MODEL IDENTIFICATION
| Model | Designation |
|---|---|
| Astro & Safari | "L" & "M" Series |
| "C" & "K" Pickup, Escalade, Sierra (Old), Suburban, Tahoe & Yukon | "C" & "K" Series |
| Blazer, Envoy, Jimmy, S-10 Pickup & Sonoma | "S" & "T" Series |
| Express & Savana | "G" Series |
| Sierra (New), Silverado | Sierra, Silverado |
GENERAL MOTORS SERIES DESIGNATION
Note. Escalade, Pickup, Sierra (Old), Suburban, Tahoe and Yukon models are referred to as "C" & "K" series while the Sierra (New) and Silverado are referred to by model name.
DESCRIPTION
| WARNING | To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY article in GENERAL INFORMATION. |
System blends heated air with cooler outside air to obtain desired temperature. Major components of the system are blower motor, air inlet assembly, heater air distributor assembly, and heater control panel.
On "L", "M", "S" and "T" series, temperature control door is controlled by an electric actuator motor.
On all models except "C" and "K" series, vacuum actuators control mode valves to regulate flow of air through heater unit. On "C" and "K" series, mode valves are controlled by a cable mechanism.