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Problem is likely to be the control panel that is faulty. If your vehicle is equipped with Auto HAVC, try to get into diagnostic mode to see if there are any fault codes stored.
Here are the procedures. Perform the test and see if any error codes are stored.
1. Turn ignition switch to ON position. Set temperature control dial to maximum cooling, then slowly to maximum hot. After one minute, press AUTO and then the OFF button. Simultaneously press AUTO and OFF buttons.
2. If any problem exists in the system when the buttons are depressed, the temperature indicator will light up the segment corresponding to the error code. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the diagnostic trouble code segment. See Fig. 7 . If system is okay, segments will not light up.
Fault information is not retained in memory. In case of multiple problems, appropriate indicator lights will light up. If indicator lights "A","C","E","G","I" and "L" light up at same time, common ground for sensors may be open.
Perform the above and let me know what you find.
Wednesday, June 24th, 2009 AT 8:45 AM