The ball that rotates, to adjust the temp (heat and/or ac), does not produce an immediate result. For example, if I turn the heat down, it takes 3 or 4 minutes for the change to take place. The heater will keep blowing hot until, a while later, the heat is reduced. The same is true with the ac. Any change made with the temp control will not start for 5 minutes. Any ideas?

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Jacob Wissler Jr., Houston, Texas, 1984 300 SD