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A good place to start is 80 percent of the original charge. IE: if your truck took 2.25 lbs of r-12, then multiply 2.25 x .8 = 1.8lbs x 16oz = 28.8 oz.
The first thing you need to check is that the AC system has a charge and it hasn't leaked out, that can happen very quickly on this old of a car. Have a set of special AC gauges hooked up by a shop to determine the systems charge level. If it is low or gone then you will need to find the leak, this takes a special tool in many cases called a gas leak detector. Your system uses R12 type freon and it is no longer produced for environmental reasons, so you must buy and install a retrofit kit to use the new R134 refrigerant, doing this right is quite time invloved and expensive. When all is said andone you will likely be out about $1000.00 for the repair job.
in 1990 cars took r12, if your car has not been retrofitted to 134 the valving will be wrong, and you will not be able to add freon. you will have to at least get someone to look at it and tell you if it has been retrofitted or not
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.)
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.
actually might be not to hard, the problem is than you need a recovery machine to save the refrigerant and then recharge the system with refrigerant, and acording to the year of your car it might be R-12 OR R-134. REFRIGERANT, if r-134 it is ok but if it has R-12 then just have a shop working on it since the r-12 is too expensive, i will recomend you to retrofit the system tro freeze-12 all this 12s and 134s than i'm talking about is the kind of refrigerant on your car, but if it has r-134 leave it like that,
and feel fre to ask for any thing elese and good luck
just one more thing, if you are going to try to recharge the system by your self make sure to do it by the low pressure side and not the high because it will be very very dangerous.
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