I have a Discovery 3 - 2007 (2.7 Diesel) - and in September 2016 suffered the dreaded 'Catastrophic Engine Failure'. Around 1 year after timing belts / tensioners were replaced the cam belt tensioner broke away from the mountings on the oil pump and good-night - it was all over ! Land Rover stood up to the plate and provided a brand new engine, including fitting at a main dealer - so no issues there.
We had a few small ****les following the new engine being fitted, but a few trips back to the shop and they all seemed to be resolved.
However - about 3 weeks after the engine was fitted I got a Coolant Low warning. It was a bit low, so I topped up and assumed that this was a settling-in issue after the new engine. It happened again, and again - numerous times with the warning coming on and off. The dealer suspected the sensor in the coolant reservoir, so changed it for a new one. Same problem....
The vehicle was in and out of the shop a few times, but as it wasn't a major issue I continued on. Then - one day the engine temp shot up and I had to stop, release some air from the reservoir and top up with around 3 litres of water ! This made me think again and back into the shop it went. They have exhausted all avenues of investigation - and even tried putting some rad-weld in in case there is a small leak somewhere they couldn't find.
We are now 17 months down the road and I still have the problem.

Anyone seen this type of problem.....

Andy.

 

They need to pressure test the system and find the leak. Its not hard

 

Try the pommy forums, no TDV6's in US of A. Also try the Aussie forum AULRO.

 

They have done 2 pressure tests and these both proved inconclusive......