that is ot how you test for a cooling fan problem and you should take it to your mechanic so you dont chop off any fingers. Those fans are on a special switch that comes on when the engine reaches a specific temprature. Paul, 38 years ago there was only one fan. Now, a lot of cars actually have two fans.
2) Propane contains an odorant similar to what's put into natural gas. If combustion is not complete, or there are any leaks, then this odorant produces a smell. In addition, in larger tanks typically there is a large tablet of solid odorant sitting in the bottom of the tank.
There could be several reasons why you have a burning smell coming from your heat vents. The answer could be something as simple as burning dust to a faulty heater component. I will discuss these in depth below. The most common reason you might experience a burning smell when you first turn on your heat for the season is that dust has settled on your furnace heat exchanger.