Retrofitting the a/c from HFC-134A to R-134A refrigerant is it the top nob or bottom nob

REMOVAL
A/C Compressor Mounting
1. Discharge the refrigerant. Refer to MTC-111, "HFC-134a (R-134a) Service Procedure" .
2. Remove the front right wheel and tire assembly. Refer to WT-6, "
Rotation" .
3. Remove the engine under cover and the splash shield using power tool.
4. Remove the engine air cleaner and air ducts. Refer to EM-14, "
Removal and Installation" .
5. Remove the drive belt. Refer to EM-12, "
Removal and Installation" .
6. Disconnect the compressor electrical connector.
7. Disconnect the high-pressure flexible hose and low-pressure flexible hose from the compressor.

this is best done by a ac specialist as it operates at higher pressures than the old gas. If you need to add refrigerant then you have a leak that has to be fixed first

https://www.youtube.com/watch?v=-p2WzuoSHHA
just watch this video, it will tell you everything you need, and how to do it!

Refrigerant HFC-134a or R134a
Weight 330 - 390 gms
With correct refrigerant:
Low side pressure 1.5-2.5 kg/cm2
High side pressure 14-16 kg/cm2

R12.... In 1994 R134a was required, but some changed earlier. Yours may have been converted. If the service ports are threaded it still has R12. Hope this helps.

It depends on what size cans of freon you are getting and if the system has been retrofitted for R-134A refrigerant (1992 came originally equipped with an R-12 system). The factory specifications call for 1.8 Lbs. of R-12. If it has been retrofitted for R-134A, the general "rule-of-thumb" is 85% of the R-12 specification is needed to charge the system with R-134A. So if we do the math: 1.8 Lbs (R-12) X .85 (R-134A) = 1.53 Lbs. R-134A needed for a full recharge (providing the system is COMPLETELY empty. Then you will have to find out how much is in each can that you plan to buy and do the math to figure out how many cans you need. (some have 12 oz., some have 14 oz., some have 16 oz., some have 19 oz. and some have 22 oz.)

First, the old R-12 must be completely evacuated fromt the system. R-12 and R-134A do not mix and won't function together. Once you are sure there's no R-12 left in the system, you need to install an R-134A fill valve on the low side AC line. This is where your refill hose will connect to add R-134A. Once the valve is in place you're ready to fill the system. The compressor requires a minimum of 20psi to engage and should not be filled to more than 45psi.

RECHARGING AC SYSTEM

1.Turn the truck on and turn AC on HIGH
2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4.Insert the other end of the refill hose to the low side valve
5.Puncture the R-134A can with the screw on the refill hose
6.You should feel the system suction the refrigerant out of the can
7.Check for frost on the AC lines and the air blowing inside the truck
8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.

I'm not sure if the system on that car is 134a or R12. There should be a decal under the hood that will tell you which one you are currently running, or on the compressor if it is easily visible. If it is an r12 system, you will have to buy a retrofit kit that converts the charge fittings to take 134a, as they are different size fittings.

Ok, heres a tough one. In 1995/1996 car manufacturers switched from using r-12 and began using r-134a. If you vehicle uses r-12 you need to put a retrofit kit on you car in order to change to the new r-134a. The best bet for this is to have a repair shop do it as the system needs to be emptied and vaccumed down to check for leaks. r-12 is very harmful to the environment and needs to be handled accordingly. Once the retrofit kit is applied, then you can use r-134a and you are good to go.

r-12. yes you can buy it.