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Two separate issues. The rattle noise you hear are the heat shields. The rear cat shields are prone to cause this type of rattle. You will need to replace them to correct the problem.
The ac could have a leak causing the freon to go low, this will prevent the compressor from coming on causing the ac not to blow cold. You would need to evac and recharge the system and test to see if system holds a vacuum. They will the recharge and add dye, drive for awhile, then check for leaks with a UV light. Once the leak is located, you can then replace the part and recharge again.
Is your compressor turning when the ac is on? I do not trust the gauges that are on the can. You really need a set of high and low side gauges to diagnose. Are the lines cold leading to the evaporator core?
Hello again Dan here,
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