Overheating on 2000 Nissan Pathfinder

when the airconditioner is on for about an hour and above my temperature guage rises to a point the the car overheat. what is responsible for that

Asked by for the 2000 Nissan Pathfinder
First thing, don't let the engine overheat, this will damage your engine!
The overheating can be caused by several things, all of which need to be checked out. You could have a cooling fan that is not working properly, a radiator that is not working efficiently, make sure there is not a lot of debris on the front of the radiator (e.g. leaves or dirt), thermostat is not opening properly. These are some possibilities, but there are more. Try to get it looked at by a repair shop, and give a good explanation, like you did here. Here is a form you can fill out that will help: