Heater not working

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your Impala. The issue you're describing, where the heater starts working when you hit the dash, likely points to a loose connection or a faulty component in the heater control circuit. It could be an issue with the blower motor resistor, the fan switch, or the wiring that has come loose over time. The action of hitting the dash temporarily restores function, which suggests an electrical connection that's intermittently working. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!