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Hi, My name is Jay
The engine needs to be running and a/c turned on the check to see if the compressor clutch is getting power on the grey with white stripe wire at compressor.
Have you had the computer scanned to check to see if the computer is getting a/c on demand and output to a/c clutch relay commanded on?
I cannot vouch for the Firestones mechanics ability or expertise and this may be why they did not mention anything I said. If the wire is cut or rubbed through then it may have been shorting and causing the clutch to not engage. Does it look like it is cut or rubbed the covering until the wire is exposed?
Then you should recover wire and then cover harness with a wire protector and then retest system to see if it works.
You may have blown fuse number 11 in the fuse box under left side of dash since it powers the compressor.
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