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Re: 2001 nissan centra air conditioner
You may have a leak. At higher rpm's a/c compressor works better, that at idle, because it turns alot faster. Your level of R134 may be low in a/c system. Have garage check, how much R134 a you have in there.
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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
Sounds like either low coolant or air in the cooling system. Either you need to bleed air out of cooling system or repair possible leak in system. When there is air in cooling system and it goes into your heater core, heat is not transferred to the air blowing out of your vents.
sounds like at hi speeds the air is blowing over the intake below the wipers. because the shape of your hood it makes the air go over the intake. check your cabin airfilter, it may be clogged. if it has one it will be behind the glove box
It sounds like your Mass Air Flow Sensor is faulty. These sensors will normal show fault when cruising at highway speeds causing the vehicle to almost stall or stall. Replace the Mass Air Flow Sensor with a known good one and test drive the vehicle. This will most likely repair your concern.