[JaxChris]

Keep the RPM above 4k and you'll feel that the compressor is disengaged. If you go WOT from any speed above 0mph the compressor also disengages.

[GT-ER]

Originally Posted by TrekGTO

Pulse width modulation is the internal clutch, which is how they have 0 output with no external clutch. Having done VW service for 35yrs this function is the leading cause for replacement. Car comes in with 0 compressor function at any rpm. I have yet to see a compressor with no clutch function but I am 2 yrs behind. SS Sedan has pulse width modulation and an external clutch.

Dude, it doesn't have a clutch. It never disengages the wobble plate. The internals will always be moving, even at 5% displacement (can't go to 0). The pistons never stop moving. Sanden, Zexel, Denso, etc. All have compressors like these and yes, some even have both a clutch AND variable displacement. But some do not have a clutch.

[ProCharger]

Originally Posted by GT-ER

Dude, it doesn't have a clutch. It never disengages the wobble plate. The internals will always be moving, even at 5% displacement (can't go to 0). The pistons never stop moving. Sanden, Zexel, Denso, etc. All have compressors like these and yes, some even have both a clutch AND variable displacement. But some do not have a clutch.

Ya, same as Mercedes and many others. Its basically always on in some fashion...if not for cooling, for dehumidification

[Gen6 softtop]

Little off topic also but seen RPM Dyno a Vette with AC and with out same engine temps also AC only used 10 hp guessing the new AC is pretty efficient