Air Conditioning - HELP!! DESPERATE

My 2010 Mustang GT has had new blendor, radiator fan, compressor + kit installed. AC runs great for 20 mins then no more cold. Mechanic says compressor not kicking in. Please don’t say Freon or faulty parts. All checked and rechecked. Mechanics are stumped. What could it be???? PLEASE HELP!!!
 
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Where are you and how humid is it? Could be freezing moisture on heat exchanger which will defeat the AC. Tryimg sneaking up on the cold when you turm it on - a few minutes low - a few more mid etc.
 
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