Added R-134A to AC. Now just blowing hot air???

They did check the relay and it was functional. Did that first.

What's that mean? They pulled it out of the car and tested it on the bench? They swapped it with another one and the compressor still didn't work? They swapped it with the horn relay (if they're the same) and the horn worked?
 
gauge when attached to the lower port was in the middle of the green

The green on those cans is a broad range for many scenarios, which covers different ambient conditions that doesn't correlate back to the gauge..so that needle reading can vary from vehicle to vehicle.

Going to the higher end of the green doesn't mean you will have colder AC.

Your vehicle's AC system is designed to run on a set amount of freon, you get the cold air from the evaporation of the freon, not from more freon.

Like others have stated, take it to a shop, have it evacuated, vacuum drawn, and recharged.
 
On a lot of vehicles if the AC system sets a code in the computer, it disables the AC from coming on. The problem then has to be fixed and the codes cleared for the AC to operate. Probably not your issue but it's something to keep in mind.
 
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