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Will putting a piece of cardboard in front of your radiator help the heater get warmer faster in your car?

and if it does can i leave it on or do i have to take it off when it gets warm enough

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Yes but that will be risky since it will prevent cooling which will cause over heating. You will have bigger problems when your car is not cooling as much as it should and it will cost you more money fixing it.

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Yea but it could start a fire

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This is typically done in cold climates during winter when the air temp around the engine is sufficient to keep it cool. If you do this and engine starts to overheat, remove the cardboard. It works, just keep an eye on your temp gauge

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