I'm not sure but I believe that is the way the newer Toyota HVAC systems work. The older GMC Harrison HVAC systems did not cylcle the compressor but worked very well. Regards

 

Can anyone else verify this?!

 

On my older 02, the AC needs to be manually turned off at the controls if "auto" is used. Otherwise its always "on". I hate that.

 

i can check on my v6 tomorrow.Might be a different part but same company so i think it would be the same operation/design.

 

Shoot a quick video of the operation while someone switches the A/C on and off.

I doubt it's stuck on. If it did it would overcool the A/C and freeze the lines. Also you wouldn't have a noticeable on and off cycle.

 

I wouldn't call it a "noticable on/off cycle". The compressor works when the AC is on and the heat works when you switch to heat, but it appears that the clutch plate never releases. It spins even when the AC is turned off. I've tried removing the connector with the car running and the plate still doesn't appear to release.

 

The A/C seems to cycle on and off properly within the cabin. If it weren't for possible increased fuel consumption, extra drag on the motor, and possible premature component failure I wouldn't even be concerned with it.

A video would help. I have a 2009 Camry I4 I could instantly verify your operation against.

With A/C button on and the temperature control moved to Heat the A/C compressor still cycles to remove moisture from the air.

As an example in Defrost mode the A/C compressor is always on and the air always on fresh regardless of the button selection, temperature selection, or if you depress the recirculate button. This is to ensure moisture doesn't build up on the windshield from the vents.

 

@0:00 climate controls set to heat (vent and floor) with AC button "Off"

@0:16 Went into the car to turn AC button "On" (engine did sound like it had more of a load on it after pressing the button)

@0:26 Back outside the car under the hood to show compressor with AC button "On".

@0:48 Went back into the car to turn the AC button "Off"

@0:57 Back out to the front to show compressor with AC button "Off" again

 

Completely normal verified by my car.

Also I just remembered that when these cars came out there was literature about the Variable Geometry Compressor which required a special ND-12 compressor oil.

 

This?

Variable displacement vane compressor
US 4966531 A
ABSTRACT
A variable displacement vane compressor for an air conditioning system used in an automobile has a cylinder assembly having a bore which receives a rotor to form at least one crescent or compressing chamber between the rotor and the bore. The crescent chamber receives a refrigerant which is returned from the air conditioning system. The rotor has vanes which are extendably fitted therein so that the free end of the vanes are in contact with the circumferential inner surface of the bore during the rotation of the rotor, whereby when the vane passes through the crescent chamber, the refrigerant received therein can be compressed. The amount of the refrigerant introduced into the crescent chamber is adjustable in response to a change of a cooling load at the air conditioning system.


Also, according to this article Toyota has been using these in their Camry's since the late 80s and on Celicas in the 90s models... Wow! I guess you learn something new every day!

 

This is what I'm used to seeing. Notice how the center of the compressor stops spinning as the clutch releases? If the video was closer to the compressor you would also be able to see a gap between the compressor pulley and the clutch plate as the magnets release (you may still be able to if you look closely... I can see it). The gap opening and closing is pretty obvious in person.

 

 

hi can u help me
I have same issue
I install new compressor with out sensor
Now it’s operate when i turn the a/c on
But the compressor dose not release

 

 

With the engine off, look to see if there is a small gap between drive and driven plate front plates.

 

Maybe the sensor for the evaporator has failed. That is the component that drops the clutch when evaporator temperature approaches about 34/38 F. This protection is there to prevent the evaporator from freezing over.