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Q: When it is cold,say below 40, the transmission will not shift into overdrive on 2007 Chevrolet Malibu

for about three miles on the highway. Is this a sign of low tranny fluid? I tried to check that but the designers of this car made that kinda hard to do.
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Is the engine reaching proper operating temp. before you are on the highway? Normally cars won't go into overdrive until warmed up past a specific temp. , If your thermostat is opening to soon causing an extended warm-up , that may be delaying the shift. Maybe it would also be good to have the fluid level checked, by a shop , if needed.
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