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Old 03-08-2011, 04:58 PM   #21 (permalink)
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GreenTurtle (Retired) - '01 Toyota Echo Sedan
90 day: 44.85 mpg (US)

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Could it be that cooling is less efficient when going up a hill, due to gravity ? Ideally, the water pump should be able to easily pump the coolant through the radiator, but on a hill, it might be pumping less for the same amount of pumping work.

Just a thought.

Definitely give the upper grille block a try.

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