How do you release the a/c in your car. I have a 2000 Mazda 626. My pressure is way to high and I need to dr?

How do you release the a/c in your car. I have a 2000 Mazda 626. My pressure is way to high and I need to drain it out.|||on any newer car with air conditioning there are 2 pressure release valves, a high pressure one, and a low pressure one that is used to add more a/c coolant to the system when needed. If the pressure is to high the high pressure valve should automatically release some so i wouldnt worry about it.