Except this is one of those variable compressors that does not have a normal 
clutch. So the hub is spinning all the time regardless of the AC being on or 
not. 

Sent from my iPhone

> On Jul 25, 2022, at 6:20 PM, Jim Cathey <jim.cathey...@gmail.com> wrote:
> 
> Pretty sure you can always tell if the compressor hub is spinning, vs not.
> Pistons gotta pis, so if they're moving so is fluid.  If it won't build 
> pressure
> either the one-way valves or shot, or the expansion valve is so open that
> no pressure is built.
> 
> At its heart, AC is extremely simple, mechanically.  Worst case is a variable
> displacement pump, which adds that failure point to the mix.
> 
> -- Jim
> 


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