If smoke, you may have a leak in a hose. When cool, check for water marks usually coming from the connection to the radiator. Another thing to do but may be dangerous is to load up the radiator with water and start the engine, let it run for about 15min for it to heat up and look for water spray. Also, when parked, is there a puddle of water under the car?
Also, I would check the water level in the radiator (never open when hot), to see if i need to add water. Don't look at the reservoir as a reference. It could be just low.
The key here is you think there may be smoke coming from the hood.
Another thing, if the radiator is full of water, then it could be your thermostat. it is usually located at the end of the top hose which runs from the radiator to the engine. In this picture, you are looking at the top of the engine looking down. This is the location of the Thermostat. If your vehicle is close to over heating, this valve could be getting stuck.
As a test, remove the thermostat and try driving it around to see if it gets close to overheating.
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