Is there a heater valve in Ford F-150 pickup trucks?

No, Ford F-150 trucks (at least those from the past couple of decades) do not use a heater valve in the traditional sense like some older vehicles or those with more complex heating systems. The flow of coolant to the heater core is controlled by a blend door actuator inside the HVAC system. This actuator is electronically controlled and adjusts the mix of hot and cold air, effectively acting as the control for the heater's function.