Recently, our 2006 E350 sometimes takes 10-20 minutes before any air will start blowing in the car even though the temp gauge shows the engine is fully warmed up. Without air blowing the car gets humid and stuffy inside.
This seems most likely to happen when the outside temperature is around 60 degrees; if it's lots hotter or colder, the heat or a/c comes on fine. I don't remember it acting this way before.
I took it to the dealer and they looked at the codes, found nothing wrong, and said all was well.
Any ideas what might cause this?