1998 Ford Taurus, I've noticed the heat is not working and it starts overheating randomly. What's wrong?

1998 Ford Taurus, I've noticed the heat is not working and it starts overheating randomly. What's wrong? - 1

Car is kinda old, take to repair shop.

Sounds like a bad thermostat

Could just be low on coolant.
If it gets too low an air bubble(s) will form and travel around the system.

If the thermostat isn't submerged, it won't open.
If the heater core is full of air it won't put out any heat.

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