Why does my car make noise when they key is in the On positon, yet the car is not on?

Question:
When I put the key to the on position, i get a humming noise coming from the engine. And if I press the accelerator it makes a hissing noise that is scaled to how much I press on it. The car is a 2003 Suburu Forester with 70k miles. Don't understand why anything at all should be running when the key is only in ON. Any help or ideas to whats happening would be appreciated.

Answers:

what does a plasma booster do for a car?

does the noise stop? it could be fuel pump running or the electric fans running.

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is disc breaks better than drum brakes?

most likely either the fuel pump or the fan.

The ventilation system in my car is broken?

probably nothing to worry about.

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Want to know whats it worth?

when the ignition switch in in the ON position it means all your electronic stuff is on and you are draining your battery. The humming is most likely your fan. the hissing noise may just be the pressure in the pedal.

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What could be causing my car to nearly overheat when sitting still and running.?

it's a reminder so you don't lock your keys in the car

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