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either you have a bad thermostat or you have a air lock in your heater hoses remember your heater is fed by the hose by the upper rad hose return is the hose going to the water pump, to bleed the air out fill rad leave the rad cap off start engine run for 5 min. the check the coolant level,fill to top of neck replace rad cap tight, K-D tools make a special funnel to solve this air lock problem
You could pull the serpentine belt and run the engine to see if the noise continues. The bearing for one of the pulleys could be failing, including the water pump and alternator. It could also be the fan and fan clutch on the water pump.
autozone usually has a fan clutch loaner tool set, however in a pinch a strap wrench can hold the pulley and then you have room to fit a decent size crescent wrench. In a hurry you can use an air hammer on an edge (of the nut) going counterclockwise, they also make a neat tool that does basically the same thing, might take a few tries but you will get it.
To seperate the fan from the fan clutch there should be four small bolts that keep them together. Not sure thats what you are looking for but if you are trying to seperate the fanclutch from the water pump then you need a special tool to hold the pully from turning with the one hand while turning the fan clutch nut with the other they rent these tools at autozone.Once youve seperated the fan clutch from the water pump then you can take the fan off the clutch by removing the four small bolts.Please rate my assistance in helping you thank you.
Remember, fan has a reverse thread. Righty-tightey, lefty-loosey does not apply. You need a clutch fan wrench. (available at your local auto parts store.)
A special fan tool is required to remove the fan from the water pump. Yes it does unscrew. One part of the tool holds the bolts of the pulley while the other part unscrews the large nut on the water pump. Tool rental is available at some auto parts stores.
I have a 2004 dodge ram 1500 with the same problem, vibrating blow fan when on high, pulled the blower fan out and found a piece of the hinge from the recirculation door and felt the recirculation door sitting up on the vent of its hinge. Crappy engineering once again.
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