Sounds like the bearing is seized on the lower pulley. Remove the pulley and check the bearing. . John In Montana
If you are trying to move the the bottom pulley without a socket it is not easily done ! this is the crankshaft pulley and is connected to the cam by the timing belt ! turning this pulley is in turn trying to turn the whole engine over against the compression of the cylinders ! If your engine is still assembled you can put a socket on the bolt and should be able to turn it with some effort !! if there was an engine problem that brought you to this point , and the engine will not turn over with the socket (or only goes part way) you may have a busted timing belt or a more severe problem internally ! Good Luck !
The lower front pulley should be your a/c compressor. If it is not engaging or cycling you may have to charge with freon. Or the compressor is locked up. Is the belt squeeling? You can bypass the compresssor with a shorter belt to get you by.
This pulley is the A/C Compressor - It is common for the compressor to seize up. However, be sure you're looking at the pulley and not the clutch on the outside of the pulley - It will only turn when the Compressor Clutch is engaged. If the Compressor IS locked up, you're serpentine belt will need to be replaced also. The A/C system will need to be drained before the compressor can we removed.
On the tension pulley above the AC unit there is a tension bolt behind the pulley. Loosen the front nut on the front of the pulley then loosen the long bolt to drop the pulley until the belt fits. Tighten the long back bolt until the belt is tight ( see manf. recommendations on torque ) then tighten the bolt on the front of the pulley.
ALL harmonic balancers for ALL American car engines (and all other vehicle engines that I know of) are in the same place. They're integral to the front engine pulley that drives the serpentine belt or fan-belt, whichever your engine has. Yours has a serpentine belt. Some shops call it the "harmonic balancer", others call it the "harmonic balancer pulley", still others just call it the "front pulley". It's the same thing.
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