Does the system need presure to activate the compresor
Yes, freon must be present in the system in order to circulate the oil that lubricates your compressor. A low pressure switch is used to stop the compressor from running if the freon level/pressure is low. This is to keep your compressor from destroying itself due to lack of lubrication.
There are also several other reasons that an A/C compressor will not engage. Proper diagnosis is required.
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