1999 Toyota Sienna LE thermostat location?

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Thread: 1999 Toyota Sienna LE thermostat location?

  1. #1
    Junior Member
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    1999 Toyota Sienna LE thermostat location?

    I have a 1999 Toyota Sienna LE (6 cyl)

    Where is the thermostat located? How hard is it to get to (how may bolts to remove, etc)? Should I change the thermo with the hoses and new coolant? Do you really need a Genuine Toyota thermostat or will the friendly auto parts version due?

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  3. #2
    jc
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    Re: 1999 Toyota Sienna LE thermostat location?

    Ricecooker,

    Here is a link to the components for the thermostat
    http://minivanclub.org.ua/info/Sienn.../ther/comp.pdf

    Here is the link for the removal of the thermostat.
    http://minivanclub.org.ua/info/Sienn.../ther/remo.pdf

    The link to the whole user manual is right here
    http://minivanclub.org.ua/info/Sienn.../ther/remo.pdf.

    Are you sure you need to replace the thermostat? What are your issues? Over heating?

    Regards, Jason.
    1998 Sienna XLE Silver Spruce Metallic
    Air Lift 1000's
    Bridgestone Ecopia Summer/Bridgestone Blizzaks Winter
    273,xxx kms

  4. #3
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    Re: 1999 Toyota Sienna LE thermostat location?

    Buy a Toyota thermostat, and replace them at around 100,000 miles or 5 years. Brand X may or may not be as durable, and there is such a thing as false economy. Some say the Toyota thermostats never need replaced, but I talked to an engine rebuilder who says he sometimes gets Toyota heads to rebuild or replace, somewhere around 150,000 miles, because of bad thermostats.

    For a number of reasons, it is not always a good idea to wait until a part fails to replace it, and a thermostat is the best example I can think of, because you just blew $2,000 in repairs when that sucker breaks.

    Keep good coolant in the cooling system. It won't break you.

  5. #4
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    Re: 1999 Toyota Sienna LE thermostat location?

    Here is a link to the first in a series of pictures of the thermostat replacement job on my 2003 which should be almost identical to what you need to do on your '99.
    http://rides.webshots.com/photo/2346...11220610ioJwMv

    The "O" rings are for the tube that you need to remove and the thermostat gasket.

    Your 1999 Sienna came from the factory with Toyota RED coolant, not pink.
    I would recommend sticking with the red coolant.
    I would also undo the Zip tie that holds the front Air / Fuel (Oxygen) sensor to the radiator hose before pulling the hose off.


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