AC works but heater doesn't.

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 Civic. If the blend door motor isn’t responding to the temperature knob, the issue might lie in the control unit, wiring, or climate control module that sends signals to the blend door motor. Inspecting the temperature control switch and wiring for any loose connections, corrosion, or damage could reveal the source of the issue. Alternatively, a diagnostic scan might help check for any errors in the climate control module. 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!