diagnosing a blocked radiator??

[Bob Kneale]

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Before you get too focussed on the possible faults in the radiator department consider that if the passages in the cylinder head are clogged up over years of use in hard water districts, that area in the top of the engine can cause major overheating headaches until the obstructions are cleared out. A suitable drill bit is all you need. It's happened to me on more than one head, and its a quick job to rectify, and check each time you have the head off.
Hope this helps
Bob