High pitched squeal from engine

sharpright

Member
Oct 28, 2020
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4.6 2v making a high pitched squeal which I think is coming from the passenger front side pulleys. With the engine turned on I can’t see the bottom left pulley moving at all. I turned the AC on for a short time and it blew cold air. Is the bottom passenger side pulley the AC pulley? I don’t understand how my belt hasn’t melted or burnt out yet.
 
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I have been reading that when the pulley seizes the metal pieces end up in the AC system. If I replaced the compressor or pulley and left it unplugged is there any harm in driving the car until I can flush out the AC system?