ding freon will make it colder, only if freon is low. if freon is low you have a freon leak so adding will be wasting time and money. more likely to need a new ac temp thermostat, which is no big deal to change
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NO A HI PRESSURE SW IS NOTHING BUT A SAFTEY DEVICE
My first guess would be you are low on freon.
It is a low pressure AC clutch cut out switch. It keeps the compressor from running if the system is low or empty of freon.
An AC compressor compresses the freon and circulates the freon through the system. An air ride compressor pumps compressed air into air bags to level the vehicle and/or alter the handling of the vehicle.
The low pressure switch will do that when the system is low on freon.