Questions about factory AC

[sam24th]

So normally I wouldn't give a flying rat's ass about my AC on my 4runner, but I have to start picking up my little sisters from school soon and having AC in the 4runner would be nice. Today I went out to my 4runner (1989 3.0) and tried turning on the AC to see if even worked. I've never messed with the switch and found that when I turned on the AC the idle went wayy down almost killing the engine at idle. Is there an adjustment for this anywhere?

Also I know the original system had R12 in it and I was just going to throw in some R134, yea I know probably not the best thing or proper thing to do, but I did it on my 84 model and it works fine and the AC works. It just leaks out over time and I have to put a small can of the stuff in it once a year. Was planning on doing the same for the 4runner. Anyone know which side is the high pressure and low pressure port? Both sides have shrader valves and I dont want to use the wrong port.

 

[wshiverick]

how'd you even get the new refrigerant in that other one? I thought the valves were different sizes

 

[sam24th]

how'd you even get the new refrigerant in that other one? I thought the valves were different sizes

Old R12 uses the old shrader valves on both high and low side. The newer R134 has diff valves for both. If you go to your local parts store they have the kits to convert the R12 valves to R134. Its just a screw on valve and Ive had pretty decent luck with em.