No. It is not the thermostat. You are just low on coolant. The reason for the low coolant is either the fan is not working, the head gasket is blown, or the coolant system has a leak.
The fan is easy to check. When the temp comes up then the fan should come on.
The head gasket is easy to check also. Your oil will be milky white.
And if the radiator, radiator hose, or gasket leak can be harder to find.
The heater not working is because there is not enough water to heat the heater core.
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If the coolant level in the unit is filled, the vehicle is not running hot, or there is no milky substance (for example, coolant leaking from the engine head gaskets into the oil), you might suspect the Coolant Level Indicator Sensor (either in the coolant container or along side the radiator (about $50-75 part).
First look for a coolant leak, and check the level, you have low coolant level
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