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1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Jonathan
It is really not a good idea to connect a can of refrigerant to the high pressure side of the compressor. (There is usually a warning on the can saying not to do this!) You run the risk of having the can rupture while you're holding it, spraying refrigerant and oil (not to mention shrapnel from the can itself) everywhere. I urge you not to do this anymore -- you're very lucky you haven't had an accident. And please don't suggest other people do this. The only reason there's a port on the high side of the compressor is to check the pressure there. It's not for filling the system.
There are other reasons it's not a good idea, besides the obvious safety one. The flow on the high side is away from the compressor, which means any oil in the can will go down into the condenser and have to travel around the system before getting back to lubricate the compressor. If you're filling a drained system, that means the compressor won't get any lubrication for awhile.
The high side line from the compressor does not have liquid in it. It has a very hot gas under pressure, which travels down to the condenser. In the condenser it CONDENSES down to a liquid again. (That's what the condenser is for -- a heat exchanger to remove the latent heat of vaporization from the pressurized gas.) It then travels as a liquid to the expansion valve, and evaporates back into a cold gas (it actually boils) in the evaporator. The compressor should only see gas going in and have gas coming out. That means that what really happens when you hold the can upside down on the running high pressure line is that liquid flows out only while the can pressure is higher than the pump pressure. Once they're equalized, some gaseous freon may bubble into the can while liquid comes out, but typically the hose and valve fitting are too narrow to make this efficient. Gravity isn't going to do this job very well.
Finally, if you connect the can to the high pressure side, the pressure in the line will prevent you from emptying the contents of the can. You may get =some= of the liquid out, but nowhere near what you can take out by hooking to the suction side of the pump.
Vacuuming the air from the lines before you start is really the only proper way to service an A/C system that has been opened to the atmosphere.
Please be very careful if you persist in using your procedure -- heavy gloves, eye protection, protective clothing (suit of armor?) are a good idea if you're going to risk exposing yourself to an exploding aerosol can full of chemicals that can burn or blind you.
Sincerely (and with friendly concern),
- = M = -
posted by 208.63.20...
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