Thermostat (3rd gen) answers !

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Ben Schneider, Mar 7, 2019.

  1. Ben Schneider

    Ben Schneider Junior Member

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    so very little info on thermostats !

    seems after a lot of looking, that the oem temp is 180 ?

    after reading reviews, seems most thermostat manufacturers don't even get 4 out of 5 stars

    who manufactures prius thermostat ?

    is it aisin ?

    thermostat is located literally on the opposite side of the water pump mount (wish i had known this before changing, more coolant to waste)

    here is the first video i found on how to change



    anyone have experience with motorad, gates, replacement brands of thermostats ?
     
  2. Ben Schneider

    Ben Schneider Junior Member

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  3. Ben Schneider

    Ben Schneider Junior Member

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    frustrating that thermostat is an expensive assembly and not on top of the engine like most cars
     
  4. ChapmanF

    ChapmanF Senior Member

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    Right in the repair manual, open between 80 and 84 C (176 to 183 F), lift by 10 to 14 mm at 95 C (203 F), should be fully closed below 77 C (171 F). More information than that might be harder to find. :)

    They're nearly bulletproof. Expanding wax opens them, a big spring closes them. To get one to jam open, you'd need corrosion or grot stuck in it, neither of which should happen if the coolant is changed often enough to keep the corrosion inhibitors active. Only way to make one fail closed is to severely overheat the engine some other way until the wax blows out. Other than those failure modes, who ever needs to replace one?
     
    Robert Holt likes this.
  5. Ben Schneider

    Ben Schneider Junior Member

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    much appreciated...

    changed coolant a few times in the last few weeks... some white translucent chips were in the second, looked like coconut chips... i hope that is not wax, will post photo in next post
     
  6. Ben Schneider

    Ben Schneider Junior Member

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    White chips
     

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  7. ChapmanF

    ChapmanF Senior Member

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    Corrosion products of aluminum in a liquid can have that white crystally/flaky look too. Had it gone a long time without a coolant change?
     
  8. Ben Schneider

    Ben Schneider Junior Member

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    appreciated. been quite a long drive.
     
  9. Lino

    Lino Member

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    Why would you want to change the thermostat, my experience with thermostats is they stick closed and engine gets hot very fast, if the temperature is maintaining around 190, then there is nothing wrong with the thermostat, mine is pushing 290 k
     
  10. Ben Schneider

    Ben Schneider Junior Member

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    it's pretty common practice to change thermostat every 50 or 100k... since i changed the water pump it's been running a few degrees hotter than it did before (i also changed pcv valve if that is any factor)
     
  11. Lino

    Lino Member

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    Even if a thermostat cost the price of a beer, your wasting your money when you could enjoy a cold beer instead
     
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