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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.
If the pulley on the compressor will not turn freely, then yes if a bypass pulley exists you would need to use it in place of the compressor. If the compressor pulley turns but the compressor is locked up, just unplug the compressor clutch.
It sounds to me like your compressor has seized up. One way to find out is to start the engine and see if the compressor is turning or not. The smoking may be from the belt rubbing on the frozen a/c compessor pulley. You will need in any case to have a good shop look at it for you. If this is not an option and the compressor is seized in which case it is bad, you may decide to buy a belt for the car that bypasses the a/c. If you decide to do this, simply by a belt for the car that came without the A/c option. After installing it though MAKE SURE the belt does not rub the commpressor as the engine compartment is tight.
the defrosters run with the ac compressor running whenever its 49 degrees and higher. it does that to get rid of humidity faster. the pulley works off the ac clutch behind the pulley so you have a locked up clutch. find a belt to fit by bypassing the ac compressor will do if you like
yeah its seized up[ and they dont make a repair kit for that one either. they have at most auto parts stores an ac bypass pulley . its a bracket and pulley so you can bypass the factory ac unit and still run the factory belt. but if you decide to change the ac unit there are 5 bolts holding the unit down .have the system evacuated.loosen belt and drop down out of your way. take the ac lines off the compressor and set aside . there are two bolts on top in front and there are 3 bolts in back on top tieing together a triangle shape mounting plate , take all 5 loose and out.disconnect ac wires (snap clip) lift , lightly pry off old ac unit.set aside and reverse the procedure to install your new or salvage yard ac unit. refrigerant chargers can be purchased from wall mart ( there cheaper) at $30. roughly 2 1/2 cans will completely fill the system just follow on label instructions. its all easy to do if you can use wrenches and have a little knowledge. and you get the satisfaction of doing it yourself. and save a bunch of $ along the way.