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Old 06-13-2015, 02:18 PM   #1
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AC valve

I tried to add a little refrigerant today. Had the car running with fan on high and AC on Max. Hooked up the line and added a little until the gauge said the system was charged. Popped the hose off and refrigerant shot back out. Any ideas what wrong?


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Old 06-13-2015, 06:02 PM   #2
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busted valve core or o ring.

prepare for everyone to tell you that you shouldn't have touched it. But not specifically for that reason. otherwise maybe there was something stuck in there holding the valve core open. its like a tire valve. a little pin gets pushed in and opens the line, allowing you to add refrigerant.

Ive added refrigerant to multiple cars without this happening, so my guess is just bad luck with the core.
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Old 06-13-2015, 06:11 PM   #3
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Quote:
Originally Posted by fenixignition View Post
busted valve core or o ring.

prepare for everyone to tell you that you shouldn't have touched it. But not specifically for that reason. otherwise maybe there was something stuck in there holding the valve core open. its like a tire valve. a little pin gets pushed in and opens the line, allowing you to add refrigerant.

Ive added refrigerant to multiple cars without this happening, so my guess is just bad luck with the core.
Interesting. I'm a newb in this area. Do you have some literature that would elaborate on what you're describing?
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Old 06-13-2015, 06:24 PM   #4
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i dont think ive ever found literature on it. i would just look up tire valves and valve cores, then you have the same idea for the port on the a/c line.

cut away of a valve core.

the low pressure side valve where you add freon.

a tire valve, very similar concept, except with air instead of freon.

an illustration on the high and low pressure sides of the a/c system.

as far as literature goes, idk. over time i just read the labels on the freon, googled it, and read other forums, and formulated my own opinions on it.

To narrow it down, as far as my opinion goes, If it is a newer car or a healthy a/c system, try to avoid adding freon, and especially no leak sealers without a professional oppinion. If it is an older car like mine, and you dont have the money to start replacing parts, and you know you have a leak, then go for some leak sealer, and every so often, check the pressure and top it off to keep it running good. So far i have a leak, and i think its the front seal on the compressor. so for now, i added a sealer, and topped it off, and later, ill look into replacing the seal, if not the whole system, vaccuming it, and replacing the freon.
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Old 06-13-2015, 11:24 PM   #5
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I don't have the equipment to capture refrigerant or vacuum the system, so I guess I'll have to take it to a shop. Or roll the windows down!


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Old 06-14-2015, 05:33 PM   #6
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Quote:
Originally Posted by fenixignition View Post
i dont think ive ever found literature on it. i would just look up tire valves and valve cores, then you have the same idea for the port on the a/c line.

cut away of a valve core.

the low pressure side valve where you add freon.

a tire valve, very similar concept, except with air instead of freon.

an illustration on the high and low pressure sides of the a/c system.

as far as literature goes, idk. over time i just read the labels on the freon, googled it, and read other forums, and formulated my own opinions on it.

To narrow it down, as far as my opinion goes, If it is a newer car or a healthy a/c system, try to avoid adding freon, and especially no leak sealers without a professional oppinion. If it is an older car like mine, and you dont have the money to start replacing parts, and you know you have a leak, then go for some leak sealer, and every so often, check the pressure and top it off to keep it running good. So far i have a leak, and i think its the front seal on the compressor. so for now, i added a sealer, and topped it off, and later, ill look into replacing the seal, if not the whole system, vaccuming it, and replacing the freon.
Thanks man. Makes sense.
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Old 06-14-2015, 09:57 PM   #7
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If all your refrigerant leaked out, take the car to a shop. You are going to have them put a vacuum on the system anyway before putting new R134 into it and they can replace the valve too while they are at it.


If it didn't all leak out then you can stick a screwdriver in there a bunch of times to try to re-seat it and see if that works and then try to fill it again.
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