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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.
14. It depends on the engine but there is a potential for low oil pressure at idle which, even though there is a low engine speed, can cause damage if left to it's own devices for long enough. There is also an issue of engine heat. In an excessively cold environment, this may not be a problem.