1994 Chevrolet Astro Owner's Manual - Page 134

BI-LEV A/C: With this, outside air comes out throughthe heater floor vent and the instrument panel vents. you move your temperature control If lever between cold andhot, cooler air will come out of the upper vents while warmer air comes out of the floor vent.This setting is useful in cool weather with bright sunlight. NORM A/C: This setting cools the outside air. If you first used MAX A/C, use NORM A/C as soon as thevehicle has cooleddown, so outside air will be going through your vehicle. MAX A/C: This cools the air the fastest. Move the other lever all theway to Cold. MAX A/C lets in only a little air from the outside. You can use MAX A/C at first when it's really hot outside and you need to cool off quickly. When the air conditioning, defrost or Blend is on, you may notice a slight increase or decrease in engine speed, due to compressor operation. Rear Heater You may have the optional rear heater. The three speed fan switch is above the radio. Slide the lever toward HI for warmer air in the rear area. Move the switchto OFF to turn the system off. Rear Air Conditioning You may have rear air conditioning. The rear air conditioning switch is located above the radio at the top of the instrument panel. Slide the lever toward HI for cooler air in the rear area. Slide the lever to OFF to turn the system off. 3-6