Many S197 Mustangs are plagued with HVAC blend door actuators that fail after a few years of service. Often times you get an audible "clicking" noise coming from your center console or behind your radio. Other times adjusting your A/C front cold to hot will not cause any change in temperature. If you experience any of these problems more than likely you have a Mustang door actuator failure.
This Mustang blend door actuator replacement is the ultimate solution to get your A/C functioning and cooling like it did when it drove off the showroom floor.
I have a 07 GT Convert and it seems that they have 2 actuators. One that uses a pivot arm (this part being reviewed) and the other with a gear instead of an arm.
This part replaces the actuator on the passenger footwell/sidewall side of the HVAC plumbing while the geared one replaces the one located in the center console.
the LRS-19616A is the motor that switches the door from AC to heater. Sounds like the one you are talking about is the LRS-19616B which selects whether the air blows out the defrost, center vents, or floor selection.