Car overheats

You replaced the Stat now its hotter than usual-its fine w/o the Stat. Try a defective new thermostat. Its getting hot because the coolant is not flowing thru the engine, its being block by the Stat.

And who knows might be an air lock in it-try doing below and report back

BLEEDING COOLING SYSTEM:

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and

Should be to the side of the engine block-no plug-just follow the rest for atleast 5mins.