If your 2005-2009 Mustang heater isn't working it may be time to replace your heater core. A faulty heater core can also result in a coolant leak onto your floorboard which causes steamed up windshields, strong coolant smells in your car and a constant wet floor on your passenger side floor board. Our direct replacement S197 heater cores will solve these problems and get your heater working like new again. Look no further than Latemodel Restoration for all of your 05-09 heater core needs!