Is auto-temp control good, or a waste of money?

[z12358]

MNBoxster:
"But, I think we can all assume that running the AC Top DOWN on a warm day will have it operating at, or near, 100%."

It has been my understanding that the non-temp-control (standard) AC doesn't care about what the ambient temp is. There's no feedback loop informing the AC how hot it is in the cabin. I just set it manually how cold I want it to blow. So, yes, if I set it to "coldest" it WILL work at 100%; if I set it to the middle of the range it will blow at 50% -- regardless of top up or down. Am I wrong?

Z.

[MNBoxster]

Originally Posted by z12358

MNBoxster:
"But, I think we can all assume that running the AC Top DOWN on a warm day will have it operating at, or near, 100%."

It has been my understanding that the non-temp-control (standard) AC doesn't care about what the ambient temp is. There's no feedback loop informing the AC how hot it is in the cabin. I just set it manually how cold I want it to blow. So, yes, if I set it to "coldest" it WILL work at 100%; if I set it to the middle of the range it will blow at 50% -- regardless of top up or down. Am I wrong?

Z.

Hi,

I cannot say for sure on the Manual 987 unit. But I am talking about the Compressor, not the Fan speed. The Manual 987 has most of the data available (from various sensors) to regulate some compressor load, but, it may not have the processor (in the Climate Control unit) to do so. It may simply not be as variable (have the same 5%-100% range) as the Auto Climate Control, but I suspect that there is some, something like the AC and AC MAX settings on older cars..

With the emphasis today on reduced emissions, increased range (MPG), and maximized performance, I cannot imagine Porsche de-evolving the design. But, who knows...??

Happy Motoring!... Jim'99