I have a '91 Accord that is having a battery drain issue. It jumps fine, and I can start the car back up if I start it the day after driving it somewhere. However, if I don't drive for a couple of days, I have to jump it to get it started. I have noticed that the fan that runs after shutting off the car has been running more often than it had been previously, and that it seems to be running while the car is running. When I shut off the car, the fan is already running, instead of the five minute or so delay that occured before. I have replaced the battery, and also the main relay, but both were after this problem started happening. What would cause this problem to occur?