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Most likely the system has pressure in it discharged
If the cluch spins the compresser will not work with out enough pressure to make the low pressure valve open .The compressers them selves are pressed together and then to leak .Look for green dye around the middle of the compresser.
Air conditioning is one area where the owner generally is not qualified or equipped to perform the necessary repairs. If you are overheating and the ac isn't cooling I would check the condenser (radiator in front of the engine radiator) and made sure it's not obstructed. Also make sure that the electric fan comes on when you engage the A/C. Beyond that there isn't much you really can do except have an professional run a diagnostics on the system.
The low pressure switch is located on the accumulator, and you only need to remove the connector to the low pressure switch and jumper the wire connector to by-pass the low pressure switch, however I would not recommend doing so because it is there to keep the AC compressor from being damaged due to running it low on R-134a.
If you are trying to charge the AC system you do not need to by-pass the low pressure switch, just start the vehicle and turn the AC on to maximum, then charge the AC system and when there is enough pressure in the system the compressor will come on, and then just continue to fully charge the AC system.
check the space between the ports, it is common to have both fittings on the same line if and only if the orifice tube is located between them because thats what seperates the low pressure side from the high pressure side, the high pressure side will be warm to hot when the a/c is running, once the hot liquid hits the orifice tube it turns into a cool vapor, so if you feel one side is hot and one side is cool then the orifice tube is whats between them and it is true that the low and high pressure sides can be on the same line.
hi there sorry to hear about your air conditioning. if you ac is not running you are probally low on Freeon wich you can add your self since this is a 134-A system. all you need to do is go to your local parts store or walmart and get a can or 2 of the 134a and hook it up to you ac system and charge it. the can will tell you exactly how to do it. But first check your fuse pannel out and see if you have a A/C fuse listed.
hope this helps you.
please rate me and by the way the 134-a is only around $8 usd a can.
The AC charge port is the on low pressure AC line (large line from compressor) near the firewall. Take care not to overcharge, there are other causes of no cooling like a stuck AC compressor cycling switch or a air temp control blend door motor malfunction, what is the issue u have? does the AC compressor run?