First you need to make sure it is actually not heating up. Do this by checking to see if the radiator hoses are getting warm after running for 10-15 min. Be careful they could be HOT. If the hoses are hot then the heater core is plugged and will need to be replaced. If hoses do in fact not get hot then the thermostat is most likely stuck open. removing it will tell the tale.
Heat, lack of lubrication, or coolant in the cylinders or oil pan.
The combustion process cause the engine to heat up.
what causes rear wheel rotors to heat up
FRICTION
No heat coming from the heater and the car overheating is usually the thermostat stuck closed. The thermostat is supposed to open up at a certain temperature allowing the engine to warm up quickly.
the sun
The roof of your car gets hot in the sun because it absorbs the sun's energy and heat, which causes the materials to heat up. This is due to the process of solar radiation, where the sun's rays transfer energy to the car's surface, leading to an increase in temperature.
If you run your car with the emergency brake on it will heat the car up.
The heat from the friction of the tire rolling at a high speed on the street causes the rubber to slowly burn up.
The Greenhouse effect...
The friction of running car tires on a road primarily causes kinetic energy to be converted into heat energy. This heat energy is a result of the resistance that occurs between the tires and the road surface, ultimately leading to a loss of energy in the form of heat.
Car heaters need a few moments to warm up.