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Automatic climate control uses a temperature sensor to detect cabin temp. I would look at that circuit for the problem, as it may be getting erratic readings from the sensor to the control unit, causes the blower to become confused to the air temperature in the car. You could probably find the entire climate control unit in a salvage yard to swap it out for a low price.
I have the same problem on a 1988 lesaber Climate control and was told to change the climate control as the was the problem. A have the climate control but have a problem to take of the cover that covers the control and the radio. If any one can tell me how to remove it I will put in the new control and see if that will stope the fann.Thanks