1994 Chevrolet Blazer Owner's Manual - Page 139

DEFROST This setting operates the defroster. Most of the air comes out near the windshield, with some goingto the floor vents and side window defrost vents. Use this when you get fog or ice on the windshield. HTR (Heater): Most of the air comes out near the floor. The rest comes out from thedefroster vents under the windshield and at your front side windows. This is best for cold weather. VENT The air comesout at the vents on your instrument panel and at your front side windows. BI-LEV A/C: With this, outside air comes in through the heater floor vent and the instrumentpanel vents. This setting is useful in cool weather with bright sunlight. NORM A/C: This setting cools the outside If you first use MAX, use air. NORM as soon as the vehicle has cooled down, so outside air will be going through your vehicle. MAX A/C: This cools theair the fastest. Move the otherlever all the way to Cold. MAX lets in only a little air from the outside. You can use MAX at first when it's really hot outside and you need to cool off quickly. NOTICE: If vehicle is parked with function lever in MAX A/C position and on an incline with the right side lower than the left, then water may leak into the passenger compartment in an unusually heavy rain. J OFF: The blower is off, but air still will come from outlets at the front of your vehicle. The system will try to keep the air at the chosen temperature. Engine Coolant Heater (Engine Block Heate If you use the optional engine coolant heater before starting your engine, your heating system will produce warmer air faster, to heat the passenger compartment in cold weather. See "EngineCoolant Heater" in the Index. Rear Window Defogger If your vehicle has this option the rear window will have lines running across theglass. These lines heat your window. For best results, clear the window of as much snow or iceas possible first. 3-5