[helicopter23]

I have a 1997 Pontiac Grand Prix GT with 90k. About a week ago my car heater started acting up. The heat comes out warm instead of hot and the heater only works on the highest level (5). What's going on with the heater and is it an easy fix or will I have to take it somewhere, how much will parts and labor cost? By the way the heated seat seems to work fine and the rear window is fine. Thanks for the help.