My car only blows hot air and there is a wheezing noise when the fan is on. on 2006 Kia Optima

My air conditioner has gradually lost it's cool over the past couple of weeks. It now only blows hot air and there is a definite loud humming/wheezing sound when the fan is turned on. It goes away once I turn off the fan. I want to sound half way knowledgeable when I take it into the shop so that I don't get charged an arm and a leg. Does this problem sound like one you've experienced before?

Asked by for the 2006 Kia Optima
poss low on freon and something in blower motor fan blades
Thank you for your response. I appreciate your time.
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