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I need to change my thermastat but can not locate it

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  • Toyota Master
  • 6,826 Answers

REMOVAL & INSTALLATION (4 Cyl. eng.) CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Position a suitable drain pan under the radiator drain **** and drain the cooling system.
  2. On the 1MZ-FE engine, remove the air cleaner cap assembly. Be sure to label all wiring disconnected.
  3. Disconnect the water temperature switch harness from the water inlet housing (except 5S-FE engines).
  4. Remove the oil filter on 5S-FE engines. On the 1MZ-FE engines, remove the heater hose covering the housing.
  5. Loosen the hose clamp and disconnect the lower radiator hose from the water inlet housing.
  6. Remove the two nuts from the water inlet housing and remove the housing from the water pump studs.
  7. Remove the thermostat and rubber O-ring gasket from the water inlet housing. To install:
  8. Make sure all the gasket surfaces are clean. Clean the inside of the inlet housing and the radiator hose connection with a rag.
  9. Install the new rubber O-ring gasket onto the thermostat. On 2SE and 3S-FE engines, align the jiggle valve of the thermostat with the protrusion on the water inlet housing. On 5S-FE engines, align the jiggle valve with the upper side of the stud bolt. On 2VZ-FE and 3VZ-FE engines, align the jiggle valve with the stud bolt. Insert the thermostat into the housing. Fig. 1: Remove the thermostat housing from the engine with the coolant temperature sensor - 1MZ-FE engine I need to change my thermastat but can not locate - 89553p18.jpg
    Fig. 2: Removing the thermostat from the engine - 1MZ-FE engine 89553p19.jpg
    Fig. 3: Always discard the old O-ring from the thI need to change my thermastat but can not locate - 89553p20.jpg reusing the old component 89553p20.jpg
    I need to change my thermastat but can not locate - 89553p21.jpg. 4: Always replace the thermostat with the correct temperature specifications
    Fig. 5: Line-up the jiggle valve with the protrusion on the housing - 5S-FE engine 89553g10.gif

  10. Position the water inlet housing with the thermostat over the studs on the water pump and install the two nuts. Tighten the two nuts tI need to change my thermastat but can not locate - 89553g11.gifs. (9 Nm) on 4 cyl. engines, 2VZ-FE and 3VZ-FE; 14 ft. lbs. (20 Nm) and 69 inch lbs. (8 Nm) on 1MZ-FE engines. Fig. 6: Thermostat installation - 2VZ-FE and 3VZ-FE engines 89553g11.gif
    NOTE: Don't forget to install a new O-ring onto the water inlet pipe. Apply soapy water to the O-ring prior to installation.
  11. Connect the lower radiator hose to the inlet housing and install the hose clamp. On the 3VZ-FE, tighten the bolt holding the water inlet hose to the alternator belt adjusting bar to 14 ft. lbs. (20 Nm). On the 1MZ-FE engine, tighten the bolt retaining the water inlet pipe to the cylinder head to 14 ft. lbs. (20 Nm).
  12. Attach the water temperature switch connector.
  13. On the 1MZ-FE engines, install the heater hose removed.
  14. Install the oil filter and check the oil level if removed. Install the air cleaner cap assembly on theI need to change my thermastat but can not locate - prev.gifengines.
  15. Fill the cooling system with a good brand of ethylene glycol based coolantI need to change my thermastat but can not locate - next.gifclass="h_mi">Start the engine and inspect for leaks.
prev.gif next.gif

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

MrScary66613
  • 1990 Answers

SOURCE: Can't locate the thermastat

Follow your Upper Radiator Hose to The Motor. It connects to a Bell Housing on the Block. Remove the Bellhousing and the Hose and the Thermostat is Right Underneath it. Please Rate my Response, I need all the Help That I can Get! Thanks!

Posted on Jan 27, 2009

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