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A radiator has no moving parts. It's only job is to dissipate the heat of combustion in your engine. If it doesn't do that job, it's bad. One of the most insidious faults a radiator can have is rust and corrosion build up inside the radiator. This keeps the fluid from circulating. Many times, this cannot be seen. A corroded radiator is a bad radiator. A leaky radiator is a bad radiator; it can't hold the fluid. A radiator with a majority of the cooling fins bent so that air can't pass through is a bad radiator; it can't cool the fluid. One of the tests they do on radiators is to pump them up with air and listen for whistling leaks. Sometimes, they submerge them in a bath to see if any bubbles form, and if they form, where they're coming from. If bubbles do form, it is a bad radiator.

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Q: How do you tell if radiator is bad?
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