Heater/Air conditioner problem

My 86 300 turbo heater/air conditoner controls are some what screwed up. This just started last fall. When you change between A\C and the climate control or heat it continues to blow air in the previous setting for a while before changing. Has any one had this problem and how did they fix it.

its probably wireing or a bad swithch, but id remove the ac altogether thats why there t tops

yah im removing my a/c compresor this weekend and take out the a/c controls