I have a Coleman Model #2960E666 forced air propane furnace. I don't know how old of a model this is, but it was installed in 1992. I am trying to replace the hot surface ignitor but I can't figure out how to get to it to replace it. Do I need to remove the blower motor in order to get to it from the bottom? I can see it when I shine a flashlight through the opening where the gas control is located. However, it is way back in there. I can unplug the electric plug to it here, but there is no way I can get a wrench on the nut that is holding it on.