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1987 with or wihtout heat

Heating and Ventilation

Vehicle Information: Year: 1987; Engine (Size, Modifications): 3.3 turbo; Total Mileage: 67,000;

When I turn the auto heat selector to the red zone I get heat at once (If the engine is warm), but then it cycles off and won't come back on. If I go to the highest number it comes on and stays on high(Bake).I never hear the foot well blowers come on so I don't know if they work. I've checked the flaper valves and they open and close norm. Any ideas? Also, do the blowers on the dash control panel work with the heat?

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