I am having a problem with a strange odor when I turn on the heat or AC. Heat does not flow properly. It alternates with AC. I checked everything else out and don’t know what else to do
Sounds like maybe a little varment might have found a place to nest in the duct work. I have used a scope camera to locate these things. If that turns out what it is, let us know, there’s a few tips here that may be helpful.
In addition to `Tcmichnorth‘s suggestions. Do you have a cabin air filter?