Having problems with my cars ac system?

I have a 1998 Honda Accord and my vents are blowing air even when all lights are off. The ac control knob is also in the off position. This usually happens at higher speeds. Will stop when I'm at a stop sign or at a red light. Is this going to be a big fix for me? Will it cause any problems for the battery? Any help will be appreciated.

I'm not sure this is a problem at all. I think it's pretty common for cars to have a passive ventilation system so that some air is forced through the vents when the car is at speed. This is to keep the car properly ventilated when the ventilation fans are turned off, or in case the fans fail.

I suggest you check with the owner's hand book to see if this is how the system is designed to operate.

Hi the best thing to do to answer your questions is take it to a honda dealer for some diagnostics.

You have the vent open, which means air from the out side passes into the car as you increase speed gee more air is going to come in and when you stop none

Set the darn air intake to recirculate if it bothers you that much. When the windshield fogs up put the control back to the fresh air position.