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How do you replace a thermostat on a 2002 toyota celica

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Toyota Celica, Corolla, ECHO & MR2 1999-05Toyota Celica, Corolla, ECHO & MR2 1999-05

2002 Toyota Celica 1.8L MFI DOHC 4cyl


The thermostat is located in the water inlet housing that is connected to the lower radiator hose.
The thermostat is equipped with a by-pass valve. If the engine tends to overheat, removal of the thermostat would cause a decrease in cooling system efficiency.

CAUTION NEVER drain coolant directly onto the ground! 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.
how do you replace a thermostat on a 2002 toyota - d4c6b82.jpg

Fig. The oil filter must be removed to access the thermostat on the 5S-FE engine

  1. Position a suitable drain pan under the radiator drain **** and drain the cooling system.
  2. On the 7A-FE engine disconnect the engine coolant temperature switch harness from the water inlet housing.
de1afd5.jpg

Fig. Disconnect the engine coolant temperature switch wiring located on the side of the thermostat housing
  1. Remove the oil filter on 5S-FE engines.
  2. Loosen the hose clamp and disconnect the lower radiator hose from the whow do you replace a thermostat on a 2002 toyota - d253a81.jpghousing.
d253a81.jpg


Fig. ... then slide the hose off the thermostat housing
    Remove the two nuts from the water inlet housing and remove the housing from the water pump studs.
f78b0a7.jpg

Fig. Only two nuts hold the housing to the cylinder head

de736how do you replace a thermostat on a 2002 toyota - f722bd2.jpgss=

Fig. Pull the housing straight out to remove


  1. Fig. Then pull the thermostat and gasket out

    bd62248.jpg

    Fig. Sometimes the gasket is stuck and has to be pried out of the head
    To install:
    1. Make sure all the gaskhow do you replace a thermostat on a 2002 toyota - abce49b.jpg are clean. Clean the inside of the inlet housing and the radiator hose connection with a rag.
    2. Install the new rubbehow do you replace a thermostat on a 2002 toyota - edd75f2.jpgsket onto the thermostat. On 5S-FE engines, align the jiggle valve with the upper side of the stud bolt. Insert the thermostat into the housing.

      Fig. Only use the correct temperature range thermostat when for replacement

      edd75f2.jpg

      Fig. Align the jiggle valve within a 10°gap of the stud bolt-7A-FE engine

      d56a45f.jpg

      Fig. Align the jiggle valve within a 5°gap of the stud bolt-5S-FE engine
      1. Position the water inlet housing with the thermostat over the studs on the water pump and install the two nuts. Tighten the two nuts to 78-82 inch lbs. (9-10 Nm).
      Don't forget to install a new O-ring onto the water inlet pipe. Apply soapy water to the O-ring prior to installation.
      1. Connect the lower radiator hose to the inlet housing and install the hose clamp.
      2. Attach the water temperature switch connector.
      3. Install the oil filter and check the oil level if removed.
      4. Fill the cooling system with a good brand of ethylene glycol based coolant.
      5. Start the engine and inspect for leaks.
      1. Remove the right hand cover under the engine.
      2. Drain the engine coolant.
      3. Remove the fan and generator V belt.
      4. Remove the generator assembly
      5. Remove the water inlet via the two nuts.
      6. Remove the thermostat.
      To install:
      1. Install a new gasket onto the thermostat.
      2. Install the thermostat with the jiggle valve upward. It can be set within 10 degrees on either side of the prescribed position.
      3. Install the water inlet via the two nuts. Torque to 8 ft. lbs. (11 Nm).
      4. Install the generator assembly.
      5. Add engine coolant.
      6. Inspect for leaks.
      7. Replace the cover under the engine.
      I hope help you with this (remember rated this help) Good luck.

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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