usually if the coolant is low, which is a high-pressure gas, the compressor
will cycle on and off and on and off, and the cold air coming out of the
vents won't be as cold as it used to be.
the system will have to be recharged at a dealer or mechanic shop ;)
If it works, leave it alone. If the R-134a refrigerant goes low, the
unit won't cool properly and eventually, if it goes low enough, the
compressor won't engage at all; which is good because running it on low
refrigerant won't lubricate the compressor properly and may cause
damage. But well before that, you'll be dissatisfied with the poor cooling.
If it ain't broke don't fix it. all you do is create problems for yourself.
I have twocars 8 & 12 years one with 143000 miles Never touv\ched either AC.
I live in Alabama and they have been used a lot.
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