Hey everyone, i have been struggling with my climate control panel ever since i got my truck, but the heater somewhat worked so over the winter i didnt bother with getting the ac to work...anyway the truck is a 95 gmc sierra 1500, and when i got it the panel didnt work at all, so i bought a new climate control unit and installed it and it only works sometimes and when it does the first 3 clicks of the heater work and the last one doesnt, and only the defrost setting works none of the other ones do. I hear that the resistor is a common problem and i will replace this but is there anything else that would be the problem? Also, the ac pump is currently out of the truck, would that affect anything? thanks