Quote:
Originally Posted by bradze
does driving with the climate controls set to defrost have anything to do with the AC system and lower gas mileage?
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To continue with what redpoint said, yes the defrost usually runs the AC compressor. I just found out that my Focus is auto AC when selecting defrost, but also found out that there is a plug on the selector knob that can be unplugged and deactivate that feature. Usually the dry air isn't completely needed and her car should still have an AC switch that can activate the compressor for the initial clearing. I've never run the AC on defrost on my other cars and never thought I needed it to perform better.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
