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You can do some preliminary checks yourself.
First with the engine running and a/c on max check to see if the clutch on the compressor is engaged and the compressor is turning, next if it is feel the a/c lines one should be cold the other hot if that is good check the cabin air filter if it’s plugged then air can not move across the evaporator and won’t cool much, or are the lines freezing up with ice? Could be a stuck expansion valve which would require service . If all that checks out ok check if your cooling fan for the condenser is working
Because if it’s not working then the high pressure switch will not allow the compressor to run, and check the condenser for obstructions that will hinder its ability to cool, you can test this by touching the lines going into and out of the condenser the inlet should be hot and the outlet will be much cooler
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