turning the fan just turns the water pump, unless you can hold the belt tight enough to turn the bottom pulley attached to the end of the crank - only possible with all the plugs out, and maybe not then .... you need to either drop the splash pan below the clutch or pull the starter, and use the teeth on the flywheel with a pry bar to really check if it's siezed or not
if it appears siezed, it may be possible to free it up, just depends on why it's stuck, but you could start with some thin lube in the plug holes, like penetrant or diesel, soak it good for a couple days and try again
Bill
