Help with AC
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Cross-Country
Joined: Mar 2019
Posts: 50
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Okay I'll hook it up to my buddies machine, vacuum it and put the recommended amount back just to be safe. Thanks everyone for the help!
Posting Guru
Joined: Jun 2009
Posts: 1,908
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From: Fort Smith, Arkansas
Also pay attention to what exactly you are putting in there. If you have a big bulk tank of R134a it should be fine. But if you are using small cans it might be a 12 ounce can but they will often have leak stop, oil, dye, etc. which will change the actual volume of R134a in the can. It may not be much, but if you are trying to be exactly precise and are counting by total can volume then the total refrigerant volume installed could be too low because of the additives.
Senior User
Joined: Jan 2008
Posts: 377
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You had the help of a professional AC buddy. Ask and do what he says. I am a do-it-yourself-er, have replaced AC compressor only once. High side hit above 150 before adding the label weight of R134a. Being afraid of overcharging, I did the final charging after several days of normal use of AC. Here is a pressure chart.
I always use the lower number in fear of overcharging.
I always use the lower number in fear of overcharging.
Senior User
Joined: Jan 2008
Posts: 377
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My rationale has been overcharging stresses the hardware but undercharging lowers efficiency. But I will take up your suggestion and hit the middle. haha
Senior User
Joined: Apr 2014
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Since OP hasn't responded back if low charge was the issue, here is what happened on my sons 98. The low pressure hook up on the bottom of the dryer, had a leaking valve stem. It is just like a tire valve stem, and you can buy replacements, but there are several sizes, and you must find out what size you have. We evacuated the system, removed the valve stem and took a quick picture of it and reinstalled. Went and bought the proper valve stem, removed old and reinstalled new valve stem. Pulled a vacuum for about 45 minutes, then recharged. Held no problem, no cycling and frosty cold.
Just something to check if it is loosing refrigerant. Could also happen on the high side as well (top fitting on Dryer).
Good Luck.
Just something to check if it is loosing refrigerant. Could also happen on the high side as well (top fitting on Dryer).
Good Luck.
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