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Hi, That sounds like your resistor block/controller is already shorted to hi fan speed. Replace the resistor controller, located behind the glove box compartment, on the heater & A/C blower box. You can't miss it, it has 3 wirings and a connector.
Some of these vehicles have a false petcock. Pop off the lower hose over a catch pan, pour a gallon of water in the plastic Dexcool Coolant bottle and put the hose back on when it stops pouring out. Fill to the max line and run the car until both radiator hoses are hot (thermostat has opened). Replenish fluid to max line and cap the bottle. If you have electric fans make sure they come on and make sure your temp. gauge stays in the middle. It'll take longer on cooler days. You might have to get in the car and gas it to about 2000 rpms. Don't cap the bottle until the thermostat opens. If it vomits, change the thermostat and again make sure the electric fans kick on or the clutch fan speeds up at about 210 degrees.
My 2000 Yukon XL with 5300 engine had same problem at 115,800 miles in Aug 2006(I bought the vehicle new January 2000)...My GMC dealer did diagnostic and replaced a faulty 4WD Transfer Case Shift Control. (reading from the service invoice) It was GM part number 15709327. Cost for the repair was $41.48 + labor $74.13, total was $115.71...it now has 165,000 on it and so far no problem and the 4WD works when I need it.
turn the key to the run position engine off, push the gas pedal all the way to the floor then release it 3 times within 5 seconds, the DIC will say oil life reset.
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