Burnt Oil Smell

We have a 2000 Dodge Caravan a lot of miles but it runs great. About 4 weeks ago it developed this strong odor when turning on the blower. Doesn’t matter if the heater or a/c is on or if the car has been running very long. It starts out strong but is always there. The smell is like burnt cooking oil.

Been to the mechanics and they tried an odor killer but it just seemed to mask the terrible odor. It burns our throats and makes our eyes burn too.