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Unless that system was changed to Freon R-134A You wont be able to recharge it. Those used R-12. you cannot get r12 any more. It was banned. The low side port is what you are looking for, I you see the compressor mounted on the engine, follow the hoses one goes towards the passenger compartment and one goes towards the front of the car. The one that goes to the front is the low pressure side and it should have a fitting on it that looks like a tire pressure fill cap. That is the one that you want. NOTE that if the system has not been converted to 134a, you cannot use 134a. There are lots of things that have to be changed. It is not cheap to have it changed.
Hi, determine if your car uses R134 or R12 refrigerant. You will notice screw type connectors on the both the High Pressure Side and Low Pressure Side lines in models using R12 refrigerant. R134 compatible models have quick connect valves on both sides. Models made before 1995 may use the old R12 refrigerant. If this is the case, you must have your Chrysler's air conditioning system retrofitted to use R134 refrigerant. Mixing R12 and R134 refrigerants is dangerous and may cause damage to your vehicle.
Check your air conditioning system pressure using an automotive air conditioning pressure gauge. Keep in mind that in order to get an accurate reading, the air conditioner has be turned on the coldest setting with maximum blowing power.
Remove the Low Pressure Side port valve cap and set it aside. The location of the port varies, but it is usually in front of the engine block. Attach the refill hose to the port on the Low Pressure Side of the air conditioning system. The Low Pressure Side port is smaller the High Pressure Side port. Because the ports are different sizes, the refill kit hose should fit only on the Low Pressure Side port. Additionally, the High Pressure Side port will usually have a red cap or be marked with an H or the word High
Allow the air conditioner to **** the refrigerant out of the can by slowly turning the valve on the refill kit hose. Pay attention to the way you hold the can. Most kits will have you hold the can upright when you recharge the air conditioning system. It may take as long as 10 minutes to empty a single can.
Turn the valve to the off position and remove the refill hose from the port. Recap the port before closing the hood.
Let the air conditioner stay on for at least 30 minutes. This allows the refrigerant to move throughout the entire system.
Small port is the suction side of the system. Make sure you have a gauge to monitor system low side pressure. Ambient temperature makes all the difference as to what pressure it should be when full. Probably between 25 and 40 psi.
There isn't a tank, and it's not "freon". The refrigerant in your air conditioning system is either R-12 or R-134a, most likely. It's a compressed system that is in constant flow when the pump is operating, so if you need to add or charge refrigerant, you do it through the low-pressure port on the air conditioning lines. The recharge kit will only work on one of the fittings, so short of not using the kit properly, you can't mess it up.
If it leaks 134 it will leak R-12 .I have changed hundreds of systems over to 134 without any complaints. Don't let the 94% eff rating of 134a scare you because that does not mean that your ac system will lose 6% cooling ability .A large class 8 truck or maybe a high roof van black on black and poor insulation might tax the system in the 90% range on 100 degree days but most systems never get close . 134a high side pressure will be about 18% higher so most systems you need to change the high side cutout.The R-12 electric fan switch will be ok just make sure it is engageing the fan when the pressure comes up.You must check the condensor in front of radiator to make sure air flows easily thru it.On systems where the hoses screw on each side of the dryer I replace the dryer .Drain oil from compressor and replace with 134a oil .Replace that bad valve core (with ac valve core not a tire valve) Now very very important vaccum the system and if no loss of vaccum in 20 min charge with manufactors recomended amount of oil and freon.If a system is low on freon (cycling in & out on low pressure switch) you can add a pound of charge with those small cans of same type freon no problem but when there is a leak and the charge has been lost or changing freon types you must pull a vaccum to properlly charge the system. If you just charge R-12 or 134a your system will have traped non -condensables and a large drop in cooling ability. Hope this helps. Harold
Follow the biggest a/c line from start to finish.Usually the a/c port is located near the firewall.I have seen the port located under the passenger wheel well.There should be a decal that states the type freon on or near the fan shroud,core support or on the under side of the hood.It is most likely to be type r-12.You can purchase an r-134a conversion kit. If you are not a/c certified to use r-12,you do not need certification for r-134a.