A car engine is a heat engine, but there are various types of heat engines outside the realm of car and truck engines.
The heater in your car uses waste heat from the engine to heat the car. When the engine is not running there is no heat to distribute.
A heat engine that uses heat to do work
The Engine
heat It transfers engine heat from the coolant to the air inside the car.
The heat will also work when the car is turned on, but not moving. It uses heat from the engine.
Heat
heat engine and car
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
As a "heat engine", a car engine must rid itself of heat to continue. Efficiency of the heat engine depends on the difference in temperature; therefore, as the temperature outside reaches the temperature inside, the engine stops.
A car engine works by burning a fuel and air mixture releasing heat into the engine making it hot. The workings of the engine also involves friction which creates additional heat.
You can not get heat from cold water, The engine has to run long enough to get the water in the engine HOT. That is were you get heat from HOT WATER-- Coolent
it can cause to fire and