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Q: heater prblem on 1990 Chevrolet Blazer

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First my heat wasnt coming out at all so i figured the fan was not working took fan out got a new one and still nothing so i traced the power wire up to a little metal box with a plastic plug then started moving heater speed from low to high heard a clicking traced it to the metal box just wondering if this box could be the problem i know i am getting power and a good ground and i know my new fan works
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I had the same problem with my 91 blazer last winter. We stopped at a gas station and the engine was smoking, It turned out all i needed was anti-freeze and the heat worked again. Before that i replaced the fan and thermostat. Try checking the anit-freeze cuz i had the same problem
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