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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.
He says if you drive your car around and then park it in the garage, it won't get as cold as if you kept it outside. Henein: When you stop the engine, the engine is hot. It takes a long time for the internal components of the engine to cool down.It can take up to 8 or to 12 hours. That's because there's no wind to carry the heat away. So even if it feels cold in your garage, the engine may still be warm.e says if you drive your car around and then park it in the garage, it won't get as cold as if you kept it outside. Henein: When you stop the engine, the engine is hot. It takes a long time for the internal components of the engine to cool down.