Car overheated after 1/2 a mile of driving?

Okay so I just installed a new thermostat and I went out to test the car. Before the car would overheat after about 30 minutes of driving.

So I haven't really driven this car alot lately because of the overheating.

Today I went and changed the Thermostat. Some anti-freeze came out during the installation but I did pour some into the radiator. Not that much though.

I went to test it out and the car overheated after just 1/2 mile of driving? Is this because I might have installed the thermostat wrong or did by water pump or something just go bad at me at that exact moment.

Oh I turned on the heater and it blew cold air at me.
 
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