Will your heater blow out hot air if your heater core is bad?

If your heater core is bad, your heater may not blow out hot air. A faulty heater core can lead to insufficient coolant flow, resulting in cold air being blown into the cabin. Additionally, a bad heater core may cause leaks or other issues that further impair heating efficiency. If you're experiencing this problem, it's advisable to have your heating system checked by a professional.