Can the AC pulley and clutch be replaced on Mercury Grand Marquis without removing compressor from car?

Generally, no. While *some* minor repairs might be possible without removing the AC compressor from a Mercury Grand Marquis, replacing the AC pulley and clutch usually requires compressor removal. The clutch is typically attached to the compressor itself, and access to properly install the new components is severely restricted without removing the compressor. Attempting it in place significantly increases the risk of damage to the compressor, surrounding components, or causing refrigerant leaks. It's far safer and more efficient to remove the compressor for this type of repair.