WyD

Over the last 5 days I have noticed that my 2011 F150 had a loud fan noise coming from the engine every time I start my truck up. This only happens when I start my truck up when either the heat/AC is turned on and when I start my truck with heat/AC off it's as quiet as it used to be. When I use my heat/AC I notice that this fan noise kicks on about 5 seconds after start up and it will not shut off. Also this morning my heater wasn't blowing warm air like it was just yesterday. I don't think it has anything to do with the heat outside, it's spring in Alaska and temps are usually mid 40's at night and mid 50's-60's during the day. Any ideas as to what this could be, any and all suggestions appreciated, thanks.