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Old 08-05-2013, 01:30 AM
Brian Carlton Brian Carlton is offline
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Originally Posted by seebeexee View Post
It's my understanding that refrigerant is always measured by weight (mass), not volume. Since refrigerant is packaged and shipped in liquid form, but dispensed as a gas (which is difficult to measure given varying densities as a result of varying temperatures and pressures, it is much easier to measure it by weight. Every A/C refrigerant sticker I've seen on a car identifies the required refrigerant amount in either pounds, kilograms, or sometimes both.

Refrigerant cylinders are always measured by weight, i.e. a 30 pound cylinder of R12 likely weighs 30 pounds full, but about 7 pounds empty, so the cylinder would be said to contain about 23 pounds of R12.

Additionally, the cans I used were specifically marked "Net Weight 12 Oz." not 12 FL OZ, so they are clearly being measured by weight.

Below is a picture of the cans for reference.
No mistaking that.

Clearly, you'll need just about four cans, as you stated.

One other concern I have is the vacuum level. 27" is nowhere near the level needed to get all the moisture out of the system. In fact, there are some that suggest that 29" isn't even good enough when the residual moisture is calculated.

I have no personal experience with those levels, however, it does appear that those who suggest that you really need to be above 29" have a decent argument.
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