Quote:
Originally Posted by mcrews
First rule of thumb (imho) NEVER SUFFER!!!!!!!!!
as a general rule, when its's on low or high, it's on. I let mine get my car as cold as fast as it can. the I adjust the therosate (I have a digital screen) to 74 or what ever and forget it.
I have run tests on the highway at 60 mph. A/c on window up. then a/c off windows down. in a 99 vaden plaus jag and an 2002 infiniti Q45. both lost 3-4 mpgs with the windows down.
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But you still had the AC belt on when you were not using the unit. If you take the whole unit out, the situation changes, since the parasitic draw on the engine from the off AC is gone. For me, I installed dark, metalized, heat reflective tint. My windows are never more than cracked on the freeway. I run the fan full blast.