1998 GMC Savana Van Owner's Manual - Page 142

Air Conditioning Before using your vehicle'sair conditioning, open the windows to clear the vehicle of hot air. This reduces the time it takes for your vehicle cool down. Then keep to your windows closed for the air conditioner to work at its best. You can use MAX AIC with the temperature knobin the blue area when it's really hot outside and you need to cool the inside air quickly.MAX A/C lets in only a little air from the outside. If you first use MAX A/C, you can then use A/C with the temperature knob in the blue area, as soon as the vehicle has cooled down, so outside air will be going through your vehicle. If your vehicle has rear air conditioning, setting it on LO may enhance front A/C performance by allowing trapped refrigerant in rear lines to circulate. When the air conditioning, DEFROST or BLEND is on, you may notice a slight increase or decrease in engine speed, due to compressor operation. This is normal because the system is designed to cycle the compressor on and off to keep the desired temperature. Heating On cold days, use HEATER with the temperature knob in the red area. Outside air will be brought in through the floor outlets. The heater works bestif you keep your windows closed while usingit. If you use the optionalengine coolant heater before starting your engine, your heating system will produce warmer air faster to heat the passenger compartment in cold weather. See "Engine Coolant Heater" in the Index. Ventilation Tips 0 Keep the hood and front inlet free of ice, snow, or air any other obstruction (suchas leaves). The heater and defroster will workfar better, reducing the chance of fogging the inside of your windows. When you enter a vehicle in cold weather, turn the blower fan to HI for a few moments before driving off. This helps clear the intake ducts of snow and moisture, and reducesthe chance of fogging the inside of your windows. 0 0 Keep the air path under the front seats clear of objects This helps air to circulate throughout your vehicle. Your vehicle has air vents in the center and on the sides of your instrument panel. 3-6