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The blades should turn with a little resistance. When it's running do the blades move slower than the engine? When the engine warms up the thermostat in the clutch causes the viscous fluid to move out of the reservoir and spin the fan with engine speed. Check the condition of the fan blades as well. A new clutch can run up around $50 (with a/c). Your best bet would run the Blazer and watch the fan. The sound you described sounds like the fan engaged which could be a failing clutch or the vehicle is just getting that warm. Shouldn't be hard to change either.
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