Question about 2001 Toyota Corolla
You can drive with the switch on or off, it doesn't matter. Most vehicles default to the "on" position every time the engine is started, I'm not sure if yours does. The reason you can select the O/D off is because in some driving conditions the transmission will shift in and out of overdrive several times and it gets a little annoying. These conditions could be while driving up a grade at freeway speeds or driving at close to normal speeds but in heavy traffic. Every time the transmission shifts, it generates a little heat. Normally that heat is dissapated through the cooling system, but if the transmission keeps shifting in and out of overdrive, expecially in heavy traffic or climbing a grade, the cooling system may have a hard time keeping up. If you feel the transmission shifting in and out of overdrive more than usual, and you're in an abnormal traffic condition, go ahead and turn the O/D off. Just remember to turn it back on again when traffic returns to normal so you can get the best fuel mileage.
Posted on Nov 22, 2010
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