Why is the heater not working on my Jeep Grand Cherokee?

There are several potential reasons why the heater in your Jeep Grand Cherokee may not be working. Common issues include low coolant levels, a faulty thermostat, a malfunctioning heater core, or problems with the HVAC controls. Additionally, a blocked or damaged heater hose can also prevent warm air from reaching the cabin. It's advisable to check these components or consult a mechanic for a thorough diagnosis.