Bryant gas furnace 376CAV downflow The blower motor seems to be inoperative - I know everything else works appropriately but the main blower fan doesn't come on and the burners shut down correctly. What is the usual problem? The start capacitor, the whole motor assembly? (I hear a clicking relay come engaged when I throw the manual overide switch for the fan, so I know something related here is the malfunction). Where can I buy the parts at a reasonable price? Thank you.