2002 Sante Fe heater/AC problem
 

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 not
blow 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.