A/C Clutch Compressor question

[tmontague]

Thanks for your reply. The clutch definitely moves back when the A/C ECU is turned off. It seems however that the clutch is not turning the compressor on. My next step will be to test the pressure of the system and make sure it is adequate enough so that the reason isn't low pressure disallowing the compressor to engage.

As a side note, when looking at my 08 Yaris' clutch today I noticed that there is a blue thin disc that spins all the time. It's in the area where on my gf's echo where it wouldn't move unless the clutch engages. You can't tell when the compressor is engaged or not. Is there any way to tell when the compressor is on or off on this car or do I have to go underneath and get a closer look?

[CTScott]

Originally Posted by tmontague

Thanks for your reply. The clutch definitely moves back when the A/C ECU is turned off. It seems however that the clutch is not turning the compressor on. My next step will be to test the pressure of the system and make sure it is adequate enough so that the reason isn't low pressure disallowing the compressor to engage.

As a side note, when looking at my 08 Yaris' clutch today I noticed that there is a blue thin disc that spins all the time. It's in the area where on my gf's echo where it wouldn't move unless the clutch engages. You can't tell when the compressor is engaged or not. Is there any way to tell when the compressor is on or off on this car or do I have to go underneath and get a closer look?

Typically to tell if it is engaging you either have to measure the pressure or spin it by hand and then power the clutch and spin it again. That is tough to do on the car though, as you would have to loosen the belt when doing so.