You can heat your car without running the engine by using a portable car heater that plugs into the cigarette lighter socket or by using a heated blanket or seat warmer.
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When the engine is turned off, the car heater can still work by using the remaining heat stored in the engine and circulating it through the car's heating system. This allows the heater to continue providing warmth inside the car even when the engine is not running.
When a car is switched off, the engine stops running and there is no longer any power being generated to maintain the car's speed. Without the engine running, there is no energy being produced to keep the car moving, so it slows down due to the forces of friction and air resistance.
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.
When a car is turned off after running, the engine continues to radiate heat due to residual heat energy. This heat can transfer to the surrounding components, including the cooling system, causing the water temperature to rise momentarily before it begins to cool down. This is a normal process and should not be a cause for concern as long as the temperature does not exceed the operating limits.
When the air conditioning is turned on, the compressor of the system adds an extra load on the engine, which in turn generates more heat. During high noon, the ambient temperature is already high, contributing to the overall temperature rise of the engine. This combination of factors can lead to an increase in the engine temperature when running the air-con at that time.