Depending on the vehicle, you may need to raise the front end using a jack and jack stands.

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When to Replace a Thermostat.

Here's how to tell if you have one, and what to do if you don't. .

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I think the thermostat is doing its job.

what i need to know is if there is a wifi smart thermostat that can manage with 2 wires and not add the C wire – i don’t have a basement or attic and all the ceilings are finished. If you follow the upper radiator hose towards the engine, you will see the end of this

Remove the radiator cap and make sure the radiator is completely topped off.
A small leak or evaporation may cause your radiator to slowly lose coolant.
Look through the radiator filler neck to see if the coolant flows.

The coolant is a mixture of water and antifreeze that helps to keep your engine from overheating.