Just bought a 05 LT and whenI first start it in the morning, I get a sound from under the dash that sounds like water running. Only lasts a few minutes and is loud when I take off from a stop. Any one have this sound?? Thinking maybe the cooling system needs to be bled.

 

That's exactly what I'd think too. Air in the Cooling System! Not good if you have that Dex-Cool in there; too!!!

 

If my memory serves me correctly, check your coolant level in the radiator and overflow. I had this same noise in my jimmy and turned out to be low coolant. Hope this helps.