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Not being able to turn the engine by hand is not a good sign. It would be odd for the engine to seize out of the blue without prior noises indicating a problem. Possible seized drive pulley ( alternator/AC compressor etc ). Try removing the serpentine belt to rule out a seized pulley. If the engine cranks/starts with the belt removed, suspect a seized accessory pulley
Most likely the clutch on your ac compressor has stopped working or the entire compressor has seized. The blower will still work, but without the clutch working correctly int won't cool like it should. While possible to replace just the clutch on a compressor, it's generally better to replace the entire assembly.
If the compressor is seized, you will know when you turn on the AC, as the belt will shriek like a banshee usually. And yes you can usually just bypass it with a belt for the same model as yours without AC. If there werent any built without AC, you can try another model with the same engine. If all else fails, you can use a small mason's rope to pass through the pulleys without the AC and mesure the length of the rope needed to do so, then count the number of ribs on the original belt. Any good counter parts guy will be able to find you a belt that will fit the measurements as close as possible.
The AC compressor has seized up causing the ac compressor clutch to hold hold the belt while the engine is running. Consider replacing the compressor along with the receiver/dryer and metering valve for good preventative maintenance on you AC.
Is it seizing with the AC on? Or Off? Or both? If it is seizing even with the AC is on and off then this is an internal issue with the compressor, replace the compressor. If it is only doing it while turned on and is still blowing cold air then replace the clutch pulley.
I agree that it's probably seizing up and here's a video I made on how to change the compressor. You also need to change the accumulator and orifice tube when you change the compressor. If the compressor came apart and threw chunks or metal shavings into the system, it's recommended to flush the system but that didn't happen on mine, so I don't show how to do that.
plugs and wires time ! Most likely, as when the engine takes that kind of load (it works much harder when ac is turned on) weak plugs and or wires wont keep the rig running. Imports like yours have a plethora of things that are interconnected... that or your AC condensor - compressor is bad- and when it engages on your engine, (one of the things the serpentine belt is connected to) it CANNOT turn on the inside, and since it is trying to turn your compressor-condensor at the same time as everything else, it just stalls out. If you can live without the ac, you can usually buy a belt that will be shorter for non-ac versions of your car, or it will have a seperate belt all on its own. the compressor-condensor is the peice with all the metal tubes and rubber tubes around it. This will also give you better mileage. Have a nice day!