AC will work on the defrost set on cool or heat but not in AC mode

So we were having trouble with the oil pressure and they replaced the battery, the cluster panel. We had trouble with the cams in the engine and the engine had to be rebuilt. It was a couple of weeks later the radio started to cut in and out. Took it back to see if wiring was messed up as they used my old wiring harness. They said no. And yes, there is now a clicking when you turn on the AC or heater. Then it got worse and the AC cool or heat started the clicking noise. So we quit using it. I am able to use the heat and air through the defrost button, so I know the AC and heat works just not through the climate button, and radio and disk player is now non fictional. So should I take it back and have them check this connection? Would take to different dealership. As this one had it for four months. Thank you for responding. Kris