WARNING: This page is about a different car, the 2003 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pinpoint Test S: The Temperature Control Is Inoperative Using The Front Auxiliary Climate Controls (Steps S1 & S2)
Courtesy of FORD MOTOR CO.
Fig 2: Pinpoint Test S: The Temperature Control Is Inoperative Using The Front Auxiliary Climate Controls (Steps S3 & S4)