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.
The smell of gasoline is easier to get rid of than the smell of kerosene. Just keep ventilating the shop, and the smell will disappear. Gasoline is a mixture of light and heavier components with differing vapor pressures, and the light ends will first evaporate, making the most odor. The heavier ends take longer.