thermostat on 1994 Toyota Previa

I need to know where the thermostat is located on a 94 Toyota Previa 4 cylinder and how to change it and how difficult this will be. Thank you

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1 answer
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http://bit.ly/autozone_repair_info
http://bit.ly/alldata_repair_manuals 
http://bit.ly/mitchell_repair_manuals_online