Loud POP after Starting.

[bryceba]

Hey guys, I have had a problem recently with a loud popping noise after I start my truck. This only happens after the truck has fully cooled down (most of the time thats overnight for me) and then I start it. The truck starts fine and has no problems getting started but then after I sit there for maybe 15-30 seconds there is a pop. It almost has the same tone as when occasionally the 4 wheel drive pops when disengaging but not as severe meaning I cant feel it in the seat. This pop happens regardless of if I am in park, drive, reverse, etc. I cant think of what this may be and again, it doesnt happen when the truck is warm and I start it. Any ideas?

[bryceba]

anyone??? no one??

[mbahr22250]

Ummmm. Air conditioning compressor?? Maybe?? Try starting it with the climate control off.

[symbols]

Mine does the same thing. I think it's my blend door but I've never narrowed it down or even really tried.

[bryceba]

I just tried and it still does it with the air controls off. No pulley squeal when I start either so I dont think its anything that has a pulley and is stuck

[jlarsen]

Mine does it as well sometimes. I have no clue. kind of sounds like a little thump

[Powerstroke W/smoke]

mine does that too sometimes...It always makes me think that something is wrong though..but then again i'm pretty much a hypochondriac when it comes to my vehicles