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.
i have a couple propane heaters,they do smell when you first fire them.they burn off some oil and dirt ,then no problem. i think what may be happening is the primer your using [i'm guessing a oil base] is puttting off some fumes and then is going through the heater and burning ,which is making the smell.