AC tools

[daveismissing]

recap: what I have is a Buick converted to 134a when the compressor was replaced.
Been a couple of years, wasn't cooling worth a d*mn.
I saw 20-24 lbs and cycling when set at max settings.
All I could get this trip was 134a with crap in it, not seen anything locally.
Don't want add too much of that.
Added some - stopped cycling and gives a bit of cool at ~30 lbs
Added some more - better may 65deg at vent with 35lbs

So I guess I'm not doing it the right way, just trying to get by while the truck is down.
Chart on the can says 40-55lbs at these temperatures?
does that sound reasonable?
 

[SuperSix]

Did you adjust the pressure witch for R134a?

[ULYCYC]

Did you adjust the pressure witch for R134a?

You mean the one on back of the broom?

[ULYCYC]

It's real hard to get it right the way your doing it.  The fastest and best results is to evac. the system, check/replace the orfice tube then vacuum down and hold 30in's for a few hours. If it holds the add 3 cans of pure 134A. Now your gauges will show how it working. Make sure your cycle switch is working also as said above.

[Steve Wood]

don't know what your temps are, but, 40 psi sounds reasonable

[daveismissing]

Here is the requested pic- my high side
measures 3/8 across the threads
What fits there?

[SuperSix]

THat looks like an R134 connector.

[Steve Wood]

134A connectors are quick disconnects

[ULYCYC]

This may help. You need to buy an adapter for your gauge set hose.

[Charlief1]

That was one of the stop gap things they did before converting to R-134. It's a high side quick connedt unit used for high speed filling at the factory. Nothing special really and you'll need to find a special adapter to change it over to R-134.

[daveismissing]

So I really need an old style R12 fitting that mates to the 1/4 hose flare fitting?
They seem scarce.

[daveismissing]

Is this is it?
http://www.tooltopia.com/robinair-10468a.aspx

[Charlief1]

Is this is it?
http://www.tooltopia.com/robinair-10468a.aspx

That's the bastard adaptor for the R-12 guage set alright. You've got to remember that originally the high and low sides had the same fittings on them. They made the high side smaller so people wouldn't try to charge on the high side and blow the tank or can up. When they started looking at going with R-134 they came up with that bastard child to keep from blowing refridgerant when removing the charge hose off the high side. Didn't work worth a damn but they tried at least.

[Just a Six?]

Mine look similar to the first few pics. But I could take a pic tomorrow if you want or just meet me somewhere & you can try them. Wally World USA with caps etc was under $20
 
http://autoacrepairs.com/134a%20CONVERSION%20FITTINGS.htm

[Steve Wood]

You are making this awfully difficult.

If you are going to empty the system and suck it down, then put the right fitting on it.

If not, put enuf freon in it to get to 40 psi and forget about it.