Does your AC work harder when you drive faster?

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285
Location
nyc
Since the AC Compressor is driven by the engine via the serpentine belt--does it follow that it works HARDER (however that's defined) when the engine flywheel spins faster? I suspect the answer is NO because it probably has some kind of self-regulating mechanism or whatever. Just curious.
 
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11,141
Location
Florida, Cape Coral
I think the faster the compressor run the more work is being performed up to the maximum compressor capacity. . Variable displacement AC compressor? The compressor speed is tied directly to engine speed. On some types of units ther is a variable valve that contolls the amount of freon circulating if that is what you mean by variable displacement.
 
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12,385
Location
Northern CA
 Originally Posted By: Eddie
Variable displacement AC compressor? The compressor speed is tied directly to engine speed.
They exist, they vary the swash plate angle to vary the piston stroke. I think they are long ways from universal on the market but I haven't been paying much attention to AC the past few years. I remember thinking over 30 years ago that they should use variable angle swash plates, but fuel economy wasn't as important then.
 
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19,479
Location
Chicago Area
AC compresssors work better at mid speeds than idle. They like to be turning at a decent rate. This is how you check and fill them. The AC on most cars cycles, nowadays. This cycling should offset any high speed losses, to some extent.
 
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