Hey guys, Recently noticed in my wifes 99 5.4 eddie bauer expedition that when the heat is on it blows ice cold air and then after 30 minutes or so it is room temperature air. It never gets hot or even close to warm. Any ideas where to start checking on this? Ive never messed around with heater components in any car before so this is all new to me. Ive red alot that the blend door is an issue in expeditions... would this be a good place to start? Thanks!