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The charging port is located in the larger of the two hoses/lines that come from the AC compressor, the fill port will accept only the right fitting from the charging source hose fitting. Before you add refrigerant you need to locate the leak, the refrigerant doesn't just disappear, it leaks out somewhere.. My guess would be the AC compressor front seal.
When you say you checked the pressure did you connect gauges to the high and low sides to get both pressures, this sounds like it may be low. also what is the temp coming out of the vents. note on really hot days and humid the ac system doesnt cool as good unless the truck is moving down the road or highway and does take a while to cool down. at a stop or sitting or in traffic the ac temp will rise as the condensor needs to be cooled like the engine does, if its not cooling then the temp will not be cold, check the front of condensor for blockage, also make sure the fan is running with ac on. this fan should run when ac compressor is on,maybe clean condensor with water hose blowing from radiator outwardto front bumper, then make sure the hot/cold blend door is closing all the way,a quick test is to turn a/c on, turn temp control to hot and see if it gets hotter then back to cold and it should get colder. this sounds like the system may just be a little low. have an a/c tech check it, you may find its low or nothing is wrong. good day.
You won't have the training/knowledge or equipment to work on a refrigerant system.
So you have to go to a shop that does, and won't pollute the atmosphere with refrigerant.
What caused the compressor to sieze up is the question. The entire system will have to be flushed, one component at a time,in case the compressor sent trash up stream.
Need you plastic for this job.$1500 min.
you are supposed to hook up the guages then run the compressor, unless you have a different model than most. this method will give you the low pressure side reading as the compressor runs, this is the important one. as all systems are different there will be slightly different pressures at rest
I would check the following possibilities: 1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.
2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.
Could be other issues, but I would start with these.
The engine drive belt operates the AC compressor. The OUTER pulley on the compressor , where the belt is, is always turning when the engine is running. When the AC is turned on, a CLUTCH on the compressor is engaged and connects the outer pulley to the compressor shaft. So, when the compressor is actually working, the outer pulley AND the inner ring just behind the outer pulley are both turning. When the AC is off (or not working correctly, as in your case), only the outer pulley turns.
It sounds like there is a major leak somewhere in the system. If you want to try and to find the leak yourself, there is a product in auto parts stores that is made for this. It is a canister, like the refrigerant used to charge the system, that will blow out a dye in the system, where the leak is. This can help you identify where the leak is ....If this info was helpful, please post... Thanks...
If the compressor is not coming on, the compressor clutch may be bad, or it may have disconnected at the power connector. There is a plug that attaches to the compressor that engages and disengages the clutch-check to see if it is plugged in. It may also be a bad compressor too. Looks like your compressor should cost less than $200 for the part on Ebay, not sure about labor-they'll probably have to drain the system of refrigerant, replace the part, and fill it back up again
. I'm having the same problem with my car at the moment and I'm pretty sure the compressor is at fault. Hope this helps.