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How do you unclog a radiator so the water will come out without taking it to a shop?


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Wiki User
2015-07-15 19:23:22
2015-07-15 19:23:22

I'm not really sure what you mean but if you need to drain it and the tap on the bottom is stuck, undo the clamp on the lower hose and drain it into a pan. If you meant the core is clogged, you are pretty much out of luck. Try an autoparts store for radiator cleaning solution or mix 50/50 water and CLR. Do not leave this mix in there long because antifreeze is what lubricates the water pump and you will eventually burn it up by running anything else but antifreeze.

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just take the shroud off to give you a little bit of room to work leave the radiator in

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no. instead use arm and hammer washing soda diluted with hot water

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stuck thermostat or a air bubble in the system. Or the lower radiator hose is plugged or collapsed.

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When there is no water in the radiator, a car can overheat. Serious damage can occur like a blown head gasket an warping if one drives for a long time without placing water in the radiator.

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That would depend what is clogging them


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