I have air ride also on an '03 and it is always clicking on and off at a stop light or drive thru and that is normal. As we all know when the truck is not running there is no pump, so my uneducated guess it has to be a leak somewhere in the pillows or line, because when the truck is running the pump keeps them inflated so it has to be a SMALL leak, leaking when the truck is off. Check the most obvious first. Thank you and good night sir!
