Ian Baxter
Hello Paul,
Only a stab in the dark 
But does this engine have a plastic thermostat housing ?
If so check it hasn't broken internally and the stat plunger has nothing to push against 
Ian
Message Thread 
VW Golf 1.6 TDi CAYC 2009 - Overheats when driven - Fixed # - Paul Chard February 18, 2017, 12:13 pm
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on February 18, 2017, 10:10 pm, in reply to "