I have a 2008 Elantra Sedan Limited. The far right control knob for the direction of airflow does not work anymore. A few months back int would make a short strange noise when switching from the feet or head to defrost, etc. Then is stopped working last month and now it only blows air to the head area. Is there a cheap way to fix this? My brother who is a parts manager at a Ford dealer says it is most likely a faulty switch inside and a dealer only item that costs 630 bucks. Any ideas? Thank you.