Anyone know what would be making a clicking noise behind the glove box by the relay housing. Every time I start and shut off my truck, there is a loud clicking noise that comes from the relay box. What is making this noise.

Relays normally click if it is overly noisy take a long screwdriver and put it on a relay and listen. Have your wife start it for you. I think one of them is going bad or has a loose ground.

i have the same problem. open the passenger side door, behind the heater core near the floorboard is the flap that opens to allow the ambient air into the cab. its in that black box behind the heater core near the fire wall, hold ur finger against the bottom of it. i dont know how to make it go away yet, but it is right there darnet lol. if u find out how to fix this let me know :)