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.
Coolant has a sweet smell like candy, if your car is leaking coolant or antifreeze, you will notice the sweet smell coming from your engine compartment or inside your vehicle if you heater core has failed. Antifreeze gets very hot and will start to steam, especially if it running down or spraying on a hot engine.