This sounds like too much oil is the system or the compressor is starting to come apart and the seals are starting to plug up the orifice tube. I would vacuum the system down and open it up to check the oil and other contaminants. The seals will cause little grey pieces.
Here is a guide that will help:
https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
Insufficient refrigerant charge: A low refrigerant level can cause the high-pressure side to climb too high, triggering the pressure switch to shut off the compressor. As the system runs and the refrigerant circulates, it may reach a sufficient level, allowing the compressor to run normally after some time. Ensure that the refrigerant level is correctly charged according to the manufacturer's specifications.
Restrictions or blockages in the system: Any obstructions in the refrigerant lines or components, such as a clogged expansion valve or a restricted orifice tube, can lead to abnormal pressure buildup and cause the compressor to cycle on and off. Inspect the system for any blockages or restrictions and clean or replace the affected components as necessary.
Faulty pressure switch: The pressure switch may be malfunctioning and shutting off the compressor prematurely. A faulty pressure switch can give false readings and cause cycling issues. Consider testing or replacing the pressure switch to rule out this possibility.
Cooling fan operation: The drop in RPM and subsequent compressor shut off when the fan turns on suggests that the engine cooling fan may not be functioning properly. The fan is essential for maintaining appropriate temperatures in the condenser, and if it fails to operate or operates intermittently, it can lead to excessive high-side pressures and compressor cycling. Verify that the cooling fan is operational and check its associated relays and wiring.
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Thursday, May 25th, 2023 AT 9:10 AM