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I have the same problem right now, and from what I can figure, it looks like an intermittent thermal protector switch on top of the AC compressor. My 2003 Civic air conditioning works fine for 20 minutes or so and then stops working. If this switch is faulty, the compressor clutch won't engage and you won`t get cold air. I will get it replaced soon, but it seems like the access is not easy.
Probably, to be sure make sure the compressor is coming on. With the engine running turn on the ac and watch the rpms, they should drop for a second if the compressor is coming on. If so you just need to recharge, the refrigerant is R-134a, which you can get from your local parts store along with the kit needed to charge it. The kit will come with detailed instructions and is a pretty easy job.
I would recommend changing the whole compressor,rarely do I replace clutches anymore to much time and trouble and most likely the compressor is worn out anyway,but if you want to tackle it you will need a clutch tool to remove and install and you will need shims.
yikes. You chose to describe the most expensive part of the a/c system. Looks like you need a new a/c clutch which comes on a new compressor. A recovery recycling machine can evacuate the system and allow one to replace the a/c compressor.
there are several things that can cause your trouble ...but the most likely is that it is simply low on R134A refregerant .. when the internal pressure gets too low there is a "low pressure" switch that turns off the compressor clutch.. thats to prevent it from sucking in air that can harm the air conditioner .. .. there must always be something like 20-30 pounds of pressure before the compressor clutch is allowed to operate ..if its right on the borderline then you might get it to go by flicking the clutch (thats not a safe thing to do) ... the R134a only costs about $10 and you can get a gage to attach to the can that allows you to get about the right amount into the system .. since your system seems to be right on the edge then it likely wont need more than one can of R134a .. two at the most .. more than that can overpresure the system and damage a hose .. as you fill the unit you watch the gage with the engine running .. air on .full blast and set cold.. as it fills the pressure will get high enought to engage the clutch .. yoiu will see the pressure slowly increase .. you can put the R134 can in a pan of warm water to make it empty faster (dont turn the can upside down) .. .. stop filling when the pressure gets to the recommended value .. that may be stamped somewhere under the hood or in the owners manual ... about 34 pounds seems like an average .. but that varies depending on how hot it is outside ... hot makes it a little higher .. cool makes it lower .. if the low side pressure is ok but the clutch still wont operate ..then you could have a bad clutch relay or low pressure sending unit ... or the clutch itself could be damaged .. sometimes the wire connection to the clutch goes bad .. but 95 percent of the time its just low refrigerant ..
half can is low, possible cause is that fill port is clogged happens when u put sealer in sometimes, but it sounds like your system is under charged check pressure, if no reading port is clogged change port, low reading add freon,
I have a 2002 Jeep Liberty and after driving for about 30 minutes the air conditioner would start to blow hot air. The air conditioner clutch was sticking. I could hit the clutch and it would kick in and start to work. I went to Advance Auto and purchased a big spray can of electric motor cleaner and a big spray can of WD-40. I soaked the clutch with the electric motor cleaner, used the whole can, then soaked it with half a can of WD-40. The clutch has worked perfecty ever since.