I have a 01 blazer lt. a couple weeks ago the gauge cluster started messing up. All the gauges and lights start to go nuts on and off. And the AC will shut down and turn back on ( not just the blower the control unit resets). I have replaced the dash in the truck checked all the grounds i can find, also have replaced the ignition switch and still have the same problem. anyone have any ideas. please let me know. thanks