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post #4 of (permalink) Old 7th March 2013
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Re: clio 02 dci

Thermoplunger unit. I was stumped myself for a while by the same thing. The thermoplunger is an electric heater thing that helps warm up the coolant quicker. You'd think it wouldn't make a noise, but it is probably caused by localised boiling of the water as it passes over the heating elements.
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