Q: Heater broken

Hi. When a heater core fails, it usually fails by leaking coolant into the passenger compartment in the vehicle. If your problem is that hot air is not being blown out of your vents, you could have several other issues. The heater is ran by the coolant in the engine. If the vehicle is low on coolant, it will not work correctly. If the system has been serviced recently, an air pocket can develop and not allow the coolant to flow to the heater core. Some vehicles have heater control valves that block off coolant to the heater core when the heater is not in use. If this valve fails, it will not allow the coolant to flow to the heater core. Lastly, the actuator under your dash can fail and not direct the air to the proper location for heating. A qualified mechanic, such as one from YourMechanic, will be able to inspect the heating issue and help you repair it.