I am new to this site and I was hoping someone can help with an issue I am having. I have tried to research it here but no luck. I have a 2000 Chevy Z71 and I am having some heat/ac controls problem. It started off when I would hit a bump the controls would shut off like it lost power. The fans would cut off and the lights in the controls unit as well. I could hit the dash and it would come back on. But it got to the point that they would even cut off sitting still. Now they have gone off completely. The weird thing is that when the controls lose power my passenger said window does not work either. It will click but not move. I have look behind the controls and I can't find anything loose. I would just buy another controls unit but I would like to get some in put on it first. Any ideas and help would be great.