Just setting for a week can run the battery down. you need to make sure that your grounds are good, that your alternator is charging at the proper rate and that the voltage regulator is working properly. If all of this is good then you can start unplugging things that drain the battery, radio, power door locks, interior lights etc.. Or if you know how to use a multimeter you take measurements to try to figure out what is draining the battery. Just be aware that a bad ground and all of the stuff that is contantly on (clock, radio memory, ECU memeory...) will drain the battery some. the process of driving the auto daily maintians the battery charge. The newer the vehicle the more power they usually draw an a daily basis. With out further info it is impossible to know what is going on.
A raidator in need of a flush will not cause a battery drain.
Yes it can.
The wrong spark plug wire(s) can cause engine problems including not running but won't drain the battery.
A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Any light that is staying on will drain the battery. Also a stuck relay will drain the battery.
Dead cell in the battery. Something on which is drawing power from the battery. Stuck relay.
Dead cell in the battery, any light on the car that is staying on, or a stuck relay.
there is a short some where in the electrical system... or a bad battery.
If it stays on all the time it will drain the battery
A short in the wiring.
Dead cell in the battery or something is on pulling power from the battery. If it is a dead cell the battery must be replaced.
Shorted diodes in the alternator.