You can try to tighten the valve, if you have the tool. I don't know if a tire shrader valve tool will fit an R134a low side port. I'm looking into that currently & getting my tools up to speed If you lost too much refrigerant (not Freon) that is a Dupont name from decades ago, then you may have to have a vacuum pulled, leak checked & recharged. You can buy those caps with no problem almost anywhere
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Thats pretty high if the system is not running. Average pressure on the low and high side should be near outside air temp. Normal low side is 30-40 psi and high side is 200-250 psi when the system is running and the freon charge is full.
When self adding freon after it leaks out you get air trapped in the system. After adding freon a couple of times the air expands not leaving room for the needed freon. To continue adding freon with air tapped will knock the compressor out pretty quickly, there's not enough room for both & the air is keeping the freon from being able to cool properly give the false indication of being low on freon. The freon you are adding has the dye added to assist in finding the leak since freon does not evaporate nor dissipate it its being leaked out. A black light will assist locating the leak. The best thing is to have the unit checked & serviced by a mechanic...he'll charge about $ 150.00 to check for leaks, remove the old freon...his machine will tell him how much air its trapped in the system by how little freon is removed. For the service fee he will replace valves & gaskets, where needed, correcting most leaks. After sucking the system down & recharging the problem should be corrected.
Freon does not evaporate nor dissipate. If you're low on freon there's a leak. If it is low by 50% or more you will end up with air pockets in the system & air will keep the system from cooling correctly & dramatically shorten the life of the compressor. A local mechanic will check the system for leaks, remove the existing freon, examine the fittings, expansion valves & seals, replacing worn ones, **** the system down & recharge it...the going price for this service is $ 150.00 compared to $ 1000.00 up to replace the unit, if you make a mistake trying it yourself.
You need to check the freon level and if that is good check the compressor. If you have no pressure on the low side, when I say pressure on low side I mean vacuum, then most likely the compressor is bad or you have a leak someplace. You can get a freon fill kit at Walmart, Target, Auto Zone and most any auto parts stores. These kits comes with a gauge and connection hose. Typically if the freon is low the compressor won't activate. Connect the fill hose to the low Side of your AC and turn the AC on to Maximum with the engine running. If its a low freon problem the compressor will start to kick in as the pressure increases. Make sure you don't overfill the system as this will cause a seal or line to blow. Being a 1998 your vehicle should use R134A freon which is what can legally be purchased by a home mechanic. It cost about $12 to $20 a can and usually includes a leak detector additive and seal conditioner.
It is the same as with any other car. The freon must be added through the low side service port. If the freon is low, it means that there is a leak. It is recommended that you find and fix the leak before charging the system with more freon that will just leak back out.
If you can follow the a/c lines look for 2 valves, may have black or different colored caps on them. The small one is the low pressure port. If you are looking at recharging your ac system make sure that you have the a/c turned on full blast when you go to add the freon. Also pay attention to your a/c clutch. if it is clicking on and off for short periods at a rapid rate you definately need freon. You may also want to get freon with stop leak and leak detector added already so you can check for leak (in case you hadn't already thought of that)
Sounds like the A/C system just needs to be recharged. When was the last time you had this done? Just take it in to your mechanic and he can do it for you and if that's not it for some reason, then he will be able to find the problem but most likely you need more freon added.