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Old 07-16-2011, 10:58 AM   #8 (permalink)
Joenavy85
Making Ecomods a G thing
 
Join Date: Jan 2011
Location: Illinois
Posts: 655

Angie - '08 Infiniti G35 X
90 day: 22.03 mpg (US)
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Quote:
Originally Posted by camopaint0707 View Post
So is it more fuel efficient to turn on the AC full blast to cool the car then turn it off and then back on when it's hot again or to just leave it one a lower setting to keep the car at a constant cool?
All depends on the system design. My Jeep's AC system has a pressure switch that turns the compressor on/off as needed. Some old AC systems keep the compressor on all the time the AC is on and have a recirc valve that bleeds excess pressure to the inlet side of the compressor to keep the pressure constant.

What I do is when I start driving I blast the AC with the Fan on 4, until the temp is where I want it, then I slow the fan down to 2, and adjust the hot/cold dial to where it keeps the temp constant.
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