why does my car make a humming noise when i turn it off?

most likely it is the cooling fan,cooling the motor down to the right temp.

approximately to vote for you gary many times might yet concept-approximately another ingredient. ok the place is the sound coming from? regardless of if that's by way of the radiator then that's maximum probable the fan. yet while that's below the sprint that's maximum probable the ac fan(happens with digital ac/warmth controls after long sessions of use now and back). can be the wiper motor(in all likelihood rear- wiring undertaking)(would be a noisy humm). or confident gasoline pump(would be in the direction of the tank) no count number what that's that's a relay undertaking and you will desire to disconnect the battery for no less than 15 (the useful AND damaging) minutes then reconnect it this might reset the equipment and would restore the priority for now regardless of if that's ac controls appropriate. reconnect the battery turn the biggest on wait some seconds initiate the engine enable it idle for a minute then close it off. regardless of if it remains making the humming sound locate out from the place moving around the engine bay lisening the place the humming is the loudest (shop your hands faraway from the fan/warm surfaces) after which you would recognize what relay is caught. goodluck

It depends on what kind of humming noise it is. Is it from the engine compartment, dashboard or rear of the car?

fuel pump runs for a few seconds after the car is shut off.

seems like you car is running hot. try replacing the thermostat and go from there.