AC forty five second delay

Two problems: Recently replaced evaporator coil on car. AC now works great. However, since getting it fixed, when I turn on the car after it has been off for a while, it takes forty five seconds for the AC to turn on. The controls on AC panel will not work at all during this time. When it does turn on after forty five seconds it always sets the temperature at seventy five degrees and all controls are workable. Now if I turn the car off and get back in with in I say fifteen minutes, this problem does not occur. The AC starts right away. However if the car sits for an hour then you have to wait the forty five seconds for the car AC to turn itself on.

Second problem since having the evaporator coil fixed. When I turn off the car, a strange sound comes from the center of the dash where all the electronics are like the A/C and CD player. It sounds like the CD player is changing disc even though their are no disc in the player. I also put a CD in to see if it played and it does. The sound continues for several minutes. Please help. I am not sure if these problems are the result of the mechanics who fixed my car, as I have never had these issues before. And because they did not put the dash/console back together right the first time, I did have some gear issues hanging up, but that has been fixed, once I told them what it was. Thank you for your help.