the pulley wheel fell off while i was driving and all of the pulleys turn except the two under the water pump pulley. does anyone know if that is supposed to spin by hand or will it only spin when the car is running?
Your water pump should definately be able to be spun by hand. Generally when a water pump goes, or starts to go, it will leak antifreeze and or you will be able to shake the pulley slightly. Double check and try to spin the water pump again without any belt tension on it. A water pump can go at any time however, if your car has less than like 80,000 miles on it, it's probably fine.
Is it a big pulley down there? I'm thinking its the crankshaft pulley. That one won't turn by hand. Very difficult. What kind of car? Is a serpentine belt which one belt turn everything or multiple belts? A water pump should turn by hand and if its bad it will leak water. But there are time when the pump just goes out. Replace belt
