Hi,
If it is working properly for 20 to 30 minutes and then stops, have you noticed if the compressor clutch stops engaging? Also, does the condenser/cooling fan under the hood stop running?
Since it works and then doesn't, the first thing I'm thinking is a faulty compressor clutch relay. It is located in the under-hood fuse box. See attached schematic below.
Try this. Switch the relay with a different one in the box having the same part number and see if the AC continues to run. If there isn't one, here is a link that explains how to test a relay and circuit:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Let me know what you find.
Take care,
Joe
See pic below.
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Sunday, July 30th, 2023 AT 9:45 PM