Jetta ac leaking at high pressure valve

it's straight below the high pressure valve about a foot. it's a little stem with a cap on it. it's kind of by the oil flter. i didn't see it the first time i looked either.

try to throw cool water on the condencer front of the engine radiator and see whether any cool air comes in the car. If so see whether the pressure valve is working okey or not because might the pressure is not sufficient.

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.

If you follow the lines coming from the A/c compressor, you will find a red cap on one line and a blue cap on the other line. The blue cap is the suction side. Remove the blue cap. You can buy recharge kits at the parts store that have a line and tap included. You just couple the line there, open the valve on the freon can and start the engine. Run the a/c on high. Be careful not to overcharge the system. If the belts start squeeling, that will indicate too much freon in the system and a high presure situation.

Yes. You can get a recharge kit at your local parts store. You can get cans of freon with hose attached. You will need to start the car and turn the ac on full blast. If you follow the ac hoses you should find two caps that cover valves. 1 is high pressure, the other is low pressure. Take the cap off the low pressure (it is smaller). Test to see if the hose end will attach to the plug. If so, that is the one. MAKE sure that the compressor clutch is kicking in and out-you should be able to see and hear it. This is the front part of the compressor where the belt turns. If low on freon it will be doing it fairly fast. Shake the can real good before you start. Twist the "t" handle down to pierce the top of the freon can. Then back it out. Hold the can upside down and keep shaking ocassionally.The can should start getting cold in your hand-that slows the freon is going out. and the compressor should run for longer periods. You may need more that 1 can, maybe not. You may want to get the can that has oil charge and stop leak/leak detector in it as well.

on a 99 they use R134A and I suggest you buy a can from autozone the one with a gauge on it and it has compressor oil in it. When you use the can that has the gauge it will tel you several things one if the compressor is leaking and does it have vachum and it will keep you from over charging. It will hook up on the low side, and it will be on the passenger side by the fire wall. unscrew the blue cap start the car turn the ac to max A/C and fan on max do this in the morning as it will take a chage better if it's not hot, then crack open the valve on the can to allow enoungh freon to get the air out of the line of the can, this is very important, air mixed with refrigerant creates an acid in the ac system and will eat the rubber hoses and the orifce tube. Now screw the cap of the can on quickly and get it tight and open the valve on the can 1/2 to 3/4 turn and watch the gauge, shake the can back and forth to allow gas and liquid into the sytem so it will not slug the compresor with to much liquid and damage the compresssor, continue to wath cht gauge if it gets about 50 then shut off the valve and wait watch the gauge to see if it drops down to 30 if it does check inside to see if the air is cool if it's colder ad a little more watching the gauge as you do and continuelly shaking the can back and froth that is from side to side not up and down, I want to be clear about that. If the gauge reaches 50 shut the valve off check to see if it is cooling more, watch the gauge with the valve off if it drops to 30 again then quickly unhook the can screw the cap back on and then drive it on a stright away for a couple of miles to see if it gets cooler, if it does you may try to add more refrigerant but be careful cause at a certain point like 50 on the gauge it will stop cooling and yo will have it over charged and since you can't see the high side pressure we are just guessing what it is, if it's 30 on the low side then it will be 225 on the high side if its close to 50 the high side will be 300 to 350 and close to poping the safety release valve. good luck and hope this helps, normally the reciever dryer has to be replaced and the orifice tube but you might get lucky. And follow the direction I gave you exactly, if you see the pressure build to over 50 shutthe car off and unhook the hose anddo not attempt to charge it, it can blow the can up if the pressure gets to high. Good Luck.

Get an a/c charging kit, it comes with a can of freon usually with a blue hose, and a small guage on it. The type is R134a.
Under the hood look for the a/c pipes, one has a red cap which is the high pressure, and the other has a blue cap,( that can be anywhere), that's the you need. Unscrew the cap, screw the blue hose on to the pipe, DO NOT TURN CAN UPSIDE DOWN. Start engine, turn on a/c full blast, open valve on can. Shake once in a while. When can is empty disconnect. If no other problems with system, there should be cool air coming out.

You need to add the freon on the low side which is usually indicated by a blue cap. The red cap is the high side port. Never add freon using the high side port. Typically if you are buying a guage set from your local auto parts store, it will only attach to the low side service port because they are diffent types of connections. Another easy way to tell is to turn your AC on and feel the lines that the ports are attached to. The low side should be cold/cool and the high side will be hot.

did you add freon to your system if so how much try letting some out.

whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch