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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.
Your car is overheating when idle because there may be a lack of  oil or water in the engine. It can also be a problem with the  engine itself. If your car is overheating, s â¦ imply contact a wrecker  or a road assistance company. The police are also available to  assist you.