How to refill refrigerant.

If you look on air conditioning cooling charts and all that sort of stuff you will see a target temperature for the outside relative humidity and outside temperature being in a range and so on In most cars where it's real hot if you've got 54° or colder air coming out of the vents you're probably in pretty good shape most of my cars are pushing like 46 something like that seem to be working fine I'm sure they're not overcharged if anything they're a tad under The electric compressors the minute you get a little bit overcharged if you're into any of this at all you can hear the compressor start to load up and chug almost like a freight train at that point you just give up a few shots out your yellow hose if you have a reclaimed setup you can shoot it into there 134a a couple shots into the air never going to hurt anybody so there you go and then like I say in your vehicle depending upon where you are and the kind of driving you do lots of bouncing the car around and whatnot You're going to need to top off about every 18 to 24 months If you run the air regularly Mobile systems and systems like this are allowed to leak and allowable amount there's data on this all over DuPont's site and other sites this is just part of the use of gases whatever they are refrigerant or otherwise so there is an allowance that is allowed You're shooting for nothing but you know there is a tolerance o rings gaskets people not connecting the gauges the same way all that stuff leaves room for something to escape even if it's minute.

 

Yeah I'm using manifold gauges so I can see the high side and I've got a valve that allows gas to escape and for other gases I have this thing that turns the gas into a liquid and all of that like I said I just run it up until a thing just barely starts to labor two shots out leave it all connected running about 20 minutes Make sure everything is smooth and nice no funny business and this is being done on a very hot day preferably

 

I'm revisiting this thread as I'm trying to re-gas a new AC compressor on my 3rd gen. It seems this can be done "by feel" but there are pretty tight tolerances. I've pulled -30psi vacuum and then very slowly added around 8oz of refrigerant. I'm using the sight glass method, giving her little toots every 60s or so. I do hear the compressor kick on and then my low side drops to -10psi vacuum. At that point the sight glass tends to stay full after a shot. Not blowing too cold yet so I guess I slowly add until I feel joy?

#1 goal here is to not blow my new compressor. Thanks for any tips.

 

You need 16.64 ounces of pure r134a and up to 4.5 ounces of ND-11 refrigerant oil, depending how much was in the oil compressor.