My Sante Fe has been the best car I have ever owned. I have 138K miles and the only issues I have had have been minor. My current heater/AC problem is intermittent but often the fan does notblow any air. I can change fan speeds, hear the fan speed faster or slower but no air flows. Could it be related to the defrost setting? It will work for 5-30 minutes, then stop working, then start working again. Same with the A/C. My other issue (unrelated to the heater/AC) is I hear a "whoop" sound intermittently but I can not repeat it intentionally. I can not tell where it is coming from since it is always just a very short sound.