Climate control only blows cold air?

Currently dealing with an issue of no heat in cabin. It doesn’t appear to be low on coolant, the in/out lines from the engine compartment both seem hot enough so I don’t think it’s the valve there, the fan blows fine on all settings but only blows cold air. However there is a terrible whine from under the dash and when you turn the climate control off you hear a loud click noise. I suspend it is either the mode or blend door actuator failed. I cannot figure out where the actuator is actually located. The car does not have a dual climate control system so it should only have one right? Is it passenger or drivers side?