A/C blowing warm randomly issues

[jjs316]

Here lately, my a/c has been getting worse and worse by randomly blowing warm air. I believe it's is the compressor, but I'll see what others have to say about it.

Problem: A/C will randomly get warm. It first started that it would just be warm during idle and then when the RPMs increase, it would get colder. Now it will get warm even driving at highway speeds (3k+ RPMs). It is also an Intermittent Problem. Some days it will be fine all day long (even during few hour long trips) and other days, it will be warm within 5 miles of driving and never cool down until the car is shut off for awhile (for instance, while I'm in a store or something). The compressor is kicking on like it should while the A/C is on and running.

I have had it hooked to an A/C machine a few times. The first time I pulled all the Refrigerant out and filled it up to recommended levels. Also checked to see it holds vacuum and it does so I don't think it is leaking. The next time I checked a few months later, the Refrigerant level wasn't any lower so I don't believe a refrigerant leak is my issue.

I read on a recent post that someone had my beginning issue (warm air at idle until the RPMs were up) and they had replaced the compressor and that seemed to fix their issue.

Anyone have any other ideas before I purchase a compressor?

[98outbackpdx]

check my post for the a/c compressor and look of ouch 1011 post

[jjs316]

Are the a/c compressors the same from the 2.5l and the 2.2l of the same model years (BD)?

[Magoozle]

Possibly the thermistor starting to fail. Though they usually work 100% of the time or not at all.

[mycargoesvroom]

I might be reaching, but if the car is over heating at all it will warm up the A/C pretty quick. My car had a small leak in the lower hose and if it started to get warm the A/C would too.

[httrdd]

Could be a thermistor or could also be your compressor. The compressor may be switching off on temperature overload. Not sure how you can check a compressor in a car. When I do residential compressors I do am amp reading to see if it is overworking itself.

[Magoozle]

Also, I know you said you checked it already but possibly too much of a charge in the system? See what pressures you have, if you have too much of a charge when you run your a/c the low side and high side pressure will rise as opposed to the high side going up and low side going down causing an increase in temperature.