Vauxhall Insignia Funny noise when I turn engine off

2011 Vauxhall Insignia Problem

CarVauxhall Insignia 2.0 turbo diesel
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When I turn the engine off above the radiator is a small unit with three pipes two rubber one metal it go's tick tick tick then it sounds like a ships horn sort ov noise I think it may hav something to do with aircon any know wats up would like to know thanks
Problem Category
Engine, Cooling System & Drivetrain

Electrics, ECU, Warnings & Lights

Leaks & Noises, Interior and Bodywork

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