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.
Propane itself doesn't have an odor. What you smell is an additive that helps identify leaks. If your fireplace is working properly, the smell would indicate your tank is running low because the concentration of the odor additive being sent into the burner is higher. If the tank isn't low, you may have a leak somewhere.