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Should you shift an automatic transmission from 'D' to 'N' while waiting at traffic lights?
Wiki User
Answered 2005-09-22 05:51:18
No. It shouldn't be necessary and it puts strain on the linkage to shift constantly like that - the whole idea of an automatic transmission is to eliminate the need to shift gears. The transmission has a fluid clutch that is designed to allow for maximum slippage at idle speeds so that the engine very nearly freewheels when stopped. You may want to put the transmission in 'N' in hot weather. The torque converter creates heat from the viscous resistance of the fluid. This extra heat can be reduced by going in to 'N', but I wouldn't do it unless it was a very hot day and you have had problems with you car overheating. The elimination of this extra heat could be crucial on a hot day when your car has the greatest load on its cooling system.
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