What is oil radiators for heating in household, are they cheap to run in electricity
Aluminum
No
There have been cars without radiators. The old-style Volkswagen "Beetle", for example, had an air-cooled engine. A lot of VW owners modified the trunk (Beetles had the engines in the back, not the front) in order to force more air into the engine compartment, since they were prone to overheating as they aged.... which is one reason you don't see too many cars without radiators.
For an engine to run on the tracks without any cars.
Copper is used in motors, brakes, wiring, radiators, connectors, and bearings in both cars and trucks.
Some cars can run without the airflow meter (though not properly), others cannot run at all.
Eethylene Glycol
Of course theres cars with batteries already.
Yes but the check engine light will be on.
Not long, but it depends on the motor. Water is used in many boat motors to cool the engine and carry away exhaust. Motors that do not have radiators or heat exchangers will rapidly overheat if run without a supply of cooler water.
Teslas are cars that can run by themselves, without you having to steer them.