Hey sup guys, I have a problem with something rather a annoying sound that comes on when my heat is on, and when it comes on, the rpms go up a bit, and it pulls my truck a little, but when i give it gas, it goes away..

Does anyone know what I could be talking about?

 

not sure what it is but i have the same problem with my 01 super crew 4.6L. im going to post the quwstion in the engine section and see if we can get any ideas.