why would I not have heat when adjusting the climate control knob to heat?

Hello, either there is a problem with your engine generating heat, meaning it's not running warm enough to have hot coolant for your heater, or there's a problem with the temperature control inside the vehicle. The climate control system with the temperature control and blend doors related to it may be malfunctioning. The door mixing air temperatures may be stuck to the cold side. Hands on testing is needed. www.repairpal.com/repair-shops