I have read enough posts to be reasonably certain that the random clicking noise behind my dash is probably caused by a faulty actuator. It does it randomly, for varying lengths of time, even with the truck shut off and the key removed. I read that this could cost upwards of $1000 to have fixed. I am not about to pay that kind of money to have a cheap part replaced in a 16 year old truck. My questions are (1) what does this actuator control and (2) how can i disable it and what will be the result if it is disabled? It would help to know what it looks like too.