[jnaas2]

The capicator you are talking about if its a start capicator it will be light if you remove it, if its a run capicator it will be filled with oil and be heavy for its size, it shoud say somewhere what it is. The one thing that will cause a fan to turn off and on is the fan control its a sguare looking box that also is the high temperature limit and if you take the cover off it will have a circular dial with temperature readings on it. If your furnance is circuit board controled it may be going out. If you can send a wiring diagram it will be easier to answer your question