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Old 11-18-2012, 01:13 PM   #2368
Commander Keen
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
2012 Impreza 4DR 5MT


If the thermostat is working correctly the engine should stay at operating temperature without any problem.
The thermostat is working fine, but blowing cold air over the heater core can cool down a warmed up engine, or prevent an idling engine from ever fully warming up.

If you have a scan tool, see for yourself. The blue light going out only indicates 120F.

If it's 50% (and that will be determined by the aerodynamics of the vehicle) and density is increased by 10%, you can expect your fuel consumption to increase by 5%, all other things being equal.
Aero losses increase exponentially with speed so that percentage will change with speed as well. Your 50% figure is true of most cars doing 25 MPH and rises with speed.
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