A car’s coolant system usually purges itself. I would first ensure your radiator is completely full, and also check your over flow tank that should be at the “normal” mark. If you can’t see the mark, IIRC, there should be about 4 inches of coolant in it.
Next drive your car until it gets to a normal operating temperature (~195F), with the car still running crack open the purge valve right next to your thermostat valve. It is a small brass valve, open the inner part of it with a 6mm wrench. Purge until you get a solid stream of coolant, use a rag to catch it. Then get back in your car, drive around (highway speeds are best) then turn your heater on full heat. All the way to the red, any fan speed is fine. After about 2 minutes, put it back on cold. Wait a minute then go back to full heat. Now purge the thermostat again, and check the over flow for proper level. You should be golden, if not you have a blockage or something else going on.
