The defrost setting on the Corolla runs the AC and this kicks on the fan every thirty seconds or so. I avoid this setting unless you need it as it sucks about 3 mpg off my mileage.
Mine runs at 1 tick below halfway too, and my scanguage tells me the Water temperature is 184 degrees. Perfectly fine.
The defrost setting on the Corolla runs the AC and this kicks on the fan every thirty seconds or so. I avoid this setting unless you need it as it sucks about 3 mpg off my mileage.
What do you mean by "defrost setting" and how it can possibly ran A/C (since A/C is for cooling, not heating, right?) and how do you avoid it?
What do you mean by "defrost setting" and how it can possibly ran A/C (since A/C is for cooling, not heating, right?) and how do you avoid it?
Many, if not most cars (including the Corolla) do engage the A/C while in Defrost. The idea is that warm DRY air works the best in defrosting the windshield. Hence the A/C runs to dry the air and the heater warms it up. it's really not that uncommon and works great. But as others have posted, it cuts into your mileage.
It's not too hard to disable though and provides you the driver the ability to make that decision. The method to do so has been posted here and other forums if you are interested.
Last edited by thecase; 11-18-2009 at 08:54 PM.
Reason: typo.
I spent a while searching for a solution for corolla on forums, but got pretty much nothing. Could anyone please point me to a solution on how to decouple A/C from defrost? I also stumbled upon someone mentioning CBEST (or C-BEST) options -- is re-programming of A/C behavior possible by a dealer?
Thanks... Ekhm... This looks like it's way beyond my skills, though. Can anyone maybe just describe the combinations of controls that are "safe/good" an those that are "not safe/evil" so I can just avoid them, please?
I'm getting embarrassing mileage out of my corolla right now... around 9L/100km and I suspect this a/c thing contributing to it -- always running defrost + low + max heat.
To keep the AC from kicking on, don't keep the airflow controls on the two rightmost settings on the dial unless you have a fogged windshield.
Can you be more specific?
Are you talking about the left dial and its two rightmost positions?
What about the heat level (right dial), does it matter?
What about setting blower to none (middle dial, leftmost position)? Does it do the job?
Are you talking about the left dial and its two rightmost positions?
Yes. The left dial (mode selection), in the defrost mode or in the defrost/floor mode, the air conditioning compressor runs.
Quote:
Originally Posted by mbaranov
What about the heat level (right dial), does it matter?
The temperature selection doesn't matter. Cold or hot, the compressor runs in either of the two defrost modes.
Quote:
Originally Posted by mbaranov
What about setting blower to none (middle dial, leftmost position)? Does it do the job?
That would be the one exception. Turning the blower to off turns the whole system off. So yes, running with the blower off will keep the compressor from running.
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Thanks!
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