I just think that an exchanger that is SO dirty as to cause a noticeable air flow reduction, would also smell when hot. I doubt this (dirt) would cause a flow restriction, but it depends on the design.
If you have good flow in registers close to the furnace, I'd be looking for either a closed damper and/or a foreign object in the duct.
Is this a rental? And/or is there a possibility someone opened a register and stuffed something in?
Not a rental.
We lived here for 15 years or so.
We own the home.
I gotta think this has to do with what I said in my first post ... a couple weeks ago, the flow was restricted big time ... upon looking at the filter, it was very dirty and blocked the air from moving in. Upon changing it, the situation improved a lot. I gotta think that while the air was being restricted, the system took air - AND DIRT - from inside and around the furnace, and something got blocked.
Going to HomeDepot to buy some socket wrenches, so I can remove the housing/blower/motor.
Lord, help me ...
I am thinking to check the heat exchanger for blockage, as well as the condenser coil.
I will eventually have my friend come over and check it properly.
In the meantime, I will try to fix it myself if at all possible, hopefully without doing any damage to the system.
Thanks so much for your help!