1999 Pontiac Sunfire ENGINE METER RUNNING SHOWS RUNNING HOT

WHERE IS THE THERMOSTAT LOCATED AND IS THERE A WEBSITE THAT I CAN GO TO TO SEE A VISUAL DIAGRAM?

ALREADY REPLACED
WATER PUMP
OVERFLOW CONTAINER
SERPENTINE BELT/SERPENTINE BELT TENSIONER
SPARK PLUG/SPARK PLUG SLEEVE
POLY-RIP BELT
AUTO BELT TENSIONER
HOSE CHECK OUT GOOD, NO LEAKS
FAN IS COMING ON

TRYING TO CHANGE THERMOSTAT BUT DON'T KNOW WHERE IT IS?