Something strange that's been bothering me for a while, not sure what it means. So far it seems that it's not causing an issue the truck runs good. But, When i have my A/C on i get an intermittent random clicking noise from the ECU area (passenger side kickpanel) like the noise when the truck's going to die or something. It never dies and does it at random even when on the freeway at high rpms. It doesn't change the way the truck runs when it happens or anything but it is distinctively there and happens all the time only when the a/c is on however.

some sort of a/c relay going out possibly?