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[QUOTE=NorthernHeat]The main limit looks nothing tike the others (they are commonly called roll-out limits). The main limit is usually a 1.5" x 2" plastic or fiberglass plate with 2 wires going to...

Sorry if I was vague... I have 4 limit switches one on top, bottom, and both sides of the metal box surrounding where the gas and heat comes from (sorry don't know the technical names) they all...

I'm sorry but I don't know what brand of furnace I have.
so here's the problem... a couple of days ago I noticed my furnace was blowing cold air so I went to check to see if the pilot was out......