Question about 2002 Chevrolet Silverado 2500HD
Changed batteries on my 04 2500 HD diesel pickup now the A/C Heater will only blow out the defrost ducts cant switch to cabin or floor. I disconnected the batteries again thinking it was a programing problem but still does not work. Temperture control on both sides still works correctly.
Some times you can "reset" the computer for that by disconnecting the battery for 15 or 20 seconds then re-connecting it. If that doesn't work then the mode door motor assy might have stripped gears or broken gears. (they are plastic) If you are familiar with where the mode door motor assy is you can turn the knob to change the mode (i.e. defrost, panel, floor) and see if the motor is turning. If motor is turning and mode does not change then the plastic pieces have broke or stripped. Usually when there is a problem with the climate control system it will default to the defrost simply as a safety thing. So you will have defrost so you can see where you are going. Hope this helps you all out, good luck.
Posted on Feb 17, 2009
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