Where is the thermostst located on a 2000 subaru outback? also need info on flushing the raditor Thanks

Get your self some ramps pull the inspection cover off the botton on the car follow the fat hose up to where your themostat is remove hose and empty your block for antifreeze pull off old thermostat remove and replace then on passenger side radiator un screw plastic butter fly antifreeze will come out of there take bottle where antifreeze is and clean take cap off and clean catch all the antifreeze in bottles then you can flush system out drain water out same way when replacing antifreeze you need to open upper heater hose to burp system 50% 50% works fine unless you live here witch I run 75% anti 25% water I also own a 2000 subaru outback loaded

After replacing thermostat can i just put water in it to check if it works or do i HAVE to use coolant to work properly