Question about Nissan Altima
You do have the compressor On while you are charging the system, right? Since you have 30 psi with the compressor off, and 0 psi with the compressor On, this tells us your compressor is working, and you are nowhere near charged. Keep filling, until your low side gauge indicates full/normal charge. Do
NOT overfill, it won't get cooler. It would get warmer and it will
eventually damage the compressor. If your system was evacuated, you may need anywhere from 3-5 cans of Freon to fill the system, depending on the size of the cans. If your lines are freezing, there may be a restriction. I hope you got all the moisture out before charging, by pulling a strong vacuum in the system. I also hope you didn't release any old freon into the air.
If you are not EPA MVAC Certified, and a standard recharge isn't fixing the problem, I recommend you get an EPA MVAC certified technician to fix your A/C.
Also keep in mind that the only accurate way to charge an auto a/c system is to safely and legally recover and evacuate all the existing gas from the system, then hopefully after a successful leak repair, carefully weigh-in an the exact amount listed on the a/c factory specification label placed under the hood by the factory to assist the service technician, which, again may leak-out if the needed repair is not performed properly.
Posted on Mar 19, 2011
If there is enough freon, then when you turn your switch to the AC position you should be able to look under the hood and see if the AC clutch is spinning.
If there is freon, but the clutch still doesn't spin, then you have a bad /weak AC compressor. ----------------- The clutch on the compressor is controlled by the low and high pressure switches. You will have to check the low switch then the high. The low switch is on the evaporator, which is the long tube looking item by the firewall on the passenger side. It has a plug with two wires on it. If you jumper the connector, it will engage the AC clutch. If that doesn't work than it might be the high switch and that is on the high line connecting to the condenser. Passenger side towards the front of the car.If that is also not making it work, and if the freon is full and its not leaking then its weak/faulty compressor causing this. ------------------ Usually the compressor cycles because the low side pressure drops to low and that cuts off the compressor. Then the pressure on the low side increases and the compressor turns back on, repeat and repeat. AC work by pressurizing the freon which cause it to change state, from liquid to gas which removes heat. If the system doesn't stay within the proper pressure, it turns off. Also, the high or low switches could be bad or the compressor is worn and can't keep the pressure on the high side up enough. If you have 30 lbs. on the low side while the compressor is on, it should stay on. If the air isn't cold at 30 lbs,then you might need a new compressor. If it keeps cycling or going off, you might need a high or low switch. But if it registers 30 psi on low side with compressor off, then its faulty switch or freon is low or leaking.The ac pressure test has to be done. ------------------Check out this possibilities.Keep updated.This should help.Thanks.Helpmech.
Posted on Mar 18, 2011
30 psi with compressor off is to low, and 0 running is way to low, you need to check the high side pressure, but i think you need to have the system discharged and vacuumed down and then recharge with the proper amount of freon, 134A systems are very sensitive to the charge amount there may be nothing wrong other then the charge but until you have the proper charge you can not test anything else in the system......good luck
let mw know if there is any thing else i can do for you.
Posted on Mar 18, 2011
Probably didn't take any
Do you have refrigerant knowledge?
If not, you need a repair shop that does
Not all shops do
All systems with A/C problems have to be
evacuated,repaired for leaks,vacuum tested and
The simple act of adding to a system could ruin it
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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