Recharging with R-12

[Dood1]

My 80 vette still has some pressure in the a/c system, but I guess it needs more R-12. If I get some R-12, can I just add it to the system, or do I need to get gauges and fittings and vacuum it all out and then pump it in some how? I see small cans of R-12 on Ebay, can you just plug them into your a/c system and top it off? I have no desire to buy a/c equipment as I'll probably be selling the vette soon and will have no need for it, I'd just like to get the a/c working for a better resale value.

 

[JonM]

I usually don't tell people this often...but this I think you should leave to the pros...The system needs to be dried out and oil checked and leaks detected. It will be cheaper for you.

 

[DDLS3]

Dood1, last I knew R-12 was over $100 a pound. Your system holds 3 pounds. Do yourself a big favor, have your R-12 system recovered and vacuumed, put in 3 pounds of 401A. No other changes required, has worked flawlessly since 2001 in my 81.

 

[Dood1]

Cans of r-12 can be found on ebay for less than $20 for a 12b ounce can.
Since I still have pressure in my system after having the car for over 5 years, I dont think leaking is that much of a problem, and I doubt I need a full three pounds of r-12.
I realize that having a pro do it is a better way to go, and I may do that, but I really don't want to spend the money.
So my original question remains: Is it possible to just plug in a couple cans of R-12 into my system and charge it up, or does it need to be pumped in under pressure or vacuum or something more involved?

 

[JonM]

Maybe this can help you...http://www.id-usa.com/how_to.asp

 

[photovette]

If you know for certain that it is R-12 in your system, then you may add R-12 to it to top it off. Otherwise, pump it out and start over.

 

[Dood1]

Thanks for the link and info. That's what I was looking for.

 

[pgtr]

R12 is not anywhere near $100/lb. Last I checked it's running the $20s for a can which is just shy of a lb. You need a certification to purchase R12 now. If it's currently got some charge yes, you can just top it up. On the other hand if this is a pretty old system/charge - it couldn't hurt to evacuate, change the drier and recharge fully... but for that you'd need guages and a vacuum pump or a pro to do it. FYI an AC service shop will typically charge a lot more than the over the counter rate for R12. Good luck!