NO heat and loud roar noise when I accelerate

[jeezy]

Hi,
I have a 2006 explorer and my heat just doesnt work. it blows out cold air. also it makes a very loud noise whenever I accelerate... help?
thanks

 

[ThePhoenix]

sounds like two separate problems, a blend door isuue and an IAC issue

 

[swetrid]

Sounds like it is low on coolant which in turn causes no heat and the fan to operate at full speed. You probably have the common radiator leak.