CHEVROLET CAVALIER THERMOSTAT

Need To Know How To Replace The Thermostat

2002 Chevy Cavalier Is Overheating. The Gauge Runs About Halfway, Then Will Go Almost All The Way To Hot For Several Minutes And Then Back...

The Water In The Reservoir Is Slowly Steaming Out Of The Overflow Tube When It Reaches About 197 On The Gauge. I've Flushed The System...