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Can you please elaborate on "turn on". Do you have air moving out of vents its just warm? Does the A/C light come on and blink? Does the Display for the A/C turn on at all?
Ok let me do a little investigating into this system, Ill be back soon.....
I see you said no A/C light, when you push the A/C button a little light comes on on the button, when the light is on the system is operating normally, if the light starts to flash it means there is a problem with the system. Please confirm that this light comes on when the A/C button is pressed, and let me know what happens to the light when it stops working.
Ok, and there is no clutch on this system, what you see turning is a pulley. It uses whats called a swash plate compressor which does not need a clutch to run. Just letting you know this is normal to always spin.
Has there ever been any work do to the A/C system? or has vehicle ever been in an accident that may have caused the A/C system to be opened?
2006 Avalon with 2grfe engine? right?
My apologies I had the wrong repair manual open when I was looking at the compressor. Yes it does have a clutch.
If the A/C does truly stop working,but the clutch is still engaged the A/C light should start to blink when this happens.
Try this attached diagnostic procedure an see if you can receive any information from this.
Yes let me see if i can find more detailed instructions.......
So you tried pressing Auto and Recirc button at the same time then turn key on with holding those two buttons down? and nothing happens?