2012 jeep liberty No Heat problem, diagnostic

Quick run down on things to check when your car is blowing only cold air, no heat. Things to check: Coolant levels - low levels Leaky hoses Heater core - possibly plugged, need flush Heat blend door - possibly stuck or broken Heat blend door actuator - possibly stuck or brocken Air in Coolant system - let air out Thromostat - stuck open, need new thermostat Heater control valve - possibly faulty A great source of information is the autozone repair section!