Hi, I'm looking for offers on this NOS Pulley. I believe and I think I paid around $100. I also have some other Motorcraft parts for a tune up, and a timing belt tensioner. I can supply more info and pictures of other parts if interested. USPS flat rate shipping at cost. (whatever that is now...
If it happens when you turn on the air conditioning fan it could be your blend door actuator. Part is around $30, and it can be done at home. its a bit of a hassle getting to it, but doable. Youtube has videos too. Good luck!
I'm thinking of selling mine, I'll have pictures posted soon. I'm in Southern CA and have a nice 2008 XLT 6 cylinder 2WD. Metallic Blue, tan cloth interior. Runs good and is in good shape.