I put a 14 oz can of 134a in my 00 olds alero with no results.

ELDORADO Refrigerant Capacity and Refrigerant Oil Type

1998-02 32.00 Oz. R-134a; 9.00 Oz. PAG-150; w/ OE Harrison Compressor
1998-02 32.00 Oz. R-134a; 9.00 Oz. PAG-46; w/ Denso Compressor.
1994-97 32.00 Oz. R-134a; 8.00 Oz. PAG-150; w/ OE Harrison Compressor

Gauge is probably bad. GM has a common issue with the gauge clusters going out.

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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

That's a REAL GOOD question! The factory refrigerant charge specifications for your vehicle is 2.20 Lbs. of R-134A. Freon R-134A comes in 12 oz, 14 oz, 16 oz, 19 oz, and 22 oz cans (as well as 30 Lb Cylinders) - it depends on which brand/size can you are buying, whether your system is COMPLETLY out of freon, or whether it still has some freon in it.

The best way to deal with the situation (in my opinion) if you are going to try and charge you own A/C system is to purchase a kit that comes with a gauge. A company called interdynamics has a real good kit available that comes with a reusable gauge. Once you have the gauge, all you have to purchase in the future is the freon itself. By using the gauge, you can more accurately charge your system without the worry of possibly overcharging. (Overcharging can cause extremely high pressures that can do serious damage to your vehicle or cause personal injury.)

Anyway, this kit is available at O'Reilly's as well as other auto parts retailers. Here is a direct link to see the kit at O'reill'ys web site.

There is also a whole bunch of instructional videos on how to charge your system at the interdynamics web site. CLICK HERE

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.)

somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.

• Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
• Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
• Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

134a freon,you will need a charge hose also,that you can get from parts store,and pick up a can of oil,pag 46 oil,if it leaked freon,it leaked oil too.It will take bout 2 to 3 cans of freon.If this was at all helpful,please rate.

Usually it will take 2 or 3 cans of 134a to charge a typical American car's or light truck's a/c system.

There are about 454 grams per lb. of matter and each can is about 12 oz. (not 16 oz. = 1 lb.).

3 cans would be 3 cans x 12 oz. = 36 oz. or about 2 lbs. 4 oz.

If you round down to 2 lbs., then the grams is about 454+454 which is about 900 grams rounded down.

You could find the grams per ounce and multiply by 36.

454 /16 = 28.375

and 28.375*36=1021 grams for 3 12 oz. cans of refrigerant.

It does not use Freon it uses 134a and it depends on condition of compressor and how much is in it. I would go to Auto parts store and buy 2 cans of 134a with the gauges on them if you read the can or the gauge it shows you when it is full. Make sure you connect to the Low side of connection.