Focus Fanatics - View Single Post - Engine warmed up, then went cold.
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Old 02-03-2013, 01:37 AM   #5
thejordan
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Join Date: Dec 2012
Fan#: 107706
Location: Southern, CA
What I Drive: 2013 SGM Focus 5 Speed

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Thermostats open when hitting a certain temperature (150-180F for most cars), and fans kick on and off as well, which all act to cool the engine, especially at idle. Running the heater acts as an additional source for heat removal so the thermostat doesn't have to open as often.
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