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05-22-2013, 11:34 PM
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#19 |
 Drives: 2010 Yaris S HB Join Date: Nov 2011
Location: Texas
Posts: 33
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The reason the A/C runs when you turn the defrost on is to dehydrate the air you're blasting at the inside of the windshield. It makes the defroster more effective.
The reason the Prius engineers went to the lengths of putting the thermos bottle in was because the engine doesn't run all the time, and running the PTC (Positive Temperature Coefficient) heater (an electric coil like on a space heater) uses quite a bit of current, and in that car, that reduces the electric-only driving range. |
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