing Water Inlet Pipe
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE WATER INLET
1. Disconnect the wire harness clamp.
2. Remove the 3 nuts and water inlet.
  
  Fig 2: Identifying Water Inlet
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE THERMOSTAT
1. Install a new gasket to the thermostat.
2. Align the thermostat jiggle valve with the upper stud bolt, then insert the thermostat in the water inlet housing.
  HINT:
  
  The jiggle valve may be set within 15° of either side of the prescribed position.
  
  Fig 3: Installing Thermostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSTALL WATER INLET
Torque: 8.0 N.m (82 kgf.cm, 71 in.lbf)
INSTALL WATER INLET PIPE
1. Install a new O-ring to the water inlet pipe.
2. Apply soapy water to the O-ring.
3. Connect the water inlet pipe to the water inlet.
4. Install the bolt which is used to fixes the water inlet pipe to the cylinder head.
  Torque: 20 N.m (199 kgf.cm, 14 ft.lbf)
INSTALL AIR CLEANER ASSY (See STARTER )
INSTALL AIR CLEANER INLET ASSY (See STARTER )
CHECK CONNECTION OF VACUUM HOSE (See REPLACEMENT )
ADD ENGINE COOLANT (See REPLACEMENT )
CHECK FOR ENGINE COOLANT LEAKS (See ON-VEHICLE INSPECTION )