How do you fix a clicking sound when heater is in off position. on 2008 Kia Sportage

I bought a Used 2008 Kia Sportage from the dealership two weeks ago. Now there is a loud clicking sound when the heater is in the off position or when set to defrost. If I turn the dial to the left the clicking stops. I was told this would be at least a 10hr fix plus replacement parts.They said the position of the heater valve is not closing or getting stuck. Has anyone had this problem, if so how much did it cost to fix?

Asked by for the 2008 Kia Sportage
I don't agree that 10 hour job at all but sounds like problem with blenddoor actuator. Have you tried disconnecting your battery? Do this if you haven't and let everything reset. You never know- give it a shot.