This is considered normal system operation. When the vehicle is parked for extended periods, liquid refrigerant can migrate into the compressor. It may take up to 2 minutes to displace the liquid refrigerant from the compressor before starting normal operation.
Over time liquid refrigerant can drain back into the compressor when the vehicle is parked. If the A/C system were to function at 100% right from startup the compressor would be damaged. The system is then started up gradually to prevent this from happening and extending the life of the compressor. Normally the system is functioning at 100% after 30-60 seconds, but in extreme conditions it may take up to 2 minutes for the system to function at 100%.
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