1997 Chevrolet Astro Owner's Manual - Page 121

Temperature and Compass Display Before you turn on the ignition and move the vehicle, the temperature indicated will be the last outside temperature recorded with the ignition on. If the outside temperature is 37°F (3°C) or lower when you turn on the ignition, ICE will appear on the display. This is a warning to the driver that road conditions may be icy, and that appropriate precautions should be taken. The compass is self-calibrating, so it does not need to be manually set. However, when your vehicle is new, the compass may function erratically. If it does, CAL (Calibration) will appear on the display. To correct the problem, drive slowly in a complete 360" circle three times, and the compass will function normally. Variance is the difference between magnetic north and geographic north. In some areas, the difference between the two can be great enough to cause falsecompass readings. If this happens, follow these instructions to set the variance foryour particular location: The outside air temperature and the compass are displayed at the front of the overhead console. The control switches arelocated to the left of the display. Turn the display on or off by pressing the ON/OFF switch. Display the temperature in either degrees Fahrenheit (English) or Celsius (metric) pressing the by UWMET switch.