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Old 3rd August 2021, 08:34   #22
biffa75
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Mk1 2004 tourer cdti + MK1 2003 Saloon CDT

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If it is the original thermostat (depending on how bad the leak is) if you can take it for a drive using the onboard diagnostics to show the coolant temp as you drive. If It does run at the constant higher temp I would then be inspecting the thermostat as Simon states, it can be down to just the o ring. With the thermostat removed, block off some of the ports and put some water in it and duct tape a bicycle pump and block any other ports off etc and apply a little bit pressure using the pump and see if the seam does leak. If it doesn't.. you could.just replace the o ring.

If it has broken at the welded seam... Order up a new one but as I and others have found. New thermostats for the kv6 open at a lower temp and run at lower temperatures. I have been reassured that this won't cause any issues if you do have to replace it. It doesn't appear to matter where you order one from either the results are the same wether they are sourced through x-part agents or not.
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