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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
If youâre not going to be driving that often, just idling the car will do your battery more harm than good, Brown-Harrison says. âStarting the engine draws 100 to 130 amps, and idling the car for 15 minutes might put back three or four amps,â Brown-Harrison says.