Today I told my sister to start the car and let it run with the heat going, she didn't start it and just let it sit with all the eletronics on AND fans running.

I go to the car after this has been happening for about 5 minutes and can't start it, feels like it has no power after you left the lights on and battery drained. It was no more than 5 minutes and I can still turn on the lights/stereo/etc yet I can't start my car.

 

does it click wen u try to start it?

 

The battery can still be too weak to start the car even if the lights, fans, stereo, etc. come on. Have the battery tested, it sounds like its bad