I finally got my new relay for my AC compressor and want to install some freon. when installing freon, the lil cans that you can buy from discount auto parts, do you hold the can upright or upside down when putting it in using the right connector? and how many cans should be enough?
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Take it to an AC shop and have them do it. If you still have refrigerant in your system, you run the chance of overcharging it which will cause higher than optimal pressures, and you run the chance of blowing seals. Like I said, have a shop recover all the old refrigerant, and weigh the new charge into it. If your car uses R-134A you're looking at a $100 job TOPS. also...if you have a working system, you don't need more oil. Too much oil is bad. Think of your car's engine. It's meant to run on about 4 quarts. If all of the sudden you dump an additional 4 quarts in, your engine won't be happy.
From what i understand, you need to create a vacum so the freon and the oil in the bottle come out. When you turn the bottle upside down all the oil will come out and not the freon. But i could be wrong.
I run an HVAC business so let me clarify this. Old systems can be topped off with refrig, and this can be measured correctly by using pressure gauges. If you are removing refrig from a system, you are supposed to reclaim all the old into a cylindar and have it recycled. You do this by using a reclaiming pump. After the old is removed, you use a vacum pump to remove anything left behind in the lines which prohibits contamination. A scale that weighs the charge is the best most accurate way to recharge a system, but the most expensive.
I would suggest that you get the freon filled by a car shop. They have good tools to do that plus they can vaccume the whole unit for some time (say 10 minutes) that would remove all the moisture and stuff. Plus they could also tell you if your system holds vaccum or not. It cost about $125 for the recharge in some shops I guess.
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