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It has a delay built in. It will not turn on until the engine has warmed up to at least 100 degrees. The computer is also calculating engine load and puts a delay on the compressor until it has the idle set properly.
Sounds to me like you have a broken vacumn line....check the condition of all the vacumn lines around the top of the engine. Being rubber, they tend to dry out over thime and crack or break off due to vibration.
sometimes when warming up motor the oil doesnt reach up there right away so eventually oil reaches causing clatter to stop a lot of vehicles do it even new ones just make sure you have the proper weight of oil in the motor if car has high mileage..this will help with noise
Turn your key on for 10 seconds but do not start the engine. That will give the fuel pump time to built pressure. After the 10 seconds try starting the engine. If it starts right away you may have a weak pump or dirty filter.