Must be sticking, replace the thermostat.
no, the thermostat would have nothing to do with the car not starting.
thermostat is frozen.
Usually the car would run cool, unless the thermostat is stuck partially open.
Yes, it controls the coolant flow around the engine block, without coolant the engine would overheat.
Yes a bad thermostat would cause overheating in any car. A thermostat regulates the temperature.
is car thermostat necessary in a tropicalize car?
Would need to know if car was overheating before waterpump and thermostat was replaced.
Insufficient amount of coolant or thermostat not opening
jump on the car
If the thermostat is broken in the closed position the engine would overheat rapidly. If it was broken in the open position the engine cooling system would not reach normal operating temperature and the heater would produce only warm air. Take the thermostat out and put it in a pan of water on the stove. When the water gets to around 200 deg F, the thermostat should open. If it doesn't it needs replaced. Observe carefully that you have not installed the thermostat upsidedown.
The answer depends on the car.
you need a new thermostat