Hi , I have a GU with the 2.8 diesel that is overheating when the engine starts to work . It has just had the head replaced after the usual timing belt failure .No probs prior to that . Also got a new radiator , water pump , thermostat , caps and had the timing checked by diesel electrics as it was overheating after this work was carried out. This went fine for approx 200km after this work was done and then coming out of Brisbane to Toowoomba it started overheating AGAIN , had to get towed up the range . Nissan seems to think maybe the block needs machining which is a major job . I am lost and had a gutfull of it as this vehicle has been out of action for 4 months . Any ideas or info if someone has had a similar experience would be much appreciated .