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Air conditioner system is
discharged. Have the system evacuated, charged and leak tested by an
MVAC certified technician, utilizing approved recovery/recycling
equipment. Repair as necessary.
Air conditioner compressor clutch
not engaging. Check compressor clutch wiring, electrical connections
and compressor clutch, and repair or replace as necessary.
Low pressure service port is located on the Accumulator ( Silver Cylinder ) where the low side A/C line domes from the compressor. Location is on the passenger side fender by your evaporator housing and blower motor housing.
Thank you for using fixya and don't over charge your system.
There is surely a specified quantity if the system is completely exhausted which they normally aren't.
Intake pressure (on the low-pressure side) to the compressor is monitored and best measured with low-cost fill-kits that have a gauge and simple instructions on where to connect it and which pressure should be obtained.
The kits and coolant can be had at any chain auto parts store.
I'm not sure if I understand you correctly. Does the air conditioning works properly it's just the sound problem and did it happens suddenly?
For the strange sound, it could be normal and not.
I imagine the sound comes from the exchange pressure between the low pressure and high pressure.
To fix or knowing what is wrong you will have to get AC/pressure gauge install on AC/pressure tap under the hood and sync the compressor engaging clutch if it happens at the same time that the sound you are talking about.
Pretty hard to tell online without earing it. But I ever listen to a sound similar to that.
if it is low on freon the compressor will have 0 volts becuase the low pressure switch on the evaporator isn't triggering...if you have freon then replace the low pressure switch...take a small piece of wire and disconnect the low pressure switch and jump the two sides of the plug together...compressor should come on
The high pressure and low pressure hoses are different sizes at the gear box. And the low pressure /return hose is usually rubber with a clamp at the back off the pump.
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