Heater in front of car blows cold air and back of car heater blows hot air

Hello, You likely have an issue with the blend door or blend door actuator for the front air. Your vehicle is always running the heater, but a door inside the HVAC central housing will block that hot air from running into the vents until you select the heater. If the blend door or the actuator that moves it has failed, you will not have access to the heated air, so cold air will continue to blow. Checking your fuses is not likely to turn up a bad one, but it is always worth a shot to test the fuses in the fuse panel before seeking diagnostic services and repair.