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If the car has auto heat there's a weird little fan assembly behind the ashtray with a foot long piece of clear pvc hose connected to the small round vent to the right of the steering column. It seems like it runs all the time as it sucks air in through the little round vent in the dash and
I guess it blows a little interior air across a small thermostat to control the old auto heat unit... if it still works.
Smart people yank that silly old pla$tic garbage and backdate to the old mechanical lever system to pull the diverter cables that worked simple and perfect.
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