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Question: If you bypass the heatercore, warm up, then turn on the heat, would the cold coolant entering back into the engine cause any potential harm? I know it's not a lot of fluid and it will probably warm up quickly, but isn't metal not a big fan of a quick cool down, even in small doses like that? I don't think it would crack a block or warp a head by any means, but is it possible that, with enough uses, it could cause some potential long-term damage?
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