Try to replace only bearing #6203 2Z inside of pulley.
Yes, if the belt tension is not tight enough it won't spin the radiator fan due to slippage. Replace the tensioner pulley.
You can, for about 10% of the price of a new pulley, but you need a bearing press or hydraulic press to do it properly. A new metal pulley usually costs around $30, but the bearing can be obtained for $3 to $4.
Loosen bolt in tension pulley, then loosen tension bolt. Replace belt. Tighten tension bolt. Last, tighten bolt through pulley.
You cant. Them come with a automatic belt tensioner and if the belt breaks, you must disassemble the whole pulley system.
Look at the radiator fan, behind it you should see a pulley. The pulley is connected to the water pump. The center pulley is attached to the water pump. It is not a hard pump to replace, just a pain in the rear to do so. Y-THINK-Y
loosen the pulley bolt slightly and then an upward facing bolt on the bracket will lower or raise the pulley.
The tension pulley should have a bolt that holds it on, allowing you to replace the unit.
The idler pulley is located just under the A/C compressor. There is a bolts in the middle of the pulley that needs to be removed and the idler pulley can be removed. Sometimes these bolts stick and my need to be pryed off. You may also want to removed the radiator fans cow to give you some extra room.
Remove the old, damaged idler pulley and replace it with a new one.
replace the pump
Might try putting an air gun on the crank pulley nut but not recommended. Best to replace the starter motor and do it right