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anti freeze has nothing to do with air conditioning
shaking at speed is , tires, wheel alignment, suspension parts or balance and again is not related to air conditioning
working one day and not the next suggest a leak in the ac system and now the low pressure switch is not allowing the compressor to work
So to cover your problems
take the car to an accredited auto ac specialist shop and have it checked for leaks and gas
then take it to an accredited suspension for a thorough check of the front end , then have a wheel alignment done
Does the compressor run ? If yes, you would need to know what the high and low pressure readings are to proceed. It could be a blend door problem under the dash, or something else.
has to either be a leak or compressor not working theres a 2 prong wire on the condensor unplug it stick a paper clip in both holes of wire to complete the circut see if compressor kicks on
Is the compressor engaging? If not he needs to find if a sensor issue if its fully charged or a low pressure or refrigerant condition. You can have pressure without refrigerant.
your condensor fins could be blocked by leaves or other debris on the outside. this component is located right behind the radiator. there could also be an overcharge or under charge in the system. make sure that when you charged the system that you used a good set of gauges to check the system pressures. Also check and make sure that there is not a blockage somewhere in the lines, Usually if there is there is a fine layer of ice surrounding it.
Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.
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