Quote:
HH56 wrote:
[quote]The cars that are on the road today {in the USA} have a compressor clutch that cycles on until the pressure switch is satisfied, then freewheels until needed again.
This is pretty much the way things have been since at least the early 90's and maybe even earlier. Lower end aftermarket systems used the clutch as soon as compressors became available with robust more heavy duty units but factory system cars up until the change did the constant on-reheat the cold air-style temp control. IMHO, that is a superior system as there is no humidity change as happens when the clutch drops out and suddenly thawing moist air is blasted into the car.
Mostly because of fuel economy numbers and trying to squeeze the last drop for the fleet averages, most US companies almost overnight adopted the cycling clutch. I am sure cost of components had something to do with it as well since the clutch system is much simpler with no POA or assorted similar temp control valves and plumbing to worry about.
HH and ATMWOO, thanks for the explanation. My ignorance bucket is less full now. Appreciate it.
(o{I}o)
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