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 sewage is likely caused by bacteria in your drain producing gases that arise when the faucet is turned on. Hydrogen sulfide is the gas most likely to cause this smell. It is commonly caused by bacteria that forms in your hot water heater when it is run at low temperatures or turned off for a period of time. Hydrogen sulfide can be smelled at levels as low as .5 parts per million.