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Re: How many cans of refrigerant should go in to charge...
This must be a 15 passenger van or a Limo maybe. Keep adding cans till 35 psi on the low side or the fan belt starts squealing. if the belt is squealing that is an indicator you have a bit too much in there.
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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.)
This condition is usually an indication that the a/c refrigerant level is low. The driver's side will always get heating and cooling first. I would recommend having the refrigerant level checked and also having it leak tested.
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.
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The R134 capicity for your truck is 64oz with rear a/c.
If the system hoses have been disconnected or if you
are replacing any of the system components ie.
compresor/condenser or reciever drier. It is importent
to evacuate the system to remove any moisture from the system before charging, to avoid problems down
the road, I recommend taking it to somone that has
the proper equipment to ensure all moisture is removed and it gets the proper oil charge and won't
get air bound, plus any leaks that remain will be detected. A proper evacuation and charge can be the
difference between luke warm and COLD air.
Hope this helps.
See if it's the compressor by watching the compressor either spinning ( compressor is working ) or not ( compressor not working ). Compressor will not engage if refrigerant is low. Add R-134a ( 12 oz. can )
Your AC is low on refrigerant; The AC compressor needs a minimum amount of regrigerant to run. If and when it does run (while low on refrigerant) the air coming out of the vents will not be cold. The refrigerant you require is R-134A and is available over the counter but if you are the least bit unsure as to how to add refrigerant, taking it to a garage that does AC recharging would be your best play. If you want to try to add refrigerant on your own you will need the following, 1LB can of R-134A, an AC hose adapter to deliver the refrigerant, and preferably an AC pressure guage to ensure you are not overfilling the AC line which will damage the system.