Just as the title says.. I replaced the heater core today and found that it was replaced by the previous owner, which I might add was a complete hack job. After getting the dash back on, I noticed that the top switch goes click. This happens in the up positions and down position. Not really sure what I did wrong. One thing that did happen was that 3 of the 4 wires pulled out of the harness. I 'believe' I have them in correctly. So does anyone have anything to offer? Thanks