Replacing a GTI radiator — after a stone's punctured it, a plastic end-tank has cracked, or corrosion has blocked it — is a satisfying DIY. It's mostly about draining, disconnecting, and getting the front end apart for access. Do it cold, plan the refill and bleed, and it's a couple of hours. See Overheating Diagnosis for working out whether the radiator's actually the cause
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