It's buried in the dash near heater core, almost impossible to get to.
There are 2 common questions relating to the temperature blend door on a Taurus / Sable:What moves themHow to replace themThe "Related Questions" below address both
For a diagram consult: http://www.2carpros.com/forum/1999-ford-taurus--ac-suddenly-not-working!-vt155404.html What year Taurus? The linked answer specifically cites the temperature blend door actuator motor. See "Related Questions" below for more about it...
This sounds like a temperature blend door problem - with the door stuck in the heat position. See "Related Questions" below for information on Taurus/Sable blend door actuator motors and blend doors
The little motor that drives the temperature blend door is pretty much behind the radio.See "Related Questions" below for lots more about replacing it, and volumes of additional information about Taurus Sable heating systems & fixes
The blend door actuator can go bad. Big job to replace it. Dash assembly must be removed to gain access to it.
If "temperature control" means the device that adjusts the heating/cooling temperature, that would be the temperature blend door actuator motor.See "Related Questions" below for more about that and other Taurus / Sable heating problems and fixes
how to replace a blend door actuator on a 1999 ford ranger
In the trunk, I think
To replace a blend door on a 1999 Voyager, you will begin by checking which side of the vehicle is not receiving heat. Then, remove the glove box door by squeezing the inside of the door toward the center of the door to access the blend door.
To answer your question are you referring to your A/C and Heating temperature control unit? The temperature control which is next to the A/C control knob which you adjust the temperature from cold to hot? When you adjust it between cold and hot it opens a blend door via blend door motor to get the desired temperature.
Yes
The door is located behind the glove compartment. Remove the compartment and the ashtray. You will see a small white square box with an electrical wire connection. Its located there