Why would a central air unit quit working abruptly if it was running fine one day and wouldn't turn on the next and the furnace blower turns on but not the AC?

hello, not ease to answer to your question.1-could be the electrical cluch 2-reley 3-burn the compresor 4-freon leak 5-presure valve I believe you got the picture.I would recomend a check out from prof. A/C mecanic Check your breaker box or the outdoor disconnect. I do not believe it is any of the things mentioned by "A/C mecanic". Start with the simple things first. Make sure the condenser is operating.