Just in case you haven't tried to get to anything yet, assuming the unit to be an ordinary Heil vertical updraft furnace, the fan that you hear and the hose that you need to get to are behind the upper louvered access panel that you're staring at when you approach the heater. Lift up about a half inch and the panel should come off. Don't play with the solid panel beneath it unless you have to. That panel must be reinstalled correctly or the main safety switch will lock out and nada will run. :no heat smiley:
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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