Why do radiators gurgle?


Quick Answer

The gurgling sounds that emanate from radiators actually come from air bubbles within the coolant reservoir. These sounds are not normal, and they usually indicate a problem with the engine coolant system - most commonly a broken, cracked or disconnected hose.

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Why do radiators gurgle?
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Full Answer

Releasing the air by 'bleeding' the radiator may provide a temporary fix, but a broken hose in the coolant system must be repaired as soon as possible. The gurgling noise is a result of the engine overheating and, if it persists, it eventually causes the thermostat to fail. Less commonly, gurgling noises may result from a broken thermostat. In this case, repair is more costly.

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