Does the fan come on when you turn on the A/C? If not, the fan is probably faulty. If the fan runs with the A/C, but not when the coolant gets hot, then the fan temp switch is probably faulty.
sounds like a blown head gasket. if it lacks power, misfires or perculates in the overflow jug (sounds like a coffee maker brewing) after it reaches operating temp when you cut the vehicle off,then its a blown cylinder head gasket.
Usually you have to take a pulley puller kit and just pull the pulley off the shaft. Installation is reverse, you use a threaded stud in the shaft to pull the pulley on with.