We have a 04 V50 and have major problems with the a/c fan turning itself on when the engine has been turned off and left idle for days at a time, the battery goes dead, the headlights come on and won't turn off..... at our wits end with it!!

We put a new battery in last week as we wondered if that was the problem?
The ignition was changed about a year ago and didn't get put on a computer afterwards as we were told it didn't need to? maybe this is the problem ??

Help we are running out of ideas and patience !!!