This morning i get into my car getting ready to go to school, and i put the key in the ignition and click it over twice. and my car starts up with all the needles and stuff still withouth the engine on.... All of a sudden i here this rumbling near the cabin air filter behind the glove box over and over again. is there anything i should be worried about. i think it was due to the air that was on, but i don't why it would be rattling.