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The air compressor will not turn over/engage if the coolant charge is below a minimum level. It may be that you have a very minimal leak (somewhere) and that all you'll need is a charge. The tech will be able to develop a fix plan once they pressurize the system.
I had a no air problem...it was one of the two hoses in the engine bay. The hoses are $300+, and labor. If it is the evaporator core, buried behind the gas tank, the standard quote is 10 hours of labor + about $400 for the part, figure $1,400 or so for the job.
You may get lucky and the fix could be minimal! I believe the horn has a separate fuse...but I am certain it is not linked to the air conditioner compressor.
look for horses, not zebras*! It may be something very simple...you already know the worst case. Note, a moderately accurate presumptive diagnosis can be obtained if the tech looks/feels down where the evaporator is located and determines if it is wet or dry. If it is wet, you are probably toast!
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