I will be surprised if its the rad as the normal reason for tdi rads to fail is the fins rot off from the outside.
Brainwave has just occurred, are you fitting the correct 200 tdi stat as when the stat opens it also shuts off the bypass hose so forcing all the coolant through the rad, a std stat will not do this.
This is the kiddy http://www.ebay.co.uk/itm/Bearmach-...747?pt=LH_DefaultDomain_3&hash=item3aac388a53
Brainwave has just occurred, are you fitting the correct 200 tdi stat as when the stat opens it also shuts off the bypass hose so forcing all the coolant through the rad, a std stat will not do this.
This is the kiddy http://www.ebay.co.uk/itm/Bearmach-...747?pt=LH_DefaultDomain_3&hash=item3aac388a53
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