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Chevrolet impala 2008 The A/C stops working when dash temp shows -38 for an outside temp (in the information screen with the mileage and compass). Once the cars starts to move eventually the current Temp will be accurate for 2 or 6 engine starts, then back to showing a negative Temperature for outside. Is this a problem with Thermostat or a digital thermometer in the engine or a software setting? What is causing this?
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CALIBRATION COMPLETE
Refer to Electronic Compass Calibration do you have an owners manual ?
Compass Calibration
The compass direction will show CAL if it needs to be calibrated. Before calibrating the compass, drive the vehicle to an area that is magnetically clean (free of large metallic objects).
Turn ON the ignition.
Before calibrating the compass, make sure the compass is set to the variance zone in which the vehicle is travelling. See Compass Magnetic Variation Adjustment below.
Press the vehicle information button until the PRESS TO CALIBRATE COMPASS screen is displayed.
Press the set/reset button to start the compass calibration.
The DIC will display CALIBRATING: DRIVE IN CIRCLES. Drive the vehicle in circles at less than 8 km/h (5 mph) to complete the calibration. The DIC will display CALIBRATION COMPLETE when the calibration is complete.
There are two fuses one in the right I/P junction block an one in the left I/P junction block ! The right is marked DK / RKE 10amp fuse. The left is marked A/C / CRUSE 10amp fuse ! I don't think these are the problem ! These fuses supply power to the microprocessor in the driver information center . According to my service information the microprocessor supply's power to the ambient air temperature sensor an to the compass.
This mode displays an 8 point compass heading on the left hand side of the DIC. The compass will display the current vehicle direction relative to one of 8 compass headings using N, NE, E, SE, S, SW, W, and NW for the readout. The ambient temperature displays on the right hand side of the DIC. If the ambient temperature is below 3?°C (37?°F), the temperature reading will toggle between displaying the outside temperature and the word ICE for two minutes. If the temperature is less than minus 40?°F for more than 2 seconds, OC will display. If the temperature is above 140?°F for more than 2 seconds, SC will be displayed. If OC or SC is displayed DTC's will be set. For compass calibration and compass magnetic variation adjustment refer to Electronic Compass Calibration .
Check the connector that plugs into the back of the mirror and make sure it is pushed in all the way. If that is not it, look carefully at the wires going into the connector. I had one that broke off. I had to pull the pin out of the connector and re crimp it onto the wire.
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