Avoid a trip to the mechanic by trying to troubleshoot problems yourself in your Nissan Pathfinder. While air conditioning problems are common, they are often quite simple to diagnose and even fix. Take a few easy steps to try and determine the cause of the air conditioning problems on your own.
See if the problem is as simple as a blown fuse first. It is probably a blown fuse if the temperature controls on the dashboard seem to work correctly but have no effect on the air. The fuse box in a Nissan Pathfinder is located by the brake on the left lower side of the steering wheel. Pry off the fuse panel cover and find the blown fuse.