Exc. Riviera: Installation

Install programmer to A/C module. Place control panel thumbwheel in highest temperature position and install vacuum harness and electrical connections.
Check that air-mix door is in full heat position. The blower air flow will now hold air-mix door in proper positions.
Without disturbing door rod or Output shaft position reconnect door rod to programmer (snap into retainer). Remove 3-wire connector from programmer and check for full travel of air-mix door. If necessary, adjust programmer as described in this article.

Fig 1: Removing Programmer Assembly (Century & Regal Shown; Others Similar)
Courtesy of GENERAL MOTORS COMPANY