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adding freon

cbravo99 on Thu September 23, 2010 8:53 PM User is offline

Year: 2004
Make: Acura
Model: TSX
Engine Size: 2.4L
Refrigerant Type: R-134
Country of Origin: United States

I need a small top up of refrigrant..service man is telling me oil should be singn of any leak..What is an acceptable amount..This is my first service

GM Tech on Thu September 23, 2010 9:09 PM User is offline

The acceptable amount is specified on your a/c underhood label-- given as the total system charge- the only way to do it correctly is to recover and weigh what is presently in the system- then based on that, find and fix your leak- then evac and recharge to system spec.

What is the basis that made you decide you need to add refrigerant (not freon)?

An acceptable amount of refrigerant oil to be added is one ounce--I prefer to add fluorescent dye as well to help find the lak.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Thu September 23, 2010 at 9:10 PM by GM Tech

NickD on Fri September 24, 2010 11:59 AM User is offline

Still hearing a lot of old timers calling R-134a "free-on", an old Dupont trademark name for strictly R-12, Freon, that is anything but free.

Apparently, DuPont has a bug up their butts for trademark names, for R-134a, what your vehicle uses, their trademark is "Suva", but have yet have anyone refer to it as "Suva".

EPA claims that the average passenger car vehicle can lose 10% of R-134a per year, with kind of, you manufacturers, if you have the time, or would like to, really not forcing you too, can you, maybe, really not making you, do just a little better? Sure in the hell don't tell that to techs, if you release even a gram of it, we will hang your ass kind of thing.

R-134a systems can be successfully topped off, and extremely tricky with a variable displacement compressor, requires a great deal of skill, so won't even recommend it. But kit manufacturers that for some strange reason are not outlawed by the EPA seem to think otherwise and are still getting away with it. Don't even mention a thorough inspection for any, even the slightest oil leaks.

With Murphy's law, possible to lose all or most of your oil without losing any refrigerant, and vice-versa, the risk is having to replace a good portion of your system. If any kind of oil leak is found, the only correct way is to completely drain and flush the system, and add the manufacturers specified of type and amount. No shortcuts here.

Would be nice if they had some kind of an oil dipstick, but don't, use to have a sight glass for that. But the key word here is, "use-to".

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