See also:

Footnotes — Maintenance Schedule Additional Required Services — Normal
a) Or every two years, whichever comes first. More frequent replacement may be needed if the vehicle is driven in areas with heavy traffic, areas with poor air quality, or areas with high dust levels. ...

Introduction
The names, logos, emblems, slogans, vehicle model names, and vehicle body designs appearing in this manual including, but not limited to, GM, the GM logo, GMC, the GMC Truck Emblem, and SIERRA are ...

Climate Control Systems (with Air Conditioning)
With this system the heating, cooling, and ventilation can be controlled. A. Fan Control B. Temperature Control C. Air Delivery Mode Control D. Air Conditioning E. Outside Air F. Recirculation ...