R12 Charging
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,583
Likes: 5
From: Richardson Tx.
R12 Charging
hello -
I have evacuated my system and its charging time. I am going to use 12oz. cans of R12 , a can tap and a 12 inch yellow charging hose.
When I hook up the charging hose to low side port, I am concerned that there will be a hiss when the connector on the hose gets threaded onto the low side port. ...I don't want to lose my vacuum when I make this connection.
Will I lose some vacuum at this stage and is there a way around this?
I would not be concerned if the system was already pressurized with some R12..I don't think air can infiltrate under pressure ---just not sure when it is empty and under vacuum.
thanks!
I have evacuated my system and its charging time. I am going to use 12oz. cans of R12 , a can tap and a 12 inch yellow charging hose.
When I hook up the charging hose to low side port, I am concerned that there will be a hiss when the connector on the hose gets threaded onto the low side port. ...I don't want to lose my vacuum when I make this connection.
Will I lose some vacuum at this stage and is there a way around this?
I would not be concerned if the system was already pressurized with some R12..I don't think air can infiltrate under pressure ---just not sure when it is empty and under vacuum.
thanks!
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Drive on. That tiny bit of air won't hurt a thing. When you put the hose on the port, don't hesitate. Just put it on. Same when you remove it. Wear gloves. Refrigerant is cold enough that it's just like a heat burn. Only worse.
Pro
Joined: Jul 2002
Posts: 514
Likes: 44
From: Toronto Ont
not sure if you are talking about R12 or R12a. I am assuming R12a as R12 is hard to come by these days. if you read the data sheet of the r12 a they don't recommend a hard vacuum on the system anyway, so you should be good to go and not worry about it.
Burning Brakes
Joined: Oct 2001
Posts: 918
Likes: 197
From: TX
If you are not charging through gauges then when you make the low side connection make sure you have opened the tap at the can. As you start screwing down on the fitting slowly you will see a mist of r12 as you make the connection. this should flush air from hose so you will be getting pretty much pure r12. It will take 4 cans plus another half.
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Burning Brakes
Joined: Oct 2001
Posts: 918
Likes: 197
From: TX
If you are not charging through gauges then when you make the low side connection make sure you have opened the tap at the can. As you start screwing down on the fitting slowly you will see a mist of r12 as you make the connection. this should flush air from hose so you will be getting pretty much pure r12. It will take 4 cans plus another half.
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Burning Brakes
Joined: Oct 2001
Posts: 918
Likes: 197
From: TX
r12 charging
If you are not charging through gauges then when you make the low side connection make sure you have opened the tap at the can. As you start screwing down on the fitting slowly you will see a mist of r12 as you make the connection. this should flush air from hose so you will be getting pretty much pure r12. It will take 4 cans plus another half.
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
If you are not charging through gauges then when you make the low side connection make sure you have opened the tap at the can. As you start screwing down on the fitting slowly you will see a mist of r12 as you make the connection. this should flush air from hose so you will be getting pretty much pure r12. It will take 4 cans plus another half.
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Wear gloves!!!!!! Helps a lot to put the can in a pot of water around 100 or so degrees to keep it going into system while shaking can. DO NOT invert can.
Just did this yesterday!
Good luck and be KOOOOL
VS
Good advice. (Times 3 ). 
Burning Brakes
Joined: Oct 2001
Posts: 918
Likes: 197
From: TX
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