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There are many ways to recharge an ac system but to do it correctly is a bit more in-depth. You can read the ac tag under the hood of your vehicle and purchase a can of coolant then hook it up to the low pressure side as shown on the can. Start the engine and follow their instructions. If you have a leak you should add UV dye to the system to locate the leak then repair as needed. To recharge system I recommend purging the system to a proper catchment contaner, recycle the refrigerant as required. Put an ac manifold on the high and low ports of the ac system (they are sized to only fit in the proper location) then attach a moisture removing vacuum pump create a vacuum in the system of 20lbs at sea level or more. Close the high and low pressure valves and disconnect the vacuum pump connect the refrigerant to the vacuum line, start the vehicle, turn on the ac (fan on low) add the amount of refrigerant that your vehicle tag requires.
Your system may just be low on freon. Most auto parts stores sell 134a freon for about $10 a can. If you visit an Autozone store the parts counter personnel might also show you how to add freon to the VW Beetle, it's not hard once you know where the correct port is located. You simply start your car, connect the freon dispensing hose to the AC port (there are two (2) ports, but the hose connection will only fit onto the smaller of the two (2) ports - the low pressure side). Allow the car to run while the can is discharged into the AC system, generally takes 10-15 minutes. Most dispeners have a freon pressure gauge on the hose portion that attaches to the can. Never disconnect a partially empty can unless there is a shutoff valve, and the valve is closed all the way. Better to add the entire can to the AC system.
If you have never added freon to your 2003 VW Beetle, that's the most likely problem. You could also have developed a slow leak in the compressor or AC lines, so I recommend adding freon WITH a sealant in the same can just in case.
The job would cost between $45 and $65 if you take it to a reputible mechanic to perform. That usually includes a full blown pressure test of the AC system. and a whole list of costly recommendations.
the correct one should be smaller, and your recharge hose should be only able to connect to it. the smaller fitting is the low side, and the larger fitting is the high side. recharge only to the low side. the high side is used by technicians with elaborate ac manifold guages to monitor success. these guage kits can be bought at harbor freight for about 55 dollars,and give a better recharge,as you can regulate pressure as not to overfill, which lessens the cooling
The charging port cap is usually blue, The charging fixture hose will not clip onto the wrong port, so you really can't mess that up. the pressure of a system as measured on the low side hose should be about 28-32 PSI with the system stabilized and engine at operating temperature.
The low side port is located near the firewall at the back of the engine compartment near the right strut tower. It has a black plastic cover similar to a tire valve. Do not connect to the high pressure side which on my vehicle is located towards the front of the right side near the radiator. You will need R-134a and a connector kit. If you have leaks they should be corrected before recharging.Thanks. Keep updated for any more query. You can rate this
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> I was going to add some more freon and the gauge that came with the can does not fit the valve.
There are normally two valves on the AC lines; one is the low-pressure valve (inlet to the compressor), the other is a high pressure line leaving the compressor and going into the exchanger.
The low pressure valve is the point at which Freon is added and pressure is measured with a single valve.
The high pressure valve is customarily used only by service personal to determine compressor performance and should never be used to recharge the system; they are intentionally different to avoid rupturing the the Freon container.
Trace all of the lines to be sure if you have found the right one to use for recharging and measuring the 'low' pressure side.