Automotive Air Conditioning Information Forum (Archives)
Dumb question about refrigerant
jamit on 
Sun July 24, 2011 4:53 PM 
I had a questions about refrigerant . I wanted to know is how it works does it last forever unless you have a leak or over the years does it get lower and lower? So is it normal for a car to get low on freon? Thanks
bohica2xo on Sun July 24, 2011 5:35 PM
The refrigerant does not "wear out" - but it does leak.
It is virtually impossible to seal a system in a vehicle as well as they are in a home appliance. There is a rotating shaft seal on the front of a compressor, several feet of rubber hose, and many joints sealed with rubber seals.
Over time any MVAC system will lose some refrigerant. I believe the allowable leak spec for just the service valves adds up to a half ounce per year. Eventually your system will be too low on refrigerant to work properly - even if the car was parked.
B.
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